write the functions of the following
(a)optic nerves
(b)retina
(c)cornea
Answers
Answer:
a) The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II. It is the second of several pairs of cranial nerves. The job of the optic nerve is to transfer visual information from the retina to the vision centers of the brain via electrical impulses.
b) The retina is a thin layer of tissue that lines the back of the eye on the inside. It is located near the optic nerve. The purpose of the retina is to receive light that the lens has focused, convert the light into neural signals, and send these signals on to the brain for visual recognition.
c) The cornea acts as the eye's outermost lens. It functions like a window that controls and focuses the entry of light into the eye. The cornea contributes between 65- 75 percent of the eye's total focusing power. When light strikes the cornea, it bends--or refracts--the incoming light onto the lens.
hope this helps!
1. optic nerve - It convey the image formed on the retina to the brain.
2. Retina - It is delicate membrane having a large number of light-senstive cells called 'rods' & 'cones' which respond to the intensity of light and colour of objects respectively.
3. Cornea - It is the front of the eyes.The light coming from objects enters the eye through cornea.
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