Cambridge O Level Biology · Syllabus 5090 · Coordination and Control
Accommodation
What is Accommodation?
The change in shape of the lens that allows the eye to focus a sharp image of a near or a distant object on the retina. For a near object the ciliary muscles contract, the suspensory ligaments slacken, the lens becomes thicker and refracts light more. For a distant object the ciliary muscles relax, the suspensory ligaments tighten, the lens becomes thinner and refracts light less. Accommodation does not change the size of the pupil.
This definition is part of the Coordination and Control chapter in Cambridge O Level Biology.
Questions students ask about Accommodation
What is accommodation?
Accommodation is the change in shape of the lens that focuses a sharp image of a near or distant object on the retina. For a near object the ciliary muscles contract, the suspensory ligaments slacken, and the lens becomes thicker and more convex, refracting light more. For a distant object the ciliary muscles relax, the suspensory ligaments tighten, and the lens becomes thinner and less convex, refracting light less. Accommodation does not change the size of the pupil.