When it comes to knowing more about the eye, you would see that there are many types of eye problems. Some are common and can be treated, while others are sight-threatening and not so easily corrected or overcome.
Short sightedness (myopia) and long sightedness (hypermetropia) are common conditions that can be overcome by wearing glasses. Both are caused when the cornea and lens do not focus properly on the retina. A short-sighted person’s near vision is clear, but distant objects appear blurred. It occurs when the eyeball is elongated or the lens is too thick, causing the image to focus in front of the retina. A long-sighted person’s distant vision is clear, but nearby objects appear out of focus. It occurs when the eyeball is too short or the lens too thin, causing the image to focus behind the retina.
Sight-threatening conditions are not so easily corrected or overcome. These include cataract, trachoma, glaucoma and river blindness, and can cause complete blindness if left untreated. To know more about the eye and these diseases click hereSightopedia