Common Eye Disorders

Today universally most of the people facing from four common eye disorders they are:

• Nearsightedness: Generally known as scientifically as myopia, means that a person sees nearby objects more clearly than distant objects. It does not mean that a narrow-minded person has excellent near vision and poor distance vision. Enormously nearsighted people do not see anything clearly. In the normal eye, parallel rays of light passing through the cornea bend slightly and then bend again as they penetrate the lens to focus on a small, single spot on the retina.
• Farsightedness: Usually known as hyperopia, is the opposite of myopia. It is not necessarily the ability to see objects clearly at a distance and poorly close up, although this can be the case. In the farsighted eye, rays of light streaming through the cornea and lens reach the retina before they come into focus, creating a blurred image. In a sense, the eyeball is too short for the refractive power of its own optical system.
• Astigmatism: Generally astigmatism is a eye results from an imperfectly shaped cornea. The cornea of the astigmatic eye might be poorly curved from top to bottom or from side to side. This error of design gives the cornea different refractory powers across its length and width and distorts sight.
• Presbyopia: It is an optical flaw that eventually affects almost everyone. As the eyes age, their powers of accommodation decline. It becomes increasingly difficult for the eye to bring nearby objects into focus. An individual with presbyopia can also be farsighted, nearsighted, or astigmatic at the same time.