The first vestiges of eyes in the embryo are called ________.
A) optic vesicles
B) mesenchyme
C) optic discs
D) optic cups
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Question 2) The elasticity of the lens decreases with age. This leads to which of the following?
A) less light getting to the retina and diminished visual acuity
B) lowered accommodation of the pupillary reflex and blurry vision
C) a clouding of the lenses know as a cataract
D) less accommodation of the lenses and difficulty focusing on nearby objects
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Question 3) Which of the following is the best explanation for our perception of color?
A) Rods contain a single kind of visual pigment.
B) Cones come in three types, each sensitive to different wavelengths of light.
C) The foveae are densely packed with cones.
D) As many as 100 cones may converge on one ganglion cell.
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Question 4) The blind spot of the eye is caused by ________.
A) the macula lutea interrupts the nerve pathway
B) there are no photoreceptors where the optic nerve leaves the eye
C) an absents of cones in the foveae
D) more rods than cones within the retina
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Question 5) Which of the following is the best explanation for why night vision is fuzzy and indistinct?
A) Rods contain a single kind of visual pigment.
B) Cones come in three types, each sensitive to different wavelengths of light.
C) The foveae are densely packed with cones.
D) As many as 100 cones may converge on one ganglion cell.
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Question 6) Which of the following is the best explanation of why it is difficult to discriminate the color of an object at night?
A) Rods contain a single kind of visual pigment.
B) Cones come in three types, each sensitive to different wavelengths of light.
C) The foveae are densely packed with cones.
D) As many as 100 cones may converge on one ganglion cell.
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Question 7) Most newborns ________.
A) are myopic
B) see in tones of red and green only
C) cry with copious tears
D) often use only one eye at a time
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Question 8) In a person who is color blind, which of the following would you most expect to see?
A) a loss of functions in the rods of their retina
B) an inability to regenerate 11-cis-retinal after bleaching
C) absence of green or red cones in their foveae
D) a loss of their peripheral vision
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Question 9) The only special sense not fully functional at birth is the sense of ________.
A) equilibrium
B) smell
C) taste
D) vision
E) hearing
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Question 10) Nutrients are delivered and waste products are carried away from the cells of the posterior segment of the eye by blood vessels. However, the cells in the cornea and lens (in the anterior segment) are avascular.
Which is the best explanation for how these cells are maintained?
A) The nutrients and waste products of the anterior segment diffuse into and through the vitreous humor of the posterior segment.
B) The metabolic activity of these cells is very low. They produce little waste and need few nutrients.
C) These cells, like the cells of the corneal layer of the integument are not living cells.
D) The aqueous humor is continuously replenished and flows from the ciliary process to drain in the scleral venous sinus.
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