Lecture 11 Quiz

Hyperopia causes the image to be focused: A) behind the retina B) on the fovea C) on the optic disk D) in front of the retina

A) behind the retina

Which of the following occurs when focusing on a close object? A) contraction of the ciliary muscle to make the lens more convex B) contraction of the ciliary muscle to flatten the lens C) relaxation of the ciliary muscle to make the lens more convex D) relaxation of the ciliary muscle to flatten the lens

A) contraction of the ciliary muscle to make the lens more convex

Light is refracted the most by the ________. A) cornea B) aqueous humor c) lens d) vitreous humor

A) cornea

Long term blockage of the scleral venous sinus can induce ________. A) glaucoma B) cataracts C) macular degeneration D) detached retina

A) glaucoma

The fovea of the retina is unique because: A) only cones are found there B) only rods are found there C) it is impossible for light rays to be focused on that spot D) there are no rods or cones there

A) only cones are found there

Which of the following conditions exists after the photoreceptor has been exposed to light? A) retinal is in its trans-retinal orientation B) the photopigment is not bleached C) inhibitory neurotransmitter release is constant D) cGMP is bound to sodium channels

A) retinal is in its trans-retinal orientation

Which type of eye movements involve jumping from object to object? A) saccadic B) smooth pursuit C) vergence D) papillary

A) saccadic

Accommodation would occur when________. A) the muscles of the ciliary body contract B) the suspensory ligaments become taut C) objects move further away from the eye D) the lateral rectus muscle contracts

A) the muscles of the ciliary body contract

A patient diagnosed with hyperopia stands 20 feet away from the eye chart. Without corrective lenses, the images on the chart ________. A) will come into focus posterior the retina B) will come into focus anterior to the retina C) will be centered on the fovea centralis D) will be lateral to the retina

A) will come into focus posterior the retina

What structure holds the lens in place? A) Scleral venous sinus B) Suspensory ligament C) choroid D) iris

B) Suspensory ligament

The aggregation of crystallin protein in the lens produces clouding called ________. A) glaucoma B) cataracts C) astigmatism D) myopia

B) cataracts

Functions of the pigment epithelium of the retina do NOT include ________. A) absorption of scattered light B) creating the dark current of the photoreceptors

B) creating the dark current of the photoreceptors

Retinitis pigmentosa is characterized by________. A) deterioration of the striate cortex B) degeneration of photoreceptors C) degeneration of the optic nerve D) degeneration of the cornea

B) degeneration of photoreceptors

Emmetropia causes the image to be focused: A) behind the retina B) on the fovea C) on the optic disk D) in front of the retina

B) on the fovea

When in a dim light setting, the iris: A) radial (dilator) muscle contract due to PSNS stimulation B) radial (dilator) muscles contract due to SNS stimulation C) constrictor (circular) muscles contract due to PSNS stimulation D) constrictor (circular) muscles contract due to SNS stimulation

B) radial (dilator) muscles contract due to SNS stimulation

Which of the following occurs when there is significant asymmetry of the cornea and/or lens? A) myopia B) hyperopia C) astigmatism D) presbyopia

C) astigmatism

What condition occurs when the eyeball is too short and the focal point appears behind the eyeball? A) astigmatism B) myopia C) hyperopia D) presbyopia

C) hyperopia

A patient undergoes an eye exam and is diagnosed with ________. A ________ lens would correct this disorder of refraction. A) presbyopia; concave B) myopia; concave C) hyperopia; convex D) astigmatism; convex

C) hyperopia; convex

Which of the following conditions exists after the photoreceptor has been exposed to light? A) retinal is in its cis-retinal orientation B) the photopigment is not bleached C) inhibitory neurotransmitter release stops D) cGMP is bound to sodium channels

C) inhibitory neurotransmitter release stops

What area of the retina has no photoreceptors? A) fovea centralis B) macula C) optic disc D) none of the choices are correct

C) optic disc

Within the eye, electrical impulses pass from ________. A) photoreceptors to ganglion cells to bipolar cells B) ganglion cells to bipolar cells to photoreceptors C) photoreceptors to bipolar cells to ganglion cells D) bipolar cells to photoreceptors to ganglion cells

C) photoreceptors to bipolar cells to ganglion cells

The bending of light as it passes through different media is called ________. A) accommodation B) visual acuity C) refraction D)astigmatism

C) refraction

When viewing an object far away, the ciliary muscle will ________, the suspensory ligament will ________, and the lens will become more ________. A) contract; tighten; rounded B) contract; loosen; rounded C) relax; tighten; flattened D) relax; loosen; flattened

C) relax; tighten; flattened

An individual with astigmatism would have their vision corrected by ________. A) a convex lens B) a concave lens C) toric lens D) a magnifying lens

C) toric lens

What is found in the posterior cavity of the eyeball? A) aqueous humor B) blood C) vitreous humor D) pigment

C) vitreous humor

Cone types do not include ________. A) red B) blue C) yellow D) green

C) yellow

Which of the following conditions exists after the photoreceptor has been exposed to light? A) retinal is in its cis-retinal orientation B) the photopigment is not bleached C) inhibitory neurotransmitter release is constant D) 5' GMP is bound to sodium channels

D) 5' GMP is bound to sodium channels

When an object is more than 20 feet from the eyes,________. A) the ciliary muscle relaxes B) there is tension on the suspensory ligament C) the lens is pulled and flattened D) All of the choices are correct.

D) All of the choices are correct.

Cells in the retina which connect photoreceptors and ganglion cells are called ________. A) horizontal cells B) retinal epithelial cells C) amacrine cells D) bipolar cells

D) bipolar cells

In the absence of light, there is movement of Na + in the photoreceptors causing a depolarization. This is called the________. A) dark adaption B) visual cycle of retinal C) bleaching reaction D) dark current

D) dark current

The optic nerve is formed from fibers of ________. A) rods and cones B) bipolar cells C) amacrine cells D) ganglion cells

D) ganglion cells

Loss of accommodation with age is ________. A) astigmatism B) myopia C) hyperopia D) presbyopia

D) presbyopia

Pupil diameter would be increased by contraction of the ________. A) circular muscles B) ciliary body C) superior rectus muscle D) radial muscles

D) radial muscles

What type of eye movement helps you to follow a moving object? A) vergence B) saccadic C) fixational D) smooth pursuit

D) smooth pursuit

The optic disk of the retina is unique because: A) only cones are found there B) only rods are found there C) it is impossible for light rays to be focused on that spot D) there are no rods or cones there

D) there are no rods or cones there

The near point of vision decreases with increasing age.

False

Being able to distinguish separate trees in the forest is an example of the resolving power of visual acuity.

True

Each cone communicates with only one ganglion cell, while many rods communicate with one ganglion cell.

True

The generator potential produced in photoreceptors is a hyperpolarization.

True