Question

A central opening of iris is

• A. Cornea
• B. Lens
• C. Pupil
• D. Fovea centralis

Answer 1

Answer: (C)

Pupil

A. Cornea is the anterior portion of eye which absorbs oxygen from the air.

B. Lens is a transparent and crystalline structure present in eye which focusses the light rays to form an image on the retina.

C. Pupil is the aperture of eye or an opening in iris through which light enters the eye. The amount of light entering the eye is regulated by iris which changes the size of pupil.

D. Fovea centralis is the central pit of macula lutea which is a yellowish pigmented spot located laterally to the blind spot. Visual resolution is maximum at fovea as it has maximum number of cones (photoreceptor cells in retina which are associated with the daylight vision and colour vision).

So, the correct answer is 'Pupil'.