NCLE Study Guide Exam Questions And
All Actual Answers.
What is the thickest layer of the cornea? - Answer stroma
Which corneal layer controls the fluid content of the cornea? - Answer endothelium
What is cornea edema? - Answer excess fluid in the stroma that can swell it and lead to loss of visual
acuity
What kind of contact lenses must be stabilized (not rotate) on the eye for good vision? - Answer toric
contact lenses
Concentric vs Aspheric Multifocal Lens Design - Answer aspheric multifocal lenses have a gradual
change in power from distance to near where as the power change in concentric designs is not gradual
eye dominance - Answer the preference of one eye over the other for visual acuity and monocular
activity
average central corneal curvature - Answer 7.8 mm of radius or 43.25D
cornea's index of refraction - Answer 1.376
corneal apex - Answer Central and steepest part of the cornea, 3-5 mm in diameter. (also the only part
of the cornea tested during keratometry reading)
with-the-rule astigmatism - Answer the vertical corneal meridian has the steepest curvature
, against-the-rule astigmatism - Answer the horizontal meridian has the steepest curvature
Oblique astigmatism - Answer regular astigmatism in which the principal meridians are other than 90 &
180
Irregular astigmatism - Answer The principal meridians are not 90 degrees apart
HVID (horizontal visible iris diameter) - Answer measured corneal diameter. average= 11.7 mm
Apical Alignment/Lid Attachment - Answer upper lens edge is tucked unter upper eye lid and moves
with blinking motion
What material is used to evaluate GP lenses under a slit lamp? - Answer fluorescein
Increasing saggital depth will... - Answer tighten lens fit
How to decrease saggital depth - Answer decrease diameter and/or flatten base curve
Lenticular Astigmatism - Answer astigmatism found in the crystalline lens
What is neutralization in the lens care system? - Answer neutralizing hydrogen peroxide disinfectant
before wear contact lenses on the eye
How much NaCl is in the tear film and saline solution? - Answer 0.9%
What is used to rinse/wet contact lens rather than tap water? - Answer saline solution
How much refractive astigmatism is allowable for spherical SOFT contact lenses? - Answer ~0.75 D or
less
All Actual Answers.
What is the thickest layer of the cornea? - Answer stroma
Which corneal layer controls the fluid content of the cornea? - Answer endothelium
What is cornea edema? - Answer excess fluid in the stroma that can swell it and lead to loss of visual
acuity
What kind of contact lenses must be stabilized (not rotate) on the eye for good vision? - Answer toric
contact lenses
Concentric vs Aspheric Multifocal Lens Design - Answer aspheric multifocal lenses have a gradual
change in power from distance to near where as the power change in concentric designs is not gradual
eye dominance - Answer the preference of one eye over the other for visual acuity and monocular
activity
average central corneal curvature - Answer 7.8 mm of radius or 43.25D
cornea's index of refraction - Answer 1.376
corneal apex - Answer Central and steepest part of the cornea, 3-5 mm in diameter. (also the only part
of the cornea tested during keratometry reading)
with-the-rule astigmatism - Answer the vertical corneal meridian has the steepest curvature
, against-the-rule astigmatism - Answer the horizontal meridian has the steepest curvature
Oblique astigmatism - Answer regular astigmatism in which the principal meridians are other than 90 &
180
Irregular astigmatism - Answer The principal meridians are not 90 degrees apart
HVID (horizontal visible iris diameter) - Answer measured corneal diameter. average= 11.7 mm
Apical Alignment/Lid Attachment - Answer upper lens edge is tucked unter upper eye lid and moves
with blinking motion
What material is used to evaluate GP lenses under a slit lamp? - Answer fluorescein
Increasing saggital depth will... - Answer tighten lens fit
How to decrease saggital depth - Answer decrease diameter and/or flatten base curve
Lenticular Astigmatism - Answer astigmatism found in the crystalline lens
What is neutralization in the lens care system? - Answer neutralizing hydrogen peroxide disinfectant
before wear contact lenses on the eye
How much NaCl is in the tear film and saline solution? - Answer 0.9%
What is used to rinse/wet contact lens rather than tap water? - Answer saline solution
How much refractive astigmatism is allowable for spherical SOFT contact lenses? - Answer ~0.75 D or
less
