JCAHPO Patient Evaluation 5

Question 1

When recording best-corrected visual acuity as 20/40, this means the patient can see at 20 feet what a person with normal vision can see at:

Accepted Answer

40 feet

Answer

The denominator represents the distance at which a normally sighted person can resolve the same letter that the patient resolves at 20 feet.

Question 2

Pachymetry is performed in the preoperative evaluation for LASIK primarily to measure:

Accepted Answer

Central corneal thickness

Answer

Central corneal thickness measured by pachymetry is critical to ensure adequate residual stromal bed after refractive ablation, minimizing ectasia risk.

Question 3

A patient with diabetes presents for a dilated fundus exam. Which pupillary dilation agent is most appropriate to use when a short duration of dilation is preferred?

Accepted Answer

Tropicamide 1%

Answer

Tropicamide 1% provides rapid, short-acting dilation (4–6 hours) and is the preferred agent when prolonged cycloplegia is undesirable.

Question 4

When performing the swinging flashlight test, a relative afferent pupillary defect (RAPD) is present when the illuminated pupil:

Accepted Answer

Dilates or shows less constriction when the light swings to that eye

Answer

An RAPD (Marcus Gunn pupil) is identified when the pupil paradoxically dilates as the light swings from the normal eye to the affected eye, indicating reduced afferent input.

Question 5

Which instrument is used at the slit lamp to measure the anterior chamber angle and requires a contact lens?

Accepted Answer

Gonioscope

Answer

Gonioscopy uses a mirrored contact lens to redirect the view, allowing visualization of the trabecular meshwork and anterior chamber angle structures.

(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test

(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test

JCAHPO Patient Evaluation 5