Question

State the changes that occur in the following structures when the eye accommodates for near vision.

(a) Ciliary muscle

(b) Suspensory ligament

(c) Lens

Answer 1

Accommodation power:

1. The adjustment the eye does to concentrate on distant and close things clearly is referred to as eye accommodation power.
2. As a result of this characteristic, the eye can perceive objects clearly from a variety of distances.

(a) Ciliary muscles:

1. The lens is more convex or rounded during near vision because the ciliary muscles contract and compress the lens into a more convex shape.
2. Resulting in a reduced focal length.

(b) Suspensory ligaments:

1. The ciliary bodies serve as anchors for suspensory ligaments, which stretch the lens and change its refractive power.
2. The zonule relaxes, allowing accommodation for nearby items.

(c) Lens:

The ciliary bodies relax, the zonule stretches, and the lens flattens during far vision.