This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Elementary Optics, Subject name: Ophthalmology
Spectacle shown below is used in 
Select and explain. 
A. Bifocal for presbyopia, B. Bifocal for adult aphakia, C. Bifocal for pediatric aphakia, D. Progressive bifocal for presbyopia
C: Bifocal for pediatric aphakia
Answer: C: Bifocal for pediatric aphakia 
Explanation: Ans. (c) Bifocal for pediatric aphakiaRef: Diagnosis and Management of Ocular Motility Disorders by Alec M. Ansons, Helen Davis 3/e, p. 36These are straight type/ executive type bifocals with a central lie dissecting the visual axis, such that the top of the reading segment passes just below the middle of the pupil when the eye is in the primary position. Indicated in*Aphakia in children*As low vision aids in children*In selected cases of treatment od accommodative esotropia with convergence excessBifocals preferred in presbyopia/adults are usually D shaped