define the following :- Pupil, cornea, blind spot, iris,retina,braille system
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Pupil:-
It controls the amount of light entering into the eyes.
Cornea:-
Light enters into our eyes through the cornea.
Blind spot:-
Small portion of the visual field of each eye that corresponds to the position of the optic disk .
Iris:-
It contains the pupil at the centre and controls the size of the pupil.
Retina:-
Retina is that part of the eye where image of any object is formed.
Braille system:-
It is a tactile writing or reading system used by blinds. This system consists patterns and dots.
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