Draw a labelled sketch of the human eye. Explain the function of the following
parts of the human eye-
(a) cornea
(b) iris
(c) pupil
(d) eye lens
(e) ciliary muscles
(f) retina
(g) optic nerves
Answers
Answer:
The outermost layer, known as the fibrous tunic, is composed of the cornea and sclera, which provide shape to the eye and support the deeper structures. The middle layer, known as the vascular tunic or uvea, consists of the choroid, ciliary body, pigmented epithelium and iris.
Answer:
a. Cornea: It is the front part of the eye. The light coming from objects enters the eye through cornea.
b. Iris: It controls the amount of light entering the eye.
c. Pupil: It controls the illumination in the eye.
d. Ciliary muscles: The focal length of the eye-lens can be changed by changing its shape by the action of ciliary muscles.
e. Eye-lens: It focuses light on to the retina.
f. Retina: It is a delicate membrane having a large number of light sensitive cells called 'rods' and 'cones' which respond to the intensity of light and colour of objects respectively.
g. Optic nerve: It conveys the image formedon the retina to the brain.
Explanation:
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