Physiology The refractory power of eye is normally 59 diopters. Two-thirds of this is contributed by A Anterior surfaceofthe lens B Posterior surface of the lens C Anterior surface of the cornea D Aqueous humor and vitreous humor combined 💡 Explanation The refractory power of eye is normally 59 diopters. Two-thirds of this is contributed by ✓ Correct Answer: C. Anterior surface of the cornea