Eyelid Twitching: Symptoms, Causes and Treatment

You must have had one of those involuntary eyelid twitches that usually come and go on their own but which can be rather annoying when they keep happening days on end.

So what exactly are the twitches all about? What causes them and can they necessitate treatment?


Eyelid twitching normally occurs in the upper eyelid, though they can occur in the lower eyelid too.

For most people, the twitches are mild and feel like a gentle tug on the eyelid. Others experience a spasm strong enough that it forces you to close your eyelid completely. Yet others feel nothing much, as the twitches don’t have any noticeable signs.

Episodes of eyelid twitching—also known as blepharospasm—are unpredictable. The spasms typically occur every few seconds for a minute or two, but they can last anywhere from a few seconds to a few minutes to even even a few months depending on the cause of the twitch.

Most of the time, these twitches are painless and harmless and are just your body telling you that you have watched too much television or need a break from staring at your computer.


The obvious symptom is of course uncontrolled twitching of the eyelid. Other common symptoms are:

  • Squinting
  • Continuous blinking
  • Increased twitching while performing eye-intensive tasks such as stitching or reading.

Eyelid twitching may occur without any identifiable cause and because they are rarely a sign of a serious problem, the cause is not usually investigated. Nevertheless, eyelid twitches may be caused or made worse by:

  • Stress
  • Fatigue and lack of sleep
  • Eye-straining tasks, such as prolonged computer use, long episodes of sewing, extended television viewing, etc.
  • Corneal irritation or injury
  • Side effects of medication
  • High consumption of alcohol and caffeine, which make the eyes less hydrated, resulting in muscle spasms (eye twitches)

To Note: During pregnancy, it is common to undergo stress, fatigue and sleeplessness. These reasons might trigger eyelid twitching. Also, eye spasm during pregnancy can also be a result of deficiency in vitamins and minerals in the body, like potassium, calcium magnesium, vitamin D etc.

  • Schedule breaks: Be sure to get plenty of breaks away from your computer or television to help rest your eyes.
  • Rest and Relaxation: Simple rest and relaxation, including a good night’s sleep, often resolves most minor cases of eyelid twitching.
  • Massage: Appling warm compresses to the twitching eye and gently massage the eyelid with your fingers is a good remedy for an eyelid twitch.
  • Diet and exercise: A healthy diet and exercise will do you some good and help you reduce and even eliminate eyelid twitching.
  • Reduce or eliminate alcohol and caffeine: You may want to consider reducing or eliminating caffeine and or alcohol from your diet.
  • Botulinum (Botox) injections: This is sometimes used to treat eyelid twitching. Botox may ease severe spasms for a few months. However, as the effects of the injection wear off, you may need further injections.

To Note: The treatment that works varies depending on the person. If an underlying health condition is the cause, then treating the underlying condition is the way to relieve the twitching. 

When is an eyelid twitch a medical emergency?

Eyelid twitches are rarely serious enough to require emergency medical treatment. However, chronic eyelid spasms may be a symptom of a more serious brain or nervous system disorder, thus you may need to see your doctor if you’re experiencing this. You may need to see you doctor too if:

  • Your eye is red, swollen or has an unusual discharge.
  • Your upper eyelid is drooping.
  • Your eyelid completely closes each time your eyelids twitch.
  • The twitching continues for several weeks and begins to affect other parts of your face.

Do you have any queries regarding eyelid twitching or any other eye condition? Please place your query on the comment section below or contact us via: info@cityeyehospital.or.ke.

If you need medical attention, contact us via +254 (0) 707 777 707 or visit us at City Eye Hospital, Ngong Rd, Opposite Traffic Police Station, Nairobi, Kenya.

Stye symptoms and treatment

You must have come across someone with a stye mostly at school. Some students had sties routinely through school. Some would have 8-10 sties in a year.

A stye is an infection that causes a tender red lump on or along the edge of an eyelid. They may be painful or annoying, but they are rarely serious. Most go away on their own without treatment. Sometimes sties can form inside your eyelid as well.

Styes typically don’t cause vision problems.

