<prompt> Most powerful refractory surface of eye is -ConjunctivaCorneaVitreousLens  <response>: Ans. is b i.e., Cornea o The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two- thirds of the eyes total optical power.o In humans, the refractive power of the cornea is approximately 43 dioptres.o The diopteric power of reduced eye is 60D, of which 44D is contributed by cornea and 16D by the crystalline lens.o Total diaopteric power of schematic eye is 58D, of which cornea contributes 43D and the lens 15D. 