AOA Contact Lens Practice 2

Question 1

Scleral contact lenses differ from corneal RGP lenses primarily because they:

Accepted Answer

Vault the entire cornea and rest on the sclera

Answer

Are softer and conform to the corneal shape

Answer

Have higher water content than soft lenses

Answer

Are designed for daily disposable use only

Question 2

Silicone hydrogel lenses have largely replaced conventional hydrogel lenses because they offer:

Accepted Answer

Higher oxygen permeability with similar or better comfort

Answer

Lower modulus of elasticity

Answer

Greater resistance to lipid deposits

Answer

Reduced UV exposure to the cornea

Question 3

Acanthamoeba keratitis is uniquely associated with which contact lens behavior?

Accepted Answer

Rinsing lenses with tap water or swimming while wearing lenses

Answer

Sleeping in daily disposable lenses

Answer

Using expired lens care solutions

Answer

Over-wearing annual replacement lenses

Question 4

When fitting toric soft contact lenses, the lens should rotate to the:

Accepted Answer

Correct orientation as marked by the stabilization ballast

Answer

Superior limbus for maximum stability

Answer

Nasal position regardless of the prescription

Answer

Lower lid position to allow blink-driven rotation

Question 5

Which condition is a primary indication for fitting a patient with rigid gas-permeable lenses instead of soft lenses?

Accepted Answer

Keratoconus with irregular astigmatism

Answer

Low myopia with no astigmatism

Answer

High water loss dry eye syndrome

Answer

History of giant papillary conjunctivitis

Question 6

Contact lens-induced corneal neovascularization is primarily caused by:

Accepted Answer

Chronic corneal hypoxia stimulating VEGF release

Answer

Mechanical trauma from lens edge

Answer

Solution sensitivity reaction

Answer

Protein deposits on the lens surface