What are the symptoms?

A stye usually starts as a red bump that looks like a pimple along the edge of the eyelid. The first signs are pain, redness, swelling and tenderness.

As the stye grows, the eyelid becomes swollen and painful. The eye may also water. Most styes swell for about three days before they break open and drain. Usually, they heal in about a week.

There are other eye issues that can accompany styes, such as frequent watering in the affected eye, increased light sensitivity and a feeling like something is in your eye (eye doctors call this a “foreign body sensation”).

How do you treat a stye?

Most times home remedies is all that is needed.

  • Apply warm, wet compresses for 5 to 10 minutes, 3 to 4 times a day. This usually helps the area heal faster. It may also help open a blocked pore so that it can drain and start to heal.
  • Let the stye open on its own. Don’t squeeze or open it.
  • Don’t wear eye makeup or contact lenses until the area has healed.

If a stye is not getting better with home treatment, see an ophthalmologist immediately. You may need a prescription for antibiotic eye ointment or eye drops.

Also, occasionally, a stye can cause conjunctivitis or inflammation of the eye covering. If an infection develops, urgent treatment will be needed as the infection can spread to surrounding tissue. In the majority of cases, though, a stye does not cause any problems.

How can you prevent styes?

  • Don’t rub your eyes. Continuous rubbing of the eyes can irritate your eyes and let in bacteria. If you need to touch your eyes, wash your hands first.
  • Protect your eyes from dust and air pollution when you can. For example, wear safety glasses when you do dusty chores like raking or mowing the lawn.
  • Replace eye makeup, especially mascara, at least every six months. Bacteria can grow in makeup.
  • Treat any inflammation or infection of the eyelid promptly.

Note: Usually, styes do not come back but some people seem to be more prone to them than others. Good hygiene, especially eye and hand hygiene can reduce the risk of them recurring.

If you have any queries regarding stye or any other eye condition, place your query on the comment section below or contact us via: info@cityeyehospital.or.ke.

If you need medical attention, contact us via +254 (0) 707 777 707 or visit us at City Eye Hospital, Ngong Rd, Opposite Traffic Police Station, Nairobi, Kenya.

Watering Eyes (Epiphora): Causes and Treatment

Watering eyes can develop at any age. It is, however, more common among young babies and adults over the age of 60 years. The condition may present symptoms in just one or both eyes.


Watering eyes occur if too many tears are produced or if they cannot drain away properly. Tearing is a normal function of the eye. Excessive tearing, or teary eyes that are not from normal crying, can be a sign of an underlying health condition or disease.

Tears, which are made up of water, oil and antibodies, are produced by the lacrimal gland. They drain from the eye through the tear ducts (lacrimal ducts).

If the tear ducts become blocked, tears can well up in the eye resulting in watering eyes.

Tear ducts can become blocked due to infection and inflammation, both of which can also lead to excessive tear production. Irritated eyes may produce more tears than normal as the body tries to rinse the irritant away.

The following irritants can cause the over-production of tears:

  • Some chemicals fumes
  • Sliced onions
  • Inflammation of the edges of the eyelids (a condition known as blepharitis)
  • Blocked or narrowed tear ducts
  • Infective or allergic conjunctivitis (conjunctivitis is the infection or swelling of the outer membrane of the eyeball)
  • An injury to the eye, including a scratch
  • A tiny pebble or piece of dirt entering the eye
  • Trichiasis: Inward-growing eyelashes, often caused by marginal entropion, which is where the eyelid turns in at the edges towards the eye
  • Ectropion: The lower eyelid sagging away from the eye, making it difficult for tears to reach the drainage ducts

The kind of treatment a patient gets depends on the severity of the watery eyes and its cause. In mild cases, an eye doctor may recommend just watchful waiting, i.e., doing nothing and monitoring the patient’s progress.

In cases involving an inward-growing eyelash or some foreign object that is lodged in the eye, the eye doctor can remove the eyelash or foreign object without the patient having to go to theatre.

