Colour Vision Assessment

What is Colour Blindness?

Colour blindness refers to the inability to clearly see and distinguish colours clearly. If you are colour blind, you will you have difficulty distinguishing certain colours, such as red and blue or yellow and green. Even though this is a rare condition, it occurs among many individuals. Therefore, the only way to determine if you are colour blind is for you to do a colour-blind test. Often, some many signs and symptoms indicate this problem.

Symptoms of Colour Blindness

• The inability to clearly distinguish colours and different shades of the same.
• Others can easily notice a problem in the way you are dressed even when it seems ok with you; for example when you wear clothes that do not match.
• What appears normal colours to you is a problem for those around you.
• You are often unable to pick a pink or red item in green grass.
• You have trouble distinguishing street signs or traffic lights.

Early Symptoms of Colour Blindness in Children

• Using contrasting colours when painting, for example, red leaves on grass.
• Trouble when colouring in worksheets and denial when you talk about colour issues.
• Trouble identifying red in green colour items.
• Trouble identifying colour in low-level light.
• Excellent night vision, amazing sense of smell, smelling food when served before eating.
• High sensitivity to bright light, reading issues on coloured pages.
• Children often complain that their head hurts or the eyes are sore when looking on a background with green or red colour. They also love to count, sort games instead of painting if they are colour blind.

With these symptoms on telling if someone is colour blind, you can take appropriate measures to manage the condition.

Colour blind test, when to take it

If you often ask yourself, am I colour blind, it is imperative to take a colour-blind test. It is a test that opticians use to determine if you have a deficiency. Generally, there are two tests on how to tell if you’re colour blind, and they include screening tests and a more quantitative colour-blind test. The latter is more accurate as it determines the type of colour blindness you may have as well as its severity.

The Screening Test

Screening colour blindness test is also known as the Ishihara Colour Vision Test. The test was devised by Shinobu Ishihara, a Japanese Ophthalmologist, and it contains a circular pattern of dots with an array of colours, sizes, and brightness. The dots are random, which helps you to know if you’re colour blind. For a person with the deficiency, it will be hard to see a number in the patterned dots. The test comes with 38 plates, while those used in comprehensive tests come with 14 to 24 plates. The test is conducted by Dr. Janjua and only takes a few minutes.