Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 28 - Think and Explain: 90

Answer

This is due to a medical condition known as presbyopia.

Work Step by Step

The eye's "near point" moves farther away as one becomes older, i.e., it becomes harder to focus on nearby objects. This is because the lens in the eye becomes less flexible.
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