Other treatment options

Surgery: In case of blocked or narrowed tear ducts, surgery to create a new channel from the tear sac to the inside of the nose may be necessary to allow the tears to bypass the blocked part of the tear duct. This surgical procedure is known DCR (dacryocystorhinostomy).

In case of ectropion, the patient may need to undergo surgery in which the tendon that holds the outer eyelid in place is tightened.

Probing: If the drainage channels on the inside of the eye (canaliculi) are narrowed, but not entirely blocked, the doctor may use an ophthalmology instrument known as a probe to make them wider. An operation may be required if the canaliculi are completely blocked. 

If you have any queries regarding watering eyes or any other eye condition, place your query on the comment section below or contact us via: info@cityeyehospital.or.ke.

If you need medical attention, contact us via +254 (0) 707 777 707 or visit us at City Eye Hospital, Ngong Rd, Opposite Traffic Police Station, Nairobi, Kenya.

Fun eye facts (Part 2)

  1. You blink less often while reading or staring at a computer, hence why your eyes become tired more when doing both tasks.tired-eyes
  2. It’s impossible to sneeze with your eyes open.CEH OFFICAL EYE
  3. Eighty percent (80%) of vision impairment worldwide is curable.IMG-20160629-WA0000
  4. If you’re shortsighted, your eyeball is longer than normal; if you’re farsighted, it’s shorter.glasses-20994_1920
  5. Your eyelashes keep dirt out of your eyes.eyelash-copyRead Part 1: http://www.cityeyehospital.or.ke/blog/fascinating-eye-facts/5-fun-eye-facts/#comments

If you have any queries regarding the eye, please contact us via: info@cityeyehospital.or.ke.

If you need medical attention, contact us via +254 (0) 707 777 707 or visit us at City Eye Hospital, Ngong Rd, Opposite Traffic Police Station, Nairobi, Kenya.

Know key parts of your eye and their functions

You must have drawn the eye at some point in your science class. Most people were at ease with the diagram, but for some, it raised hell. Just like the diagram, the eye is one of the complex parts of the body. There are several physical and chemical elements that make up the eye.

The eye is heavily involved with the nervous system, which allows the brain to take in information from the eyes and make the appropriate decisions on how to act upon this information.

The nerves must be kept in prime condition or the brain may start to receive false images, or you will not take in enough information to get an accurate perception of your environment.

Here are the key parts of the eye and their functions
  • Cornea: The cornea is the outer covering of the eye. It is convex and transparent. Its main function is to refract light – bends it as it enters the eye.
  • Pupil: It appears as a black dot in the middle of the eye. This black area is actually a hole that takes in light so the eye can focus on the objects in front of it.
  • Iris: The iris is the area of the eye that contains the pigment which gives the eye its color. This area surrounds the pupil. It uses the dilator pupillae muscles to widen or close the pupil, which allows the eye to take in more or less light depending on how bright it is around you. If it is too bright, the iris will shrink the pupil so that they eye can focus more effectively.
  • Conjunctiva Glands: These are layers of mucus which help keep the outside of the eye moist. If the eye dries out it can become itchy and painful. It can also become more open to damage or infection. If the conjunctiva glands become infected the patient will develop “pink eye.”
  • Lacrimal Glands: These glands are located on the outer corner of each eye. They produce tears which help moisten the eye when it becomes dry, and flush out particles which irritate the eye. As tears flush out potentially dangerous irritants, it becomes easier to focus properly.
  • Lens: The lens is composed of transparent, flexible tissue and is located directly behind the iris and the pupil. It is the second part of your eye, after the cornea, that helps to focus light and images on your retina.
  • Retina: The light focused by the lens will be transmitted onto the retina. This is made of rods and cones arranged in layers, which will transmit light into chemicals and electrical pulses.
    The retina is located in the back of the eye, and is connected to the optic nerves that will transmit the images the eye sees to the brain so they can be interpreted.
    The back of the retina, known as the macula, will help interpret the details of the object the eye is working to interpret. The center of the macula, known as the fova will increase the detail of these images to a perceivable point.

If you have any queries regarding the eye, please contact us via: info@cityeyehospital.or.ke.

