A 68-year-old man notices that the boxes of his crossword puzzle look wavy and b

Question

A 68-year-old man notices that the boxes of his crossword puzzle look wavy and blurry for the word he is working on, but the boxes in the periphery of his focus remain clear. This symptom suggests that the man has which condition?

a. Presbyopia

b. Emmetropia

c. Cataracts

d. Macular degeneration

25. Which of the following statements about the location photoreceptors in the outermost layer of the retina is true.

a. This placement allows light to stimulate the photoreceptors via the most direct path.

b. The proximity to the pigment epithelium allows nourishment for the photoreceptor cells and recycling of photopigment.

c. This placement allows more synapses to be formed between amacrine cells and ganglion cells.

d. The proximity to the pigment epithelium determines if a photoreceptor cell differentiates into a rod or a cone.

e. This placement allows a light stimulus to be filtered when it travels through the other layers of the retina to reach the outermost layer.

26 Applying a drug that increases cGMP levels in photoreceptors would cause which effect on a photoreceptor’s response to a photon of light?

a. An intensified depolarization from normal

b. An attenuated depolarization from normal

c. An intensified hyperpolarization from normal

d. An attenuated hyperpolarization from normal

Explanation / Answer

Answer 24:- (a) presbyopia

Answer 25:- (a)

Answer 26:- an intensified depolarization from normal

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