Why is more refractive power of lens required to view near objects than distant objects from the eye? - Quora
optics - the power of a lens and radius of curvature relation - Physics Stack Exchange
Surface Power for a Lens
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Dr. Jie ZouPHY The Human Eye Fundamental elements of an eye: –Cornea: light enters the eye through the transparent outer coating of the eye. –Aqueous. - ppt download