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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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When you view a close object, your lens gets ___ .

  1. a. flatter
  2. b. rounder
  3. c. darker
  4. d. cloudier

Summary Introduction

Introduction: The lens is a transparent and flexible tissue that provides 25-30% of the eye’s focusing power. The lens has ciliary muscles that undergo contraction and relaxation to change the shape of lens and its curvature. Visual accommodation is the process through which the eye changes focus from distant to nearby objects. It is done through action of ciliary muscles attached to the lens.

Explanation

Reason for the correct statement:

The ciliary muscles adjust the shape of the lens such that the light reflected from the nearby or distant object focuses on the retina. When a close object is focused, the ciliary muscles contract and the lens become rounder.

Hence, option b. is correct.

Reasons for the incorrect statement:

Option a. is given as “flatter”. Lens becomes flatter when light from a distant object is focused on the retina...

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