Visual Acuity and Contrast Sensitivity — Flashcards

Flashcard 1: Myopia must never be _____-corrected with spectacles.

Answer: over (under/over)

Flashcard 2: Contrast sensitivity is assessed using _____.

Answer: Pelli-Robson chart

Flashcard 3: Moderate myopia, when the error is _____D.

Answer: -3 to -6

Flashcard 4: The total refractive power of the human cornea is approximately: _____ D

Answer: 43

Extra: • Total refractive power of the eye (Reduced eye): 60 D • Corneal power: +43 D (approx. 2/3 of total power) • Lens power: +15 to +19 D (approx. 1/3 of total power) Note: In the 'Reduced Eye' model, the eye is simplified to a single refracting surface with a total power of 60 D. The value 43 D specifically refers to the cornea in a standard schematic eye.

Flashcard 5: Low myopia is defined as a refractive error of ≤ _____ D.

Answer: 3

Flashcard 6: The following retinoscope is also called _____

Answer: Priestley Smith retinoscope

Flashcard 7: What is the name of the following test used for testing colour vision? _____

Answer: City university test

Flashcard 8: _____ is used to test color vision

Answer: Nagel’s anomaloscope

Flashcard 9: Stenopaeic slit can be used to determine the axis of the cylinder in _____.

Answer: astigmatism

Flashcard 10: _____ test is based on chromatic aberration and is used to refine the final sphere in subjective refraction

Answer: Duochrome