ABO Refraction & Visual Acuity

Question 1

What does a myopic patient experience without corrective lenses?

Accepted Answer

Blurred distance vision

Answer

Blurred near vision

Answer

Double vision at all distances

Answer

Color blindness

Question 2

Which instrument is used to objectively measure a patient's refractive error?

Accepted Answer

Autorefractor

Answer

Tonometer

Answer

Pachymeter

Answer

Keratometer

Question 3

A prescription reads -2.50 -1.00 x 180. What type of correction does this represent?

Accepted Answer

Compound myopic astigmatism

Answer

Simple hyperopic astigmatism

Answer

Mixed astigmatism

Answer

Simple myopia

Question 4

What is the Snellen fraction for a patient who can read the 20/40 line?

Accepted Answer

The patient sees at 20 feet what a normal eye sees at 40 feet

Answer

The patient sees at 40 feet what a normal eye sees at 20 feet

Answer

The patient has 40% vision loss

Answer

The patient needs +0.40 D correction

Question 5

Which lens power would be prescribed for a patient with +3.00 D of hyperopia?

Accepted Answer

Convex (plus) lens of +3.00 D

Answer

Concave (minus) lens of -3.00 D

Answer

Cylindrical lens of 3.00 D

Answer

Prism lens of 3.00 prism diopters

Question 6

What is the purpose of the Jackson Cross Cylinder during refraction?

Accepted Answer

To refine the axis and power of the cylinder correction

Answer

To measure intraocular pressure

Answer

To evaluate color vision

Answer

To assess pupil dilation