Colour Blindness

Do you think your colour blind? Do you find it difficult telling if colours are red and green, or blue or yellow? Do other people sometimes tell you that the colour you think you are seeing is wrong?

If so, these may be signs that you have a colour deficiency, which can be called colour blindness.

What is Colour Blindness?

Colour blindness is actually an incorrect phrase, as it is not a form of blindness at all. Rather, colour blindness is a deficiency in the way you perceive colours. With this problem, you have difficulty seeing colours such as red and green or blue and yellow.

Red-green colour deficiency is the more common type. It affects about 2-6% of all males. It is very rare in females.

Blue-yellow colour deficiency is very rare, but affects both males and females equally.

People who are colour blind don’t necessarily see the world in shades of grey. They are able to see a full range of colours, but certain colours appear very different or appear less pronounced than what a person with normal colour vision would see.

If you suddenly develop a colour vision problem where you could previously see a wide range of colours, you should consult your optometrist or ophthalmologist. This could be due to other underlying health problems.

Colour Blindness Test Video

Causes of Colour Blindness


Colour blindness occurs when light sensitive cell in the retina (called cones) fail to respond appropriately to certain wavelengths of light that allow us to see colour. There might be a deficiency in these cones or a complete lack of them. This is normally inherited, so most people with colour blindness are born with it.

Parkinson’s Disease

It is a neurological disease so light sensitive cells may be damaged and results in colour blindness.


The lens becomes cloudy causing hazy vision and colours appear less bright. Cataract surgery will normally restore colour vision in this case.

Tiagabine for Epilepsy

This medication has been known to reduce colour vision, but its effects are not permanent.


Retinal cells can be affected as we age, decreasing our colour vision.


An injury to the back of the head could also result in colour blindness.

Treatment for Colour Blindness

Unfortunately, there is currently no cure for colour blindness.

Gene therapy has been successful in curing colour blindness in monkeys, but this has not been proven to be safe in humans as yet.

Most people who are colour blind adapt quite well but others have their career choices slightly limited. If you had to consider a career as a graphic designer or an electrician, you would be required to have very good colour vision.

If you become aware of your colour blindness at an early age, you can plan and train for your profession that does not require you to have a full range of colours.

Diagnosing colour vision problems early in life may also prevent learning problems as a lot of learning material at a younger age is dependant on colour perception. If your child is colour blind, the teacher needs to be aware of the problem so he/she can plan the lessons accordingly.

For adults, you can always work around your colour vision problems, like organizing your clothes in a certain order or labeling them to prevent colour clashes. Wearing 2 different coloured socks can be quite embarrassing. So get someone to help you.

Make sure you visit your optometrist or ophthalmologist if you need more advice on colour vision or if you’ve noticed problems in your children.

Leave a reply
    Why Does My Eye Twitch?

    Eye twitching or eyelid spasms are quite a common occurrence. Your eye twitch usually occurs only on the bottom eyelid, but sometimes the upper eyelid can also twitch. Most eyelid twitches come and go. Sometimes your eye twitch may last for weeks and sometimes months.

    Today we will look at the question “why does my eye twitch” and help explain to you the causes of eye twitching, when it is serious and when it is not, and some of remedies for your eye twitch.

    Eye Twitch

    Causes of Eye Twitching

    These eye twitch muscle contractions can be caused by:

    1. Stress
    2. Tiredness
    3. Eye strain
    4. Caffeine
    5. Alcohol
    6. Dry eyes
    7. Nutritional imbalances
    8. Allergies

    Almost all forms of eyelid twitching are not serious but they are difficult to treat. The only form of eyelid twitching treatment is to figure out what causes the twitching and deal with it.

    More serious forms of eyelid twitching are caused by neurological conditions like:

    • Blepharospasms or,
    • Hemifacial spasm.

    These are less common and should be treated by an eye specialist.

    Why Does My Eye Twitch?

    Eye Twitch Videos


    Stress: we are all under stress at times and our bodies react differently to stress. Eye twitching can be one of the signs of stress, especially if related to vision problems like eyestrain. Reducing the eyestrain can cause the twitching to stop.

    Tiredness: a lack of sleep can trigger eye twitching. Catching up on some sleep can help.

    Eyestrain: Vision related stress can occur if you need glasses or need a change in your glasses. Your eyes may be working too hard to give you comfortable vision and this will trigger eye twitching. Computer eyestrain is a very common cause of vision related stress.

    If the eye twitching is persistent and irritating you should have an eye exam, because you may need vision correction. If you spend a lot of time in front of the computer, your optometrist may prescribe special computer glasses.

    Caffeine and Alcohol: Research has shown that increased alcohol and caffeine consumption can trigger eye twitches. So, if your alcohol or caffeine (tea, coffee, cold drinks) consumption has increased, try to cut down.

    Dry Eyes: Dry eyes are very common among the older population. Dry eyes are also common among computer uses, people taking certain medications (antidepressants, antihistamines), contact lens wearers and people drinking a lot of alcohol and/or caffeine. If you are tired and under stress, you may also get dry eyes. This can all lead to eye twitching. It is best to see an optometrist for dry eye evaluation as there are a lot of treatment options available.

    Nutritional Imbalances: Some studies have shown that a lack of certain nutritional substances like magnesium can trigger eyelid twitching. However there is no scientific evidence of this. So always consult your doctor before adding magnesium supplements to your diet.

    Allergies: Eye allergies result in itching, swelling and tearing. Rubbing the eyes, causes the release of histamine into the lid tissues and tears. It has been shown that histamine can cause eye twitching. Some doctors recommend antihistamines for eyelid twitching. However antihistamines can cause dry eyes. So it’s best to consult with your eye doctor for the best treatment for your eyes.

    Eye Twitching Remedies

    Most  of the time time is the remedy needed with eye twitches going away on their own.

    In rare cases the eye twitching just does not go away. Some of these can be treated with botox injections which will stop the muscle contractions.

    Always see your optometrist or ophthalmologist immediately if the twitching affects half your face or the entire eye, causing the lids to clamp shut.

    Leave a reply