chapter 8: the eye

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what is the ability of the eye to focus on close objects?

accommodation

what is the correct order of the parts through which light passes through which light passes as it enters the eye?

aqueous humor cornea lens vitreous humur

in the inability to see distant objects is termed "nearsighted" or _____

astigmatism

the overlapping of the two visual fields that provides for depth perception (3-D vision) results in ______?

binocular vision

What vision disorder results from the loss of lens transparency?

cataracts

which area of the retina has the highest concentration of cones?

choroid

the gel-like substance that reinforces the eyeball and prevents it from collapsing inward is the _____.

ciliary body

which of the following is a sex-linked condition that move often affects males?

color blindness

Type of photoreceptor cell that detects colors

cones

the membrane that covers the outer surface of the eye and lines the eyelid ____.

conjuctiva

what is the reflexive movement of both eyes medially to view objects close to us?

convergence

the transparent potion of the fibrous layer of the eye is the _____?

cornea

transparent portion of the fibrous layer

cornea

TRUE/FALSE:cones are photoreceptors cells that allows us to see gray tones in dim light.

false

What part of the eye has the greatest visual acuity?

fovea centralis

area that greatest visual acuity

fovea centralis

the pupil Is an opening within the ___?

iris

what gland releases tears onto the anterior surface of the eyeball?

lacrimal

which gland is located above the lateral end of each eyes and releases tears?

lacrimal

gland that secretes tears

lacrimal gland

Flexible biconvex crystal-like structure

lens

the biconvex structure that focuses light on the retina is the ___?

lens

Fibers from the medial side of each eye cross over to the opposite side of the brain at the __________.

optic chiasma

What flexible, crystal-like structure of the eye focuses light on the retina?

optic chiasma

portion of the optic nerve that lacks photoreceptor cells

optic disc

what region of the retina lacks photoreceptors?

optic disc

what is the pathway which image received by the retina of the eye will travel into the brain?

optic nerve optic chisma optic tracts thalamus optic radiation occipital lobe

what part of the retina absorbs light and prevents it from scattering inside the eye?

pigmented layer

Which layer of the eye contains photoreceptors know as rods and cones?

retina

layer that contains millions of photoreceptors

retina

which layer of the eye contains rods and cones?

retina

a person with total color blindness may lack ______.

rods

what type of photoreceptor cell allows us to see gray tones in the dim light, and provides our peripheral vision?

rods

"White of the eye"

sclera

the fibrous covering of the eye consists of the white outer layer, know as the ____ and a transparent portion know as the ___.

sclera; cornea

when Brock walked out of the dark movie theater into the bright, mid-day sun, he experienced _____?

the photopupillary reflex

TRUE/FALSE: An astigmatism results from unequal curvatures of the cornea or lens.

true

TRUE/FALSE: from the optic nerve, the visual pathways continues to the optic chiasma, optic tracts, thalamus, optic radiation, and then visual interpretation occurs in the occipital lobe.

true

TRUE/FALSE: the normal resting eye is generally "set" for the distant vision.

true

TRUE/FALSE: the pupil is the circular opening in the iris through which light passes.

true

TRUE/FALSE: we cannot see images formed on the optic disc (blind spot).

true

TRUE/FALSE:the ciliary body is a smooth muscle structure to which the lens is attached.

true

the gel-like substance housed in the posterior segment of the eye is the ___

vitreous humor

type of the gel-like substance located in the posterior segment

vitreous humor


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