Current Course Topic:
Myopia (nearsightedness) is a very common condition affecting distance vision (seeing things that are far away). The light that enters the eye through the cornea and the crystalline lens is bent in such a way that the resulting image focuses not on the retina (the light-sensitive inner wall at the back of the eye), but in front of it.
Corrective lenses (glasses or contact lenses) are used to improve myopia.
Hyperopia, also known as farsightedness, causes the individual to have difficulty seeing close objects. The eye focuses light behind the retina, instead of directly on the retina, thus causing the blurry near vision.
Eyeglasses are able to correct a person's near vision.
Presbyopia (farsightedness) affects close-up vision (seeing things that are near). The light entering the cornea and crystalline lens is bent so that the image focuses behind the retina, causing a distorted image to be transmitted to the retina and then to the brain.
Wearing corrective lenses (glasses or contact lenses) improves presbyopia.
