Draw a labeled diagram of human eye. Write the functions of Cornea, Iris, Pupil, eye lens and retina.
Answers
Iris is that part of the eye which controls the amount of light entering the eye through the pupil.
Pupil is a type of small hole through which light enters the eye.
The eye lens is a convex lens just behind the pupilwhich converges the light rays towards the ratina.
The retina is a type of screen in the eye having light sensitive cells where the formation of image takes place
Cornea This is the front part of the tough outer coat that is transparent. It refracts light (bends it as it enters the eyes to ensure it is in the right place).
Lens A transparent, biconvex, flexible disc behind the iris. Focuses the light onto the retina ( the light sensitive part of the eye),
Retina The lining of the back of the eye containing two types of photoreceptor cells - Rods (sensitive to dim light, black and white) and Cones (sensitive to colour). This detects the light in the way a film would in a camera.
Optic nerve A cranial nerve (from the brain) that carries impulses information from the eyes to the brain where it can be interpreted.
Pupil The pupil is essentially a hole in the center of your iris that controls how much light enters the eye. It's size is controlled by the relaxing and contracting of the iris. When there is high light intensity, the pupil shrinks while it grows in low light intensity. This is to ensure there is enough light for vision without damaging the sensitive retina.
