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Colour Blindness

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What is it?

Causes

Symptoms And Complications

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Treatment and Preventions

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What is Colour Blindness?

Colour blindness, also called colour vision deficiency, is a condition where the eyes have trouble distinguishing certain colours. Most affected people have either red or green colour blindness. Blue colour blindness and monochromatism, a condition in which a person sees only black, white, and grey, are very rare.

Most people have mild forms of colour blindness that don't interfere much with their daily lives. 8% of Caucasian men and less than 1% of Caucasian women have either red or green colour blindness. This condition is rare among people of Asian, Hispanic, Indigenous, or African descent. Colour blindness is divided between inherited and acquired kinds.

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What causes Colour Blindness?

The area at the back of the eye, called the Retin A, is sensitive to light and colour. It contains specialized cells, called cones, which respond to colour. There are three types of cone cells. One responds best to red light, one to green light, and one to blue light. When a specific type of cone cell is missing or doesn't work properly, a person will have trouble seeing the colour that particular cone cell responds to. For example, a person with red colour blindness has a defect in red cone cells.

Most colour blindness is inherited, although some cases are caused by an injury or disease of the retina or optic nerve, the nerve that takes visual information from the eye to the brain. People inherit colour blindness as a result of a defect on the gene(s) for colour located on the X chromosome.

Men inherit colour blindness 10 times as often as women do. Colour blindness "shows up" in men because they have only one X chromosome. Since women inherit two X chromosomes, a healthy gene on one X chromosome can override the unhealthy gene on the other. A woman can still have the unhealthy gene; it just doesn't always show up. She can, however, pass the gene to her children. A person who doesn't have a genetic condition like colour blindness but who can pass it to her children is called a "carrier."

Diseases that may lead to colour blindness include Glaucoma, Macular Degeneration, Cataracts, uncontrolled Diabetes, and Multiple Sclerosis. Fading color vision may also occur with age.

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Colour Blindness Symptoms And Complications

Colour blindness ranges from very mild to very severe forms, with most people having mild symptoms. People with colour blindness can't see the difference between certain colours. For example, a person with severe green colour blindness (deuteranopia) has trouble seeing the difference between oranges, greens, browns, and pale reds. In someone with severe red colour blindness (protanopia), all red colours look very dull.

A few people have trouble distinguishing blue. This condition, called tritanopia, is either inherited or is caused by a reaction to drugs or poisons that damage the retina or optic nerve. It can also be due to a loss of function in these two areas over time.

Most people don't know they have colour blindness until someone else notices they have trouble telling shades apart. For example, someone may notice the colour blind person has trouble matching colours.

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How to diagnose Colour Blindness

Tests for colour blindness are generally given to children and to people applying for jobs where colour discrimination is important, such as in the case of pilots, train engineers, or electricians.

Colour blindness is tested in daylight, using special coloured cards. A more complicated test uses an instrument called an anomaloscope. It shines a changing mixture of red and green light. The person is asked to change the mixture until it looks the same as a yellow light. The examiner can tell how severely colour blind a person is by looking at the redness or greenness of the adjusted mixture.

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Colour Blindness Treatment and Preventions

Inherited colour blindness is not treatable. In cases of acquired colour blindness, a doctor will treat the underlying disease or injury. People with mild colour blindness lead fairly normal lives. Severe colour blindness can interfere with tasks such as seeing traffic signals properly. Special eye glasses or contacts may be prescribed to adjust colour. People with severe colour blindness may not be able to perform tasks that require colour discrimination.


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Frequently asked questions

How to buy Colour Blindness medications online?

You can buy your medications to treat Colour Blindness online at PocketPills if you already have a valid prescription from your doctor. You can get started by uploading your prescription, ordering a refill by transferring any existing medications to our pharmacy or talking to one of our Canadian Doctors to get an online prescription. Get started now!

Can I get brand name Colour Blindness medications or chose to get generics?

Absolutely. You can always communicate your preference for brand or generic medications during your online consultation. As a policy, PocketPills advocates generic medications as more affordable and more likely to be covered by your insurance plan

Can I get a prescription on PocketPills for Colour Blindness?

Yes, our physicians can prescribe medications online during your consultation. Once you receive a prescription, you'll have the option to have it delivered to your door in discreet packaging and at no additional cost!. Click here to get an online prescription today!

References

All material © 1996-2021 MediResource Inc. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health providers with any questions you may have regarding a medical condition.

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