The crystalline lens of a normal human eye has radii of curv

The crystalline lens of a normal human eye has radii of curvature 10.2 and 6 mm, is convex, and has a thickness of 2.4 mm. The refractive index varies with position but may be taken as 1.386. Determine the optical power and focal length, recognizing that in vivo the lens is immersed in ocular fluid. We remark that “crystalline” in this context is an anatomical term that means transparent; it does not mean the lens has a regular atomic arrangement. The lens is actually fibrous.

Solution

The optimum power for the crystalline lens for human eye is 6 , while focal length for the same parameter is 3.4m