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Colour blindness is caused by (a) dysfunctional:
  • A
    Fovea centralis.
  • B
    Cones.
  • C
    Rods.
  • D
    Cones and rods.

Colour Blindness

The ability to see colours comes from the cones of central vision. The normal impression of colour is generated by differential activation of three types of cone cells processing red, green and blue light. Each of these types of cells can be defective, resulting in a reduced capability to differentiate between colours, which is referred to as colour vision deficiency. The deficiency can be subtle and may then go unnoticed until specialized tests are conducted. Colour blindness is the absolute inability to see certain colours.

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