Optics and Refraction — Flashcards

Flashcard 121: _____ hypermetropia: Masked by the voluntary accomodative effort of the person

Answer: Facultative

Flashcard 122: When the total refractive power of the two eyes is unequal, the condition is called _____.

Answer: anisometropia

Flashcard 123: For retinoscopy, the surgeon sits at a distance of _____ or at an arm's length from the patient

Answer: 1 meter

Flashcard 124: _____ effect is seen in amblyopia as brightness is less compared to normal eye

Answer: Sunglass

Flashcard 125: Which color vision test uses pseudoisochromatic plates with symbols (circles, crosses, triangles) and is capable of detecting Tritan (blue-yellow) defects?

Answer: Hardy-Rand-Rittler (HRR) test

Extra: The HRR test uses pseudoisochromatic plates with symbols (circles, crosses, triangles) rather than numbers. Unlike the Ishihara chart, it can detect Tritan (blue-yellow) defects in addition to Protan and Deutan defects.

Flashcard 126: Contrast sensitivity is assessed using _____.

Answer: Pelli-Robson chart

Flashcard 127: _____ theory states that peculiar refractive index of corneal lamellae is responsible for the corneal transparency

Answer: Goldmann

Flashcard 128: Presbyopia is corrected by the use of a _____ lens

Answer: convex

Flashcard 129: Degenerative myopia is seen in more than _____ dioptres of myopia.

Answer: 6

Flashcard 130: At the given distance, each letter subtends an angle of _____ at the nodal point of the eye

Answer: 5 min