Contact Lens Basics Flashcards
7 cards from real CPOA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Contact Lens Basics flashcards as text
When instructing a new contact lens patient on proper hand hygiene, which type of soap should be recommended?
Answer: Fragrance-free, lotion-free soap
Fragrance-free, lotion-free soaps are recommended because additives like lotions or fragrances can contaminate lenses and irritate eyes.
Which parameter uniquely identifies a toric soft contact lens prescription compared to a spherical prescription?
Answer: Cylinder power and axis
Toric lenses are defined by their sphere power plus the cylinder power and axis needed to correct astigmatism.
The 'add' power in a multifocal contact lens prescription is used to correct which vision condition?
Answer: Presbyopia
Add power compensates for the loss of accommodative ability in presbyopic patients, allowing clear near vision.
What is the most common organism responsible for Acanthamoeba keratitis in contact lens wearers?
Answer: Acanthamoeba castellanii
Acanthamoeba castellanii is the most common species causing this rare but severe corneal infection, often linked to rinsing lenses with tap water.
A contact lens patient asks about 'monovision.' Which description is most accurate?
Answer: One eye corrected for distance and the other for near
Monovision fits one eye (usually dominant) for distance and the other for near to address presbyopia without multifocal lenses.
Which instruction is most important to convey to a patient regarding contact lens case hygiene?
Answer: Replace the case every 1-3 months
Contact lens cases are a major source of microbial contamination and should be replaced every 1–3 months to reduce infection risk.
A soft contact lens with a diameter of 14.2 mm is considered:
Answer: Standard soft lens diameter
Most soft contact lenses range from about 13.8 to 14.5 mm in diameter, with 14.2 mm falling within the standard range.