If you need medical attention, contact us via +254 (0) 707 777 707 or visit us at City Eye Hospital, Ngong Rd, Opposite Traffic Police Station, Nairobi, Kenya.

Lasik Surgery: Is it right for you?

LASIK is a refractive surgery that corrects common vision problems like nearsightedness, astigmatism and farsightedness.

LASIK surgery is performed by an ophthalmologist by creating a flap in the cornea and then uses a laser to reshape the cornea and correct refractive error problems in the eye.

When is LASIK surgery a good choice?

LASIK surgery is most appropriate for people, who have a moderate degree of refractive error causing:

  • Nearsightedness (myopia), in which you see nearby objects clearly, but distant objects are blurry
  • Farsightedness (hyperopia), in which you can see far objects clearly, but nearby objects are blurry
  • Astigmatism, which causes overall blurry vision

A good surgical outcome depends on careful evaluation of your eyes before the surgery.

What are the risks of LASIK surgery?

As with any surgery, LASIK surgery carries risks, such as:

  • Undercorrection, overcorrection or new or additional astigmatism: If the laser removes too little or too much tissue from your eye, you won’t get the clearer vision you wanted. Similarly, uneven tissue removal can result in astigmatism.
  • Vision disturbances:After surgery, you may have difficulty seeing at night. You might notice glare, halos around bright lights or double vision.
  • Dry eyes: LASIK surgery causes a temporary decrease in tear production. As your eyes heal, they may feel unusually dry. Even after healing, you may experience an increase in dry eye.

What other circumstances make LASIK surgery a poor choice?

You might also rethink having LASIK surgery if:

  • Severe nearsightedness: If you’re nearsighted and have been diagnosed with a high refractive error, the possible benefits of LASIK surgery may not justify the risks.
  • Fairly good vision:If you see well enough to need contacts or glasses only part of the time, improvement from the surgery may not be worth the risks.
  • Active participant in contact sports:If you regularly receive blows to the face and eyes, such as during martial arts or boxing, LASIK surgery may not be a good choice for you.
  • Cost: Most insurance plans don’t cover the cost of vision-correction surgery.

FAQs on LASIK surgery

  • Can LASIK fix astigmatism?

Yes, in most cases, LASIK can fully correct astigmatism and the effect is permanent. Astigmatism is a very common vision problem however it is not an eye disease. It’s simply a refractive error like nearsightedness and farsightedness—it can be corrected with eyeglasses, contact lenses and LASIK surgery. Astigmatism typically is caused by the front surface of the eye (cornea) having an asymmetrical shape.

  • Is LASIK surgery performed on both eyes the same day?

In nearly all cases, LASIK is performed on both eyes on the same day at the same appointment time. LASIK surgery is safe, and the procedure takes only about 10 minutes per eye.So usually, there is no reason to schedule separate surgical times for each eye. However, it can be arranged if you prefer to have LASIK surgery performed on each eye on separate days (generally a week or two apart). It’s important to know, however, that it may be uncomfortable having one eye corrected and the other eye uncorrected between surgery days.

  • Can I have LASIK surgery if I have thin corneas?

No, if you have unusually thin or irregularly shaped corneas or a very strong eyeglasses prescription that would require removal of significant corneal thickness to fully correct your vision, your LASIK surgeon may determine that you are not a good candidate for LASIK.

  • Can LASIK surgery make you go blind?

LASIK procedures have been performed with high levels of safety and effectiveness. It would be extremely unusual for anyone to go blind from LASIK, especially if you follow your surgeon’s instructions and attend all follow-up visits as directed.

That said, it’s important to remember that LASIK is surgery and thus, like with any surgical procedure, unexpected complications can occur. Most LASKI risks and complications are mild and can be managed successfully. Most frequently reported complications from LASIK surgery are dry eyes.

If you have any questions regarding Laser surgery, please feel free to contact us via info@cityeyehospital.org or +254 (0) 707 777 707.

If you need Laser surgery, an eye examination or any eye medical attention, you can visit us at City Eye Hospital, Ngong Road, Opposite Traffic Police, Nairobi, Kenya, and we will be happy to serve you.

