OSC OPHTHALMIC SCRIBE EXAM QUESTIONS AND ANSWERS
LATEST UPDATE A+ GRADED
Aberration
the failure of a refraction surface or lens to produce an exact point-to-point
correspondence between an object and its image
Accommodation
adjustment by the eye for seeing at different distances, accomplished by changing the
shape of the crystalline lens through action of the ciliary muscle
Albinism
a hereditary absence of pigment in the skin, hair, iris, and retina; usually associated with
a loss of visual acuity, nystagmus and photophobia; often accompanied by refractive
errors
amblyopia
decreased visual acuity without any apparent disease of the eye
ametropia
any optical error in the eye that can be corrected by glasses or contact lens
anterior chamber
the aqueous-filled space in the forward portion of the eye, bounded in front by the
cornea and behind the iris
aphakia
absence of the crystalline lens of the eye
aqueous
clear, watery fluid which fills the anterior chamber of the eye
aspheric lens
a non-spherical lens, n which the radii of curvature increase towards the periphery
rather than remaining equal at all points. aspheric lenses reduce optical aberration and
improve resolution
asthenopia
ocular fatigue caused by tiring of the muscles in or around the eye
astigmatism
a refractive error in which light rays fail to come to a single focus on the retina because
of differing amounts of refraction in the various meridians of the eye
bifocal
lens with two optical zones, one for near vision and one for distance vision
binocular vision
the ability to use both eyes simultaneously to focus on the same object and to fuse the
images from both eyes into a single image
biomicroscope
see slit lamp
blindness (legal definition)
having central visual acuity of 20/200 of less in the better eye after correction or having
visual acuity of better than 20/200 but having a visual field of no greater than 20
degrees
, canthus
the angle formed by the meeting of the upper and lower eyelids; specified as outer or
temporal, and inner or nasal
cataract
a clouding of the crystalline lens of the eye or its capsule, or both, with consequent loss
of visual acuity
chalazion
inflammatory enlargement of a meibomian gland in the eye
choriorentintis
inflammation of the choroid and retina
choroid
the vascular, intermediate layer of the eye which furnishes nourishment to the other
parts of the eye
choroiditis
inflammation of the choriod
ciliary body
a portion of the vascular layer between the iris and the choroid which consists of ciliary
processes and ciliary muscle
color deficiency
diminished ability to perceive differences in colors - usually for red or green rarely for
blue or yellow
concave lens
a lens having a surface that is rounded inward so it produces focal power that diverges
parallel rays of light; it is also called a diverging, myopic, or minus lens, and is denoted
by the minus sign
cones and rods
see rods and cones
congential
present at birth
conjuctiva
mucous membrane that lines the eyelid and covers the front part of the eyeball
conjuctivitis
inflammation of the conjuctiva; caused by irratation, allergy, or bacterial infection. (pink
eye)
contact lences
lenses so constructed that they fit directly on the eyeball
convergence
the process in which the visual areas of the two eyes are directed toward the same near
point, with the result that the eye turned inwards
convex lens
a lens having a surface that is curved outward so it produces focal power to converge
parallel rays of light to a focus; it is also called a converging, hyperopic, or plus lens,
and is denoted by the plus sign
cornea
the transparent dome shaped tissue covering the iris and the pupil
contrast sensitivity
LATEST UPDATE A+ GRADED
Aberration
the failure of a refraction surface or lens to produce an exact point-to-point
correspondence between an object and its image
Accommodation
adjustment by the eye for seeing at different distances, accomplished by changing the
shape of the crystalline lens through action of the ciliary muscle
Albinism
a hereditary absence of pigment in the skin, hair, iris, and retina; usually associated with
a loss of visual acuity, nystagmus and photophobia; often accompanied by refractive
errors
amblyopia
decreased visual acuity without any apparent disease of the eye
ametropia
any optical error in the eye that can be corrected by glasses or contact lens
anterior chamber
the aqueous-filled space in the forward portion of the eye, bounded in front by the
cornea and behind the iris
aphakia
absence of the crystalline lens of the eye
aqueous
clear, watery fluid which fills the anterior chamber of the eye
aspheric lens
a non-spherical lens, n which the radii of curvature increase towards the periphery
rather than remaining equal at all points. aspheric lenses reduce optical aberration and
improve resolution
asthenopia
ocular fatigue caused by tiring of the muscles in or around the eye
astigmatism
a refractive error in which light rays fail to come to a single focus on the retina because
of differing amounts of refraction in the various meridians of the eye
bifocal
lens with two optical zones, one for near vision and one for distance vision
binocular vision
the ability to use both eyes simultaneously to focus on the same object and to fuse the
images from both eyes into a single image
biomicroscope
see slit lamp
blindness (legal definition)
having central visual acuity of 20/200 of less in the better eye after correction or having
visual acuity of better than 20/200 but having a visual field of no greater than 20
degrees
, canthus
the angle formed by the meeting of the upper and lower eyelids; specified as outer or
temporal, and inner or nasal
cataract
a clouding of the crystalline lens of the eye or its capsule, or both, with consequent loss
of visual acuity
chalazion
inflammatory enlargement of a meibomian gland in the eye
choriorentintis
inflammation of the choroid and retina
choroid
the vascular, intermediate layer of the eye which furnishes nourishment to the other
parts of the eye
choroiditis
inflammation of the choriod
ciliary body
a portion of the vascular layer between the iris and the choroid which consists of ciliary
processes and ciliary muscle
color deficiency
diminished ability to perceive differences in colors - usually for red or green rarely for
blue or yellow
concave lens
a lens having a surface that is rounded inward so it produces focal power that diverges
parallel rays of light; it is also called a diverging, myopic, or minus lens, and is denoted
by the minus sign
cones and rods
see rods and cones
congential
present at birth
conjuctiva
mucous membrane that lines the eyelid and covers the front part of the eyeball
conjuctivitis
inflammation of the conjuctiva; caused by irratation, allergy, or bacterial infection. (pink
eye)
contact lences
lenses so constructed that they fit directly on the eyeball
convergence
the process in which the visual areas of the two eyes are directed toward the same near
point, with the result that the eye turned inwards
convex lens
a lens having a surface that is curved outward so it produces focal power to converge
parallel rays of light to a focus; it is also called a converging, hyperopic, or plus lens,
and is denoted by the plus sign
cornea
the transparent dome shaped tissue covering the iris and the pupil
contrast sensitivity
