CO CO Optical Instruments & Diagnostic Equipment

Question 1

Which instrument is primarily used to measure the angle of deviation in strabismus by projecting a light onto each cornea?

Accepted Answer

Krimsky test

Answer

The Krimsky test uses a prism placed before one eye while observing corneal light reflexes to measure the angle of strabismic deviation.

Question 2

A synoptophore (amblyoscope) is BEST used to assess which of the following?

Accepted Answer

Binocular vision and fusion

Answer

The synoptophore is a major amblyoscope used to assess, measure, and treat binocular vision disorders including fusion and stereopsis.

Question 3

The Worth 4-dot test uses which colors to assess binocular fusion?

Accepted Answer

Red, green, and white

Answer

The Worth 4-dot test uses two green dots, one red dot, and one white dot, viewed through red-green glasses to assess binocular fusion.

Question 4

When using a prism bar to measure a horizontal deviation, the prism base direction should be oriented in which direction to neutralize an esotropia?

Accepted Answer

Base-out

Answer

Base-out prisms neutralize esotropia by shifting the image toward the deviated eye, allowing the cover-uncover test to show neutralization.

Question 5

The Maddox rod test is primarily used to measure which type of deviation?

Accepted Answer

Phorias and small tropias

Answer

The Maddox rod dissociates the eyes and measures the full extent of a phoria or small tropia by converting a point of light into a streak.

(CO) Certified Orthoptist Practice Test