Solutions for colour vision deficiency


Enhancing colour vision

Colour vision deficiency (CVD), sometimes referred to as colour blindness, affects one out of every 12 men and one out of every 200 women. It is usually genetically inherited, but eye injury accidents and certain diseases also can result in a loss of colour recognition.


Occasionally, we see clients for visual stress who have also been diagnosed with CVD.  They have said that when they are wearing their Opticalm precision tinted lenses, they experience enhanced colour perception and colour discrimination in the colours they are able to see.  While this is not the condition that our process is designed to identify, it can be a fortunate side benefit of our lenses. Many individuals who struggle to overcome incorrect colour identification wear colour-tinted glasses or contacts. While these products do not solve the inherent deficiency, they provide a starker contrast between colours, which can help in proper identification.  


Colour vision deficiency occurs when individuals have difficulty distinguishing between colours and shades. The most common mix-up is between red and green. A more rare form of the condition is the difficulty distinguishing between blue and yellow. The ability to tell the difference between colours is directly related to how light or dark the shades are. In some cases, affected individuals will see no colour, or just shades of gray.



Since colour vision deficiency ranges from mild to extreme, it’s not uncommon for an individual to never know they live with the condition. Normally it is detected at a regular eye exam. The eye doctor holds up a testing plate and asks the patient to identify the correct numbers in a circle filled with colourful dots. The individuals may not see any numbers at all, or they may name the incorrect number. The Canadian Association of Optometrists recommends that every child receive a complete optometric examination, including a test for colour vision. Because many elementary-aged learning materials are based on colour identification, this is particularly important before they begin full-time schooling so adjustments can be made for affected children. 


If you wish to take a quick pre-screening for colour vision deficiency, please try the Enchroma colour blindness test. For a formal diagnosis, you should see your vision care professional and be given the complete test using all 24 plates of the test under controlled testing conditions and the proper lighting. 

Colour blindness plate_edited.png


While there is no cure for CVD, there are aids specifically designed to assist with increased colour perception. One of the most recent introductions into the market is Enchroma .  Their lenses are designed to enhance colour perception by filtering out the light into different spectral components. They have an indoor version, designed for looking at computer screens, and sunglasses for use outdoors.