Colour Blindness is a vision problem that is described as the inability to distinguish various colours such red, green, blue and a mix of the above colours. This condition develops in the eye cells that are located on the retina that is the rod and cone cells. The rod cells are sensitive to light and they help an individual to see well at night in shades of black, white or grey. These types of cells do not see different colours like the cone cells. Cone cells on the hand react to bright light and assist in the viewing of detail in objects.

Most colour blind individuals inherit the condition from their parents due to a defect on the gene for colour at the X chromosome. Individuals who develop Colour Blindness later in life obtain it due to eye injury or diseases that affect the optic nerve or the retina. Such eye diseases include: glaucoma, diabetic retinopathy, cataracts and macular degeneration.

A person with this vision problem exhibits the following signs and symptoms. They strain to distinguish colours, are unable to see various shades of the same colour and obtain rapid eye movement.
There are different types of Colour Blindness cases and they include the following: protanopia which arises due to the absence of red retinal photoreceptors; people with this condition are unable to identify red colour since red appears to them as dark colour. Deuteranopia-is a condition that is characterized as the inability to differentiate between red and green. Tritanopia that is the blue-yellow Colour Blindness is a rare condition; individuals who obtain it are unable to view the blue colour. This is due to the lack of blue retinal receptors.

Colour Blindness cannot be treated hence eye doctors manage it by prescribing their patients with coloured spectacle lenses or single red tinted contact lenses.