CPOA Contact Lens Basics 4

Question 1

When instructing a new contact lens patient on proper hand hygiene, which type of soap should be recommended?

Accepted Answer

Fragrance-free, lotion-free soap

Answer

Fragrance-free, lotion-free soaps are recommended because additives like lotions or fragrances can contaminate lenses and irritate eyes.

Question 2

Which parameter uniquely identifies a toric soft contact lens prescription compared to a spherical prescription?

Accepted Answer

Cylinder power and axis

Answer

Toric lenses are defined by their sphere power plus the cylinder power and axis needed to correct astigmatism.

Question 3

The 'add' power in a multifocal contact lens prescription is used to correct which vision condition?

Accepted Answer

Presbyopia

Answer

Add power compensates for the loss of accommodative ability in presbyopic patients, allowing clear near vision.

Question 4

What is the most common organism responsible for Acanthamoeba keratitis in contact lens wearers?

Accepted Answer

Acanthamoeba castellanii

Answer

Acanthamoeba castellanii is the most common species causing this rare but severe corneal infection, often linked to rinsing lenses with tap water.

Question 5

A contact lens patient asks about 'monovision.' Which description is most accurate?

Accepted Answer

One eye corrected for distance and the other for near

Answer

Monovision fits one eye (usually dominant) for distance and the other for near to address presbyopia without multifocal lenses.

(CPOA) Certified Paraoptometric Assistant Practice Test