Colour blindness results from

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(B) The human retina contains two types of photoreceptor cells: rods and cones. $1$. Rods are responsible for vision in dim light (scotopic vision) bu

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Absence of cones

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(B) The human retina contains two types of photoreceptor cells: rods and cones. $1$. Rods are responsible for vision in dim light (scotopic vision) but do not perceive colour. $2$. Cones are responsible for colour vision and fine detail in bright light (photopic vision). $3$. Colour blindness is a genetic condition caused by the absence or dysfunction of specific types of cone cells in the retina,which prevents the individual from distinguishing between certain colours. Therefore,the correct option is $B$.

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