Every human is different, and each can have varying colour vision deficits.

In this image you can see that if you have colour vision deficit, it depends entirely on its type and severity. It is not the same for each person.

There are different types of colour blindness, including red-green, blue-yellow, and complete colour blindness. If you have red-green colour blindness, you’ll generally have more colour vision understanding than if you had a blue-yellow deficit.

  • Severe colour vision loss happens when all three cone cells are absent.
  • Mild colour blindness happens when all three cone cells are present and one cone cell does not work correctly.

The most common type is red-green colour vision loss, affecting 8 per cent of males and up to 0.4 per cent of females. It is called deuteranomaly which occurs when the M-cones (medium wavelength cones) of the eye are present but dysfunctional. It causes green to look redder, which makes it difficult to differentiate between shades of red and green.

Protanomaly happens when the eye’s L-cones (long wavelength cones) are present but dysfunctional. It causes red to look greener.

Protanopia occurs when the L-cones of the eye are missing. Missing M-cones are responsible for deuteranopia. Both conditions cause trouble differentiating between red and green.

Blue-yellow colour blindness is less common than red-green, though red-green colour blindness can often accompany it. With this type of colour blindness, you have trouble differentiating between blue and green and between yellow and red.

Tritanomaly occurs when the eye’s S-cones (short wavelength cones) are present but dysfunctional. If you have tritanomaly, blue and green will look alike, and red and yellow will look alike.

Tritanopia occurs when the S-cones of the eye are missing, which causes colours to look dampened. It also makes it difficult to differentiate between colours with attributes of blue and yellow, such as green, purple, red, and pink.

If you believe you have a colour vision deficiency click here to take our online test.

The next step is to purchase a testing kit, try the iRo Lenses for yourself, and see the difference they make to the colours around you.

Then head to our website to see the full range of qualified iRO Lens Optometrists who will give you a thorough eye exam and prescribe a pair of glasses with iRo Lenses for you.