Question

Explain why people over 55 often need reading glasses. a. Their cornea no longer focuses correctly. b. Their lens no longer focuses correctly. c. Their eyeball has elongated with age, causing images to focus in front of their retina. d. Their retina has thinned with age, making vision more difficult.

Name: Problem 34, Chapter 27: Biology for AP Courses
Uploaded: 2019-07-30T23:03:53-08:00
Duration: 43 s
Channel: Aadit Sharma
Description: Explain why people over 55 often need reading glasses. a. Their cornea no longer focuses correctly. b. Their lens no longer focuses correctly. c. Their eyeball has elongated with age, causing images to focus in front of their retina. d. Their retina has thinned with age, making vision more difficult.

   Explain why people over 55 often need reading glasses.
a. Their cornea no longer focuses correctly.
b. Their lens no longer focuses correctly.
c. Their eyeball has elongated with age, causing images to focus in front of their retina.
d. Their retina has thinned with age, making vision more difficult.

Biology for AP Courses

Julianne Zedalis,…

Chapter 27, Problem 34

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Solved by Expert Aadit Sharma

07/30/2019

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The options provided suggest different reasons related to changes in the eye structure with age. Show more…

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Explain why people over 55 often need reading glasses. a. Their cornea no longer focuses correctly. b. Their lens no longer focuses correctly. c. Their eyeball has elongated with age, causing images to focus in front of their retina. d. Their retina has thinned with age, making vision more difficult.

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Key Concepts

Presbyopia

Presbyopia is an age-related condition that affects the eye's ability to focus on close objects. It occurs due to a gradual loss of elasticity in the lens, leading to difficulty in changing its shape—a process essential for proper near vision.

Lens Elasticity

Lens elasticity refers to the capacity of the eye's lens to bend or change shape, allowing it to focus light correctly on the retina. As people age, the lens becomes less flexible, which impairs its ability to adjust for near vision tasks, necessitating the use of reading glasses.

Accommodation

Accommodation is the process by which the eye adjusts its focusing power to see objects at different distances. This adjustment relies on the flexibility of the lens. With aging, reduced lens elasticity diminishes the eye's accommodative ability, thereby making it harder to focus on close-up items.

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