Question

In mammalian eye, the power of accommodation is controlled by changing the shape of the lens. It is governed by

• A. Cornea
• B. Pupil
• C. Iris
• D. Ciliary body

Answer 1

The correct option is D Ciliary body

The ciliary body is triangular in cross-section, and it encircles the inside of eye behind the coloured iris. It forms part of the middle uveal layer of the eye, that connects posteriorly with the choroid with the anteriorly with the iris. The ciliary body has two portions, the pars plicata at the front and the pars plana at the rear.
The ciliary body has two principal functions are;

• It produces and secretes aqueous humour essential to regulate the pressure within the eye.

• It contains muscles, that act on the crystalline lens via its zonular fibres, in concert with the elastic lens capsule, to change its shape and thus shift the focus of the eye from far to near.