Diabetes and your vision

Did you know that on November 14 every year the world marks World Diabetes day?

Did you also know that persons with diabetes are likely to develop diabetic eye disease?

Below, we touch on nine facts you need to know about diabetic eye disease.

  1. Diabetic eye disease comprises a group of eye conditions that affect people with diabetes. These conditions include diabetic retinopathy, diabetic macular edema (DME), cataract, and glaucoma.
  2. All forms of diabetic eye disease have the potential to cause severe vision loss and blindness.
  3. Diabetic retinopathy involves changes to retinal blood vessels that can cause them to bleed or leak fluid, distorting vision.
  4. Diabetic retinopathy is the most common cause of vision loss among people with diabetes and a leading cause of blindness among working-age adults.
  5. DME is a consequence of diabetic retinopathy that causes swelling in the area of the retina called the macula.
  6. Controlling diabetes—by taking medications as prescribed, staying physically active, and maintaining a healthy diet—can prevent or delay vision loss.
  7. Because diabetic retinopathy often goes unnoticed until vision loss occurs, people with diabetes should get a comprehensive dilated eye exam at least once a year.
  8. Early detection, timely treatment, and appropriate follow-up care of diabetic eye disease can protect against vision loss.
  9. Diabetic retinopathy can be treated with several therapies, used alone or in combination.

Mark World Diabetes Day

If you haven’t had your annual eye checkup yet, then take this opportunity to mark the World Diabetes Day by getting that eye checkup during the month of November.

Need a comprehensive eye exam?

We at City Eye Hospital are dedicated to providing comprehensive eye care services that prevent as well as ensure early detection and treatment of eye problems caused by diabetes.

We’re located along Ngong Road, opp. Traffic Police, Nairobi, Kenya. Visit us any day from Monday to Friday.

You can also talk to us on: +254 (0)707-777-707


Colour Blindness

Have you ever tried to point out something to someone with colour as the main point of reference and they couldn’t spot it? Oh well, they just be suffering from colour blindness.

Colour blindness can be frustrating and humiliating, especially for school going children and young adults.

Adults are able to develop hard skin and see the funny side of it when they misjudge furniture or the colour of the dress of their spouse, but there are certain situations that correct interpretation of colours can be critical: prime example being traffic lights.

So exactly what is this eye condition that is commonly talked about?


Colour blindness is the inability to tell apart the colours red, blue, green or a mixture of the three as a result of the absence of colour-sensitive pigment in the cone cells of the retina—the nerve layer at the back of the eye.


  • Being able to see some colours and not others—this is especially true if you can’t tell between reds and greens but you can see blue and yellow easily;
  • Inability to see shades or tones of the same colour;
  • Seeing only black, white and grey;
  • Sensitivity to bright colours or lights;
  • Reading issues with coloured pages or worksheets produced in colour;
  • Inability to see any colour.


The key cause of colour blindness is genetics, i.e., the condition is inherited at birth. Chronic eye diseases affecting the optic nerve and exposure to industrial or environmental chemicals have also been known to cause colour blindness.


Colour blindness is diagnosed by taking ishihara plates tests: All plates show a big circle consisting of many little colourful circles, which differ in colour and brightness, making it tough for a colour blind person to see the numbers or traces on the plates.


There is no way to prevent colour blindness.

There is no treatment/cure for hereditary colour vision deficiency. However, it is possible for you to learn to recognize colour by other means, e.g., telling colours apart by brightness or perception.

Quick facts about colour blindness

  • Police officers, firefighters and airplane pilots are required to have normal colour vision.
  • A whooping 99% of all colour blind people are not really colour blind but colour deficient, i.e., they can see most colours but have a difficulty differentiating between particular shades of reds and greens.
  • People who are totally colour blind—a condition known as achromatopsia or monochromacy can only see things as black and white or shades of grey.
  • Colour blindness is more prevelant among males than females.

If you have any queries regarding colour blindness or any other eye condition, place your query on the comment section below or contact us via: info@cityeyehospital.or.ke.

