optic zone - Answer the central portion of a contact lens which contains the refractive power and generally corresponds to the central corneal cap
posterior apecal radius - Answer this term is generally used in reference to spin-cast soft lenses. the curvature of the posterior surface of the len...
NCLE exam prep with verified ans 2024
optic zone - Answer the central portion of a contact lens which contains the refractive
power and generally corresponds to the central corneal cap
posterior apecal radius - Answer this term is generally used in reference to spin-cast
soft lenses. the curvature of the posterior surface of the lens changes with the
refractive power. the radius of curvature is measured at the apex of the posterior
surface.
steeper base curve - Answer occurs when the posterior radius of curvature is
decreased (i.e. 8.4 to 8.1 mm)
flatter base curve - Answer occurs when the posterior radius of curvature is
increased (i.e.8.1 to 8.4 mm)
bicurve lens - Answer a contact lens which contains two curves: one base curve and
one secondary curve. it is usually small 7.5 to 8.8 mm on diameter, relatively steep
and made with narrow peripheral curves about 0.2 mm. lenses are usually
intrapalpebral lenses, designed to fit within the palpebral fissure limits.
tricurve lens - Answer a contact lens which contains three curves: a base curve, an
outer peripheral posterior curve (PPC), and an intermediate posterior curve (IPC).
lenses are generally larger, 9.5 mm or greater.
multicurve lens - Answer contains a base curve and three or more peripheral curves.
usually a larger lens.
junctional zone - Answer the junction of two curves
blending - Answer the smoothing of a junctional zone by removing the sharp line
between the zones
lens diameter or chord diameter - Answer the width of a lens or the measurement
from one edge of the lens to the opposite edge
curve widths - Answer the width of the CPC, PPC, or IPC
central thickness - Answer separation between the anterior and posterior surface at
the geometric center of the lens. minus lenses are thinner, plus lenses are thicker
ballasted lens - Answer lens with a heavier base which becomes oriented inferiorly
or downward when the lens is worn
prism ballated lens - Answer a ballasted lens which utilizes a prism wedge designed
to weight the lens
truncated lens - Answer a lens which has been cut off, usually 0.5-1.5 mm along its
lower edge, to form a horizontal base. double ________ along the top and bottom
portion of the lens is sometimes done to help improve stabilization
,NCLE exam prep with verified ans 2024
back surface power - Answer effective power of a lens when measured from the
back surface
wetting angle - Answer the angle that the edge of a bead of water makes with the
surface of the plastic, the smaller the angle the greater the wetting ability
toric lenses or toroid lenses - Answer lenses with different radii of curvature in each
meridian which are used to correct astigmatism
principal meridians - Answer the meridians of shortest and longest radii which differ
by 90 degrees
front surface toric lens - Answer a lens in which the anterior surface has two different
radii and the posterior surface is spherical
back surface toric lens - Answer a lens in which the posterior surface has two
different radii and the anterior surface is spherical
bitoric lens - Answer a lens in which both the posterior and anterior surfaces contain
two different radii
lenticular bowl - Answer a lens design generally used in higher plus power which
consists of a central optic zone and a surrounding non-optic peripheral or "carrier"
portion
spin-cast soft lens - Answer a mentioned of manufacturing soft contact lenses
whereby a liquid material is revolved in a mold at a controlled speed and
temperature which produces the desired curvature, design, and power
acuity - Answer clearness; visual ________ is measured by the smallest object that
can be seen at a certain distance
adnexa oculi - Answer accessory structures of the eye, such as the lacrimal
appatatus and the eyelids
albinism - Answer heredetary loss of pigment in the eye, skin, hair, usually
associated with lowered visual acuity, nystagmus and light sensitivity
amblyopia - Answer loss of vision without any apparent disease of the eye
ametropia - Answer a refractive error in which the eye, when in a state of rest, does
