Primary objective of this lecture is to present on Human Eye: Hyperopia and Myopia. The human eye is a fluid-filled object that focuses images of objects on the retina. The cornea, with an index of refraction of about 1.38, is where most of the refraction occurs. Some of this light will then passes through the pupil opening into the lens, with an index of refraction of about 1.44. The lens is flexible and the ciliary muscles contract or relax to change its shape and focal length.