If you need medical attention, contact us via +254 (0) 707 777 707 or visit us at City Eye Hospital, Ngong Rd, Opposite Traffic Police Station, Nairobi, Kenya.

Who to see for your eye problem

You have an eye condition or concern. You need to choose an eye doctor. Who should you see between an optician, optometrist and ophthalmologist?

Opticians, optometrists and ophthalmologists all provide eye care services. It is important to understand what each is qualified to do.


Opticians are technicians who make, verify and deliver lenses, frames and other optical devices and/or contact lenses as prescribed.

An optician’s’ functions include:

  • Prescription analysis and interpretation;
  • Determining the lens best suited to the wearer’s needs;
  • Creating work orders for lab technicians to ensure delivery of the proper lenses;
  • Preparing and delivering work orders for the grinding of lenses and the construction of eye wear;
  • Verifying finished ophthalmic products;
  • Adjusting, replacing, repairing and reproducing previously-prepared ophthalmic lenses, frames and other ophthalmic devices.

NB: They do not assess, diagnose or treat eye conditions. They also cannot check or write prescriptions for eyeglasses or contact lenses.

What to expect when you visit an optician

The optician will:

  • Help you select eyeglass and lens treatments, including tints and coatings;
  • Take your frame and facial measurements to ensure your eyeglasses are a correct fit and are well positioned as well as adjust eyeglasses for you to ensure a proper fit;
  • Repair your broken frames;
  • Educate you on proper eyeglass and contact lens care;
  • Interpret optical prescriptions written by optometrists or ophthalmologists;
  • Give you advice on lens type, frames and styling.


An optometrist is a health service provider who is involved primarily with vision problems.

Optometrists are specifically educated and trained by an accredited optometry college in a four-year course, but have not attended medical school.

They are licensed to examine the eyes and to determine the presence of vision problems. Therefore, they can determine visual acuity, and prescribe spectacles, contact lenses and eye exercises.

Optometrists may perform all services listed under the definition of an optician.

What to expect when you visit an optometrist

An optometrist will undertake a comprehensive eye examination. A comprehensive adult eye and vision examination with an optometrist may include, but is not limited to, the following tests:

  • Patient history: The optometrist will ask about any eye or vision problems you are currently having and your general health. In addition, they will inquire about your patient history, which includes finding out when your eye or vision symptoms began, medications you are taking and any work-related or environmental conditions that may be affecting your vision. They will also ask about any previous eye or health conditions you have experienced.
  • Visual acuity: Visual acuity measurements evaluate how clearly each eye is seeing. Reading charts are often used to measure visual acuity. As part of the testing, you will read letters on charts at a distance and near.
  • Preliminary tests: An optometrist may first want to look at specific aspects of your visual function and eye health. Preliminary tests can include evaluations of depth perception, colour vision, eye muscle movements, peripheral or side vision and the way your pupils respond to light.
  • Keratometry: This test measures the curvature of the cornea (the clear outer surface of the eye) by focusing a circle of light on the cornea and measuring its reflection. This measurement is particularly critical in determining the proper fit for contact lenses.
  • Refraction: Refraction determines the lens power you need to compensate for any refractive error (nearsightedness, farsightedness or astigmatism). Your optometrist places a series of lenses in front of your eyes and then measures how these lenses focus light using a handheld, lighted instrument called a retinoscope. The lens power is then refined based on your input on the lenses that gives you the clearest vision.


An ophthalmologist is a medical doctor specialised in total eye care including diagnosis, management and treatment of eye diseases and injuries.

Ophthalmologists are trained to perform eye surgery and are licensed by a regulatory board. They are required to have continuous education on an ongoing basis to maintain their license and stay current with the latest standards of eye care.

