NCLE Practice Exam Questions And Already Passed Answers.
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Course
NCLE
Institution
NCLE
base curve - Answer 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 - Answer the chord diameter over which the base curve extends on the posterio...
NCLE Practice Exam Questions And
Already Passed Answers.
base curve - Answer 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 - Answer the chord diameter over which the base curve extends on the posterior surface
of the contact lens, described in millimeters
secondary or intermediate curves - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer nearer the front, especially situated in the front of the body or nearer to the head
posterior - Answer further back in position; of or nearer the rear or hind end, especially of the body or
a part of it.
, lens power - Answer the difference between the radii of the anterior and posterior lens surface
abrasion - Answer rubbing off of the superficial layer
accommodation - Answer adjustment by the eye for seeing different distances, accomplished by
changing the shape of the crystalline lens through action of the ciliary muscle
acuity - Answer clearness; measured by the smallest object that can seen at a certain distance
adnexa oculi - Answer accessory structures of the eye, such as lacrimal apparatus and the eye lids
albinism - Answer hereditary loss of pigment in the eye, skin & hair; usually associated with lowered
visual acuity, nystagmus & light sensitivity
amblyopia - Answer loss of vision with any apparent disease of the eye
ametropia - Answer 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 - 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 the seen by the other eye that the two images cannot be fused into a single
impression
aniscoria - Answer inequality of the pupils in diameter
anomaly - Answer departure from the normal
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