NOCE NOCE Contact Lens Fitting and Care 2

Question 1

Which instrument is used to verify the base curve and power of a rigid gas-permeable (RGP) contact lens?

Accepted Answer

Radiuscope

Answer

Keratometer

Answer

Lensometer (focimeter)

Answer

Biomicroscope (slit lamp)

Question 2

When fitting a soft contact lens, which observation indicates an excessively STEEP (tight) fit?

Accepted Answer

Reduced or absent lens movement with a push-up test

Answer

Excessive lens movement of 3–4 mm on blink

Answer

Lens edge lifting and air bubbles visible at limbus

Answer

Lens frequently falling out of the eye

Question 3

Vertex distance compensation in contact lens prescribing is generally required when the spectacle prescription exceeds what power?

Accepted Answer

±4.00 D

Answer

±2.00 D

Answer

±6.00 D

Answer

±10.00 D

Question 4

What does lag (or lens lag) describe in contact lens fitting assessment?

Accepted Answer

The movement of the lens in the opposite direction after an eye movement

Answer

The time delay before a new lens stabilizes on the eye

Answer

The delay in vision improvement after lens insertion

Answer

The amount the lens dehydrates over a wearing period

Question 5

The push-up test during soft contact lens fitting is used to assess what parameter?

Accepted Answer

Lens movement and fit tightness (lens mobility)

Answer

Lens optical power

Answer

Corneal curvature changes

Answer

Lens water content suitability

Question 6

In contact lens prescribing, what is the recommended approach when there is a significant amount of residual astigmatism with a spherical soft lens?

Accepted Answer

Prescribe a toric soft contact lens to correct the residual cylinder

Answer

Prescribe a spherical RGP lens to mask all astigmatism

Answer

Increase the sphere power to compensate

Answer

Recommend spectacles only and discontinue contact lens fitting