NBEO Contact Lenses & Fitting 2

Question 1

Giant papillary conjunctivitis (GPC) is defined by papillae on the upper tarsal conjunctiva that are larger than:

Accepted Answer

1.0 mm

Answer

GPC is characterized by papillae larger than 1.0 mm on the upper tarsal conjunctiva, differentiating it from normal papillary response.

Question 2

Contact lens-induced acute red eye (CLARE) is most commonly associated with colonization by which category of organism?

Accepted Answer

Gram-negative bacteria

Answer

CLARE is most commonly associated with Gram-negative bacterial colonization of extended wear contact lenses, with endotoxins triggering the inflammatory response.

Question 3

Which contact lens-related complication presents with deep stromal infiltrates, significant anterior chamber reaction, mucopurulent discharge, and severe pain, representing the most vision-threatening condition?

Accepted Answer

Microbial keratitis

Answer

Microbial keratitis presents with deep stromal infiltrates, severe pain, and discharge, and represents the most serious and vision-threatening contact lens-related complication.

Question 4

Superior epithelial arcuate lesions (SEAL) are primarily caused by which mechanism?

Accepted Answer

Mechanical trauma from the edge of a soft contact lens

Answer

SEALs result from mechanical trauma where the upper eyelid forces the peripheral edge of a soft lens against the superior corneal epithelium, creating an arcuate split.

Question 5

Which exposure is considered the primary risk factor for Acanthamoeba keratitis in contact lens wearers?

Accepted Answer

Exposure to tap water or swimming while wearing lenses

Answer

Water exposure (tap water, swimming, showering with lenses) introduces Acanthamoeba to the lens environment and is the primary modifiable risk factor for Acanthamoeba keratitis.

NBEO - National Board of Examiners in Optometry Practice Test

NBEO - National Board of Examiners in Optometry Practice Test

NBEO Contact Lenses & Fitting 2