Also referred to as nearsightedness, myopia typically begins early in life. People with this condition can usually see near objects, but they struggle to see distant objects. In myopia, the anatomy of the eyeball is longer than normal. This causes the light to focus in front of the retina, blurring the distance vision. Myopia is corrected with glasses and contact lenses, or with laser vision correction, all of which move the focal point of incoming light backwards to the retina. Laser vision correction is only recommended for people over 18 years old, when the eye has finished growing to adult size. High myopic prescriptions may not stabilize until the late twenties.
To correct the symptoms of myopia with glasses, lenses are used that are thicker on the edges and thinner in the middle. This is known as a concave lens, which can be cosmetically improved in higher prescriptions with a high index lens material and aspheric lens designs.
Moderate to high myopes are also at increased risk of retinal detachment due to the elongated eye. The signs and symptoms of a retinal detachment are flashing lights, persistent black floaters, or a curtain over the vision from any direction.