not focus the image of an object upon the retina; includes hyperopia, myopia, and
astigmatism. see also refractive error
aniridia - Answer congenital absence of the iris
aniseikonia - Answer a condition in which the ocular image of an object as seen by
one eye differs so much in size or shape from that seen by the other eye that the two
images cannot be focused into a single impression
,NCLE exam prep with verified ans 2024
aniscoria - Answer inequality of the pupils in diameter
anomaly - Answer departure from the normal
anophthalmia - Answer absence of a true eyeball
anterior chamber - Answer space in front of the eye, bounded in front by the cornea
and behind by the iris; filled with aqueous humor
antibody - Answer a specific substance produced by the body in the presence of an
antigen
antigen - Answer any substance that acts against the action of histamine
antihistamine - Answer a substance that acts against the action of histamine
aphakia - Answer absence of the crystalline lens of the eye
aqueous humor - Answer clear, watery fluid that fills the anterior and posterior
chambers within the front part of the eye
arcus senilus - Answer grayish white ring in the periphery of the cornea
asthenopia - Answer eye fatigue caused by tiring of the internal and/or external
muscles
astigmatism - Answer a refractive error that prevents the light rays from coming to a
single focus on the retina because of different degrees of refraction in the various
meridians of the eye
against the rule astigmatism - Answer condition in which the steepest corneal
meridian is in the horizontal plane. an example of keratometer readings for a patient
exhibiting_______________ would be: K's 45.00 @ 180/042.00 @ 90
lenticular astigmatism - Answer astigmatism that is found in the crystallilne lens
oblique astigmatism - Answer regular astigmatism in which the principal meridians
are other than 90 and 180
residual astigmatism - Answer astigmatism remaining after the corneal astigmatism
has been neutralized
with the rule astigmatism - Answer condition in which the steepest corneal meridian
is in the vertical plane. as example of keratometer readings for a patient exhibiting
with the rule astigmatism would be: k's 42.00 @ 180/45.00 @90
atrophy - Answer wasting or decreasing of a tissue due to faulty nutrition or loss of
nerve supply
hydrogel - Answer soft contact lenses are also known as:
, NCLE exam prep with verified ans 2024
silicone hydrogel - Answer what soft lens material provides greater oxygen
permeability without increasing the water content of the lens?
flexible wear - Answer extended wear lens that is worn on a daily wear basis
BVP back vertex power - Answer when neutralizing a lens in back vertex power,the
concave or posterior side of the lens is placed against the aperture of the
lensometer.
beweding (cornea) - Answer an edematous condition of the epithelium of the cornea
characterized by irregular reflecting from a multitude of droplets when the cornea is
viewed with the slit lamp
biconcave lens - Answer lens having a concave surface on both faces.
biconvex lens - Answer lens having a convex surface on both faces.
binocular vision - Answer ability to use the two eyes simultaneously to focus on the
same interpretation of its solidity and its position in space.
blepharitis - Answer inflammation of the margins of the eyelids.
blepharoconjuctivitis - Answer inflammation of the eyelid and conjunctiva.
blepharoplasty - Answer plastic surgery of the eyelid.
blepharoptisis - Answer drooping of the eyelid
blepharospasm - Answer excessive winking; tonic or clonic spasm of the orbicularis
oculi muscle
blindness - Answer in the US, usually defined as central visual acuity of 20/200 or
less in the better eye after correction, or visual acuity or more than 20/200 if there is
a field defect in which the widest diameter of the visual field subtends an angle
distance no greater than 20 degrees (some states include up to 30 degress)
bulbar - Answer pertaining to the globe
buphthalmos - Answer enlargement of the eyeball, resulting usually from congenital
(infantile) glaucoma.
C,CC (cum correction) - Answer "with correction" or wearing prescribed lenses
canaliculus - Answer passageway for drainage of tears from eyes to tear sac
canthus - Answer the angle at either end of the slit between the eyelids; specified as
outer (temporal) and inner (nasal)
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