ABO Refraction & Visual Acuity 2

Question 1

What is the term for the condition where one eye has a significantly different refractive error than the other?

Accepted Answer

Anisometropia

Answer

Anisometropia is a condition where there is a significant difference in refractive error between the two eyes, which can lead to amblyopia if uncorrected.

Question 2

Which type of lens is used to correct presbyopia?

Accepted Answer

Convex (plus) lens for near addition

Answer

Presbyopia is corrected with a plus (convex) add power for near vision, compensating for the loss of accommodation with age.

Question 3

A patient's vertex distance changes from 12mm to 14mm. How does this affect the effective power of a minus lens?

Accepted Answer

The effective power decreases

Answer

Moving a minus lens farther from the eye (increasing vertex distance) decreases its effective power at the corneal plane.

Question 4

What is the typical working distance used for near visual acuity testing?

Accepted Answer

40 cm (16 inches)

Answer

The standard near testing distance is 40 cm (16 inches), which corresponds to a 2.50 D accommodative demand.

Question 5

In retinoscopy, a 'with' motion of the reflex indicates what type of refractive error?

Accepted Answer

Hyperopia or insufficient minus correction

Answer

A 'with' motion during retinoscopy indicates that the eye is hyperopic or has insufficient minus power, requiring additional plus power to reach neutralization.

ABO - American Board of Optometry Practice Test

ABO - American Board of Optometry Practice Test

ABO Refraction & Visual Acuity 2