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What are the rods and cones …

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What are the rods and cones in the retina of an eye

Posted by Aastha Kumari Kumari 3 years, 11 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 3 years, 11 months ago

Rods and Cones are the photoreceptors found in the eye, rods have rod-like structure and provide twilight vision, while cones are of the cone shape, fewer in number and provides the vision in the day or bright light.
Rods are found around the boundary of the retina, whereas cones are there in the centre of the retina.
Out of the 125 million photoreceptors, rods are about 120 million in the human eye and cones are 5 million photoreceptors.
The outer segment is cylindrical of rods which contain rhodopsin pigment, made up of Vitamin A, while the outer segment is conical of cones which contain iodopsin pigment.
Cones provide colour vision, which is of three types: red, blue and gree, whereas rods cells do not give colour vision, they do not have any differentiation.
Lack of the rhodopsin in the rods may cause night blindness, while lack of the iodopsin in the cones may cause colour blindness.
Rods provide the vision in the dull light (darkness or night), whereas cones are known to give the vision during the day or bright light.

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