An ophthalmologist’s’ functions include:

  • Patient examination: Ophthalmologists perform examinations and tests to determine the nature of the patient’s vision problem. They check for conditions such as macular degeneration, glaucoma and cataracts.
    If the condition can be rectified through corrective lenses or medications, ophthalmologists issue a prescription. Ophthalmologists also give pre- and post-operative care. They may examine patients with eye injuries to determine whether surgery is the best option.
  • Perform Surgery: If surgery is needed, ophthalmologists advise on the most appropriate surgical procedure for the patient and the precautions to take. In some cases, ophthalmologists must surgically remove tiny bits of debris lodged in the patient’s eye due to, for example, an accident. Tumors or growths on the ocular nerve may also be addressed by the surgeon.
  • Establish Treatment Plan: Ophthalmologists develop treatment plans for individual patients depending on the eye condition. It is important to seek care from an ophthalmologist specialised in treating your condition as they are highly trained and skilled in monitoring and giving you the care you need for the particular condition be it glaucomamacular degenerationcataracts or any other eye condition.
Key things to remember when visiting an optometrist or ophthalmologist 

Remember the following for your next optometrist or ophthalmologist visit:

  • Know your medical history and list of current medications;
  • Know your current symptoms and be able to describe them—write them down if necessary;
  • Know your family history, as some eye diseases are hereditary;
  • Bring your most recent prescription for glasses or contact lenses;
  • If undergoing a test using dilation eye drops, bring proper eye protection, like sunglasses, for after your appointment—it is also advisable that you bring someone to drive you home if you’re coming via personal means;
  • Ask in advance about your insurance, and if a co-pay will be due.

In conclusion

Eye health is the result of a working partnership between you and your eye healthcare provider. Ophthalmologists, optometrists, and opticians work collectively and with the patient to ensure good eye health and life-long vision.

If your eyes are healthy and don’t require specialised medical or surgical treatment, the type of eye doctor you choose for a routine eye exam is a matter of personal preference. Remember, you should visit your eye doctor for an eye exam at least once a year.

If you have any questions regarding how to select an eye doctor, please feel free to contact us via info@cityeyehospital.org or +254 (0) 707 777 707.

If you need to see an eye health provider for an eye checkup or for medical attention, you can visit us at City Eye Hospital, Ngong Road, Opposite Traffic Police, Nairobi, Kenya, and we will be happy to serve you.

Tinted versus polarized sunglasses

sunglassesYou’ve most probably experienced blinding reflections from the sun on a window or a brightly coloured sign board.

To protect one’s eyes from such blinding light is one of the reasons some people wear sunglasses. In this article, we touch on two types of sunglasses: tinted and polarized.

What is the difference?

Tinted sunglasses provide basic protection against vertical and horizontal UV rays. However, they don’t diminish the glare from reflected horizontal rays.

Polarized sunglasses on the other hand allow in the vertical component of light while eliminating the easily scattered and skewed horizontal component of light. They are therefore designed to reduce glare from surfaces such as water and glass. Glare distorts the true color of objects and makes them harder to distinguish.

Quick trick: Here’s a little trick you can perform to determine if lenses are polarized: hold two pairs of sunglasses that are labeled polarized. Hold them with one pair of glasses right in front of the other. Now turn one pair 90 degrees so the two pairs of sunglasses are perpendicular to each other. If the part where the two lenses are over each other becomes darkly opaque, almost completely black, you can be confident that they are both polarized lenses.

Pros and cons

Pros of tinted sunglasses

  • Good for general purposes, e.g., protective glasses
  • They come in variety of color or shades
  • Price friendly

Pros of polarized lenses                                 

  • Improves visual comfort
  • Improves contrast and visual clarity
  • Reduces eyestrain
  • Allows for true perception of colors
  • Reduces reflections and eliminates glare
  • Ideal for driving and certain sports

Cons of tinted sunglasses

  • They don’t eliminate glare

Cons of polarized sunglasses

  • They are more expensive than tinted sunglasses
  • The lenses come in grey and brown only

 Do you have any questions regarding the type of sunglasses or even eyeglasses to go for, please feel free to contact us via info@cityeyehospital.org or +254 (0) 707 777 707.

If you need to see an optometrist/ophthalmologist, you can visit us at City Eye Hospital, Ngong Road, Opposite Traffic Police, Nairobi, Kenya, and we will be happy to serve you.

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