chapter 8: the eye
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
