STUPID QUESTION

WHAT CAUSES COLOUR BLINDNESS?

Patricia O’Connor, optometrist at Maverick and Wolf Opticians, says ‘Most colour-blind people inherit it through a genetic fault, usually passed from mother to son. The mother will often be unaffected, as just a carrier of the faulty gene. The condition occurs because some of the coloursensitive cells in the eyes, called cones, are missing or don’t function properly because of the fault.’