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Chapter 14: Problem 25

To focus on objects that are close to the viewer, the a. suspensory ligaments must be pulled tight. b. lens needs to become more rounded. c. ciliary muscle will be relaxed. d. image must focus on the area of the optic nerve.

Short Answer

Expert verified
To focus on objects that are close to the viewer, the lens needs to become more rounded (option b). This is because, during the process of accommodation, the ciliary muscle contracts, suspensory ligaments become loose, and the lens becomes thicker or more rounded to focus on nearby objects.

Step by step solution

01

List down the changes that occur in the eye during accommodation for near vision

To focus on objects close to the viewer, the eye undergoes a process called "accommodation." During this process, the following changes occur: 1. The ciliary muscle contracts. 2. Suspensory ligaments become loose. 3. The lens becomes thicker or more rounded.
02

Evaluate each option

Let's analyze each option: a. Suspensory ligaments must be pulled tight. (Incorrect: This happens during distant vision, not near vision) b. Lens needs to become more rounded. (Correct: This is the change that occurs in the lens to focus on nearby objects) c. Ciliary muscle will be relaxed. (Incorrect: The ciliary muscle contracts in near vision) d. The image must focus on the area of the optic nerve. (Incorrect: This is unrelated to the process of accommodation for near vision)
03

Choose the correct option

Based on the evaluation of each option, the correct answer is: b. Lens needs to become more rounded.

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