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NCLE Study Guide Exam Questions And All Actual Answers.
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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 mu...

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  • September 26, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • layer of the cornea

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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

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