Question

(a) presbyopia.
(b) accommodation
(c) near-sightedness.
(d) far-sightedness.​

Answer 1

Answer:

a. Most experts believe presbyopia is caused by changes to the lens inside the eye. As people age, the lens becomes harder and less elastic, making it more difficult for the eye to focus on close objects. For centuries presbyopia was corrected with the use of bifocal eyeglasses.

b. Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. ... Mammals, birds and reptiles vary the optical power by changing the form of the elastic lens using the ciliary body (in humans up to 15 dioptres).

c. A condition in which close objects appear clearly, but far ones don't.

Near-sightedness tends to run in families.

d. A vision condition in which nearby objects are blurry.

Hyperopia is a common vision condition in adults.

Hope it helps you..

Answer 2

The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to

(a) presbyopia

(b) accommodation  ****** ur answer

(c) near-sightedness

(d) far-sightedness

[b]Due to accommodation the human eye can focus objects at different distances by adjusting the focal length of the eye lens.