Eye Anatomy and Function Assessment

Select the statement below that is NOT true with regards to the process of light adaptation

• Visual acuity is diminished

• Rhodopsin is uncoupled from light transduction

• Retinal sensitivity decreases

• The activity of rods is reduced by rapid bleaching of rhodopsin

The cells of the retina in which action potentials are generated in the ______.

• amacrine cells

• ganglion cells

• bipolar cells

• rods and cones

A condition where distant objects focus in front of the retina, rather than on its own, it is called ________.

• hyperopia

• myopia

• glaucoma

• diplopia

As light travels through the eye, it passes through several structures or chambers before reaching the retina. Which list below gives those structures in the correct order?

• cornea, pupil, lens, anterior chamber, posterior segment

• cornea, pupil, anterior chamber, lens, posterior segment

• cornea, lens, pupil, anterior chamber, posterior segment

• cornea, anterior chamber, pupil, lens, posterior segment

The visible light portion of the electromagnetic spectrum fits between ________.

• X-Rays and UV waves

• microwaves and radio waves

• infrared and microwaves

• UV and infrared waves

The eye muscle that rotates the eye upward and turns the eye laterally is the _____.

• lateral rectus

• medial rectus

• inferior oblique

• superior oblique

The ability to see objects clearly but not close up is properly called _______.

• myopia

• hyperopia

• diplopia

• presbyopia

Which statement about malnutrition- induced night blindness is most accurate?

• The impaired vision is caused by reduced cone function

• Vitamin supplements can reverse degenerative changes

• The most common cause is vitamin D deficiency

• Visual pigment content is reduced in cones more than rods

Color vision has much greater resolution than night vision (vision that is mostly in shades of gray). Which of the following is the best explanation for why this is so?

• There are several types of cone photoreceptors, each of which enrich the clarity and resolution of vision

• A larger proportion of the brain's visual cortex is active during the day when our cone photoreceptors are most active

• A single cone photoreceptor often connects to a single bipolar cell and a single ganglion cell while as many as 100 rods will converge to a single ganglion cell

• There are many more cone photoreceptors in the eye than rod photoreceptors

The blind spot of the eye is caused by _______

• more rods than cones within the retina

• an absence of photoreceptors where the optic nerve leaves the eye

• an absence of cones in the foveae

• the macula interrupts the nerve pathway