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Ophthalmology

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Refraction and Optics

Question
1 out of 41
 

"Jack in the box" phenomenon is because of: (AIPG 2011)



A Loss of accommodation

B Reduced visual acuity

C Prismatic deformity

D Spherical aberration

Ans. C Prismatic deformity

Difficulties of aphakia and its correction by spectacles are as under:

1. Spherical aberration producing a "pin cushion effect" Q

2. "Jack in the box" Q ring scotoma due to prismatic effects at the edge of lens

3. Prismatic errors Q due to displaced optical centers of the lenses

4. Reduced visual fields and poor eccentric acuity,

5. Aniseikonia if patient is using monocular aphakicplasses

Refraction and Optics Flashcard List

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