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NCLE Practice Exam/169 Questions With Complete Solutions
NCLE Practice Exam/169 Questions With Complete Solutions
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NCLE Practice Exam/169Questions With Complete
Solutions
base curve - -refers to the radius of curvature of the central posterior
surface of the lens. It may be expressed in diopters of surface power (D) or in
millimeters (mm) of radius or curvature.
-optical zone - -the chord diameter over which the base curve extends on
the posterior surface of the contact lens, described in millimeters
-secondary or intermediate curves - -lies between the base curve and the
peripheral curve on the posterior lens surface, usually 0.70mm to 1.50mm
flatter than the base curve radius, this allows the lens to better align the
flatter portion of the cornea adjacent to the optical zone
-peripheral curve - -the outermost curve on the posterior lens surface, its
function is to clear the flatter periphery of the cornea and to prevent lens
impingement in the limbal areas as the lens moves with blinking
-blend curve - -the treatment given to the sharp junctions created by the
difference in the radii of curvature between the base curve, the secondary
curve, and the peripheral curve, rarely required at the base curve/secondary
curve junction.
-lens diameter - -refers to the overall width of the lens from one edge to the
other, it is measured in millimeters. Normal ranges are from 7.00mm to
10.50mm in rigid lenses and from 12.50mm to 16.00mm in soft contacts
-center thickness - -the measurement in millimeters from the anterior to the
posterior surface of the lens at its geometric center, this measurement
varies significantly depending on the power of the lens
-anterior - -nearer the front, especially situated in the front of the body or
nearer to the head
-posterior - -further back in position; of or nearer the rear or hind end,
especially of the body or a part of it.
-lens power - -the difference between the radii of the anterior and posterior
lens surface
-abrasion - -rubbing off of the superficial layer
, -accommodation - -adjustment by the eye for seeing different distances,
accomplished by changing the shape of the crystalline lens through action of
the ciliary muscle
-acuity - -clearness; measured by the smallest object that can seen at a
certain distance
-adnexa oculi - -accessory structures of the eye, such as lacrimal apparatus
and the eye lids
-albinism - -hereditary loss of pigment in the eye, skin & hair; usually
associated with lowered visual acuity, nystagmus & light sensitivity
-amblyopia - -loss of vision with any apparent disease of the eye
-ametropia - -a refractive error in which the eye, when in state of rest, does
not focus the image of an object upon the retina; includes hyperopia,myopia
and astigmatism
-aniridia - -congenital absence of the iris
-aniseikonia - -a condition in which the ocular image of an object as seen by
one eye differs so much in size or shape from the seen by the other eye that
the two images cannot be fused into a single impression
-aniscoria - -inequality of the pupils in diameter
-anomaly - -departure from the normal
-anopthalmia - -absence of a true eyeball
-anterior chamber - -space in front of the eye, bounded in front by the
cornea and behind by the iris; filled with aqueous humor
-antibody - -a specific substance produced by the body in the presence of
an antigen
-antigen - -any substance that acts against the action of histamine
-aphakia - -absence of the crystalline lens of the eye
-aqueous humor - -clear, watery fluid that fills the anterior and posterior
chambers within the front part of the eye
-arcus senilus - -grayish white ring in the periphery of the cornea
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