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NCLE EXAM 2025 NEWEST EXAM 2 VERSIONS AND
PRACTICE EXAM QUESTIONS 400 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT)
/ALREADY GRADED A+
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)
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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
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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
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base. double ________ along the top and bottom portion of the
lens is sometimes done to help improve stabilization
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
NCLE EXAM 2025 NEWEST EXAM 2 VERSIONS AND
PRACTICE EXAM QUESTIONS 400 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT)
/ALREADY GRADED A+
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)
,Page 2 of 208
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
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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
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base. double ________ along the top and bottom portion of the
lens is sometimes done to help improve stabilization
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
