The two main defects of the human eye are myopia, which is nearsightedness, and hyperopia, which is farsightedness; both myopia and hyperopia can be treated by wearing glasses. Another major defect is when the curvature ... More »

Eye defects are problems or malfunctions in a certain part of the eye. According to Hyperphysics, common vision defects include farsightedness, nearsightedness and astigmatism. Other eye defects include glaucoma, catarac... More »

The average human eye blinks approximately once every four to six seconds, or 15 to 20 times a minute. However, the frequency varies under different conditions. Blinking tends to decrease during times of concentration an... More »

The iris of the human eye is the pigmented portion of the eye. It is visible through the outermost layer of the eye, or the cornea. The iris is comprised of connective tissue and smooth muscle fibers. More »

The resolution limit of the human eye is 5*10^(-4) radians for most people. The Raleigh criterion is generally used to dictate the resolution limit of an imaging system, however, biology is also a factor, so the eye's ac... More »

The cornea, sclera, pupil, iris and conjunctiva glands are some of the parts of the human eye. Other parts include the lacrima glands, lens, retina and ciliary body. More »

Although the curvature of the Earth's surface causes objects to be out of sight within 3.1 miles, the farthest object visible to the naked eye is the Andromeda galaxy, located 2.6 million light-years away from Earth. The... More »