Dr. Laurence I. Miller
Nearsightedness occurs when the eye is too long for the focusing system and rays of light are focused in front of the retina. Glasses or contact lenses refocus light onto the retina.
Farsightedness occurs when the cornea of the eye has too little curvature and causes the light to focus behind the retina. Glasses or contact lenses refocus light onto the retina.
Is a condition where the front of the cornea is not uniformly curved, it is slightly oval in shape. As a result, the rays of light that enter the eye are bent unequally and cause distortion of the image. Most people have some degree of astigmatism.