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Answer.

Accommodation refers to the change in the shape of the lens in order to focus images.Rays from a distant object would be focused at a point behind the retina if the lens were not adjusted appropriately.

When the eye is focusing at a distant object, the cilliary muscles are relaxed and the suspensory ligament are stretched tight.The lens is pulled thin, thus allowing light rays from a distant object to be properly focused on to the retina.

When the eye is looking at near object, the ciliary muscles contract and the suspensory ligament become slack.The lens becomes more convex. This allows light rays from near object to be focused onto the retina.

 

 Refered Question.

NECTA 2010. BIOLOGY P 1.

Question 10 (a) i Define the term tropism

(i) State the biological importance of hydrotropism and phototropism

(b) How is a accommodation brought in the human eye?

 

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