What is Astigmatism?
Astigmatism is a common vision condition that occurs when the cornea, the clear front surface of the eye, has an irregular curvature. This curvature prevents light from focusing properly on the retina, the light-sensitive tissue at the back of the eye, causing blurred vision. Astigmatism can occur in combination with other refractive errors such as nearsightedness and farsightedness.
What Causes Astigmatism?
Astigmatism is usually caused by the irregular shape of the cornea or the lens inside the eye. In some cases, astigmatism can be caused by an injury to the eye or a genetic condition. Astigmatism can also be caused by the shape of the eyelids, which can put pressure on the cornea and cause it to become misshapen.
Symptoms of Astigmatism
The most common symptom of astigmatism is blurry or distorted vision at all distances. Other symptoms can include headaches, eyestrain, and squinting. People with astigmatism may also experience difficulty seeing at night or difficulty reading small print.
Treatment for Astigmatism
Astigmatism can be treated with eyeglasses, contact lenses, or refractive surgery. Eyeglasses and contact lenses can correct astigmatism by changing the way light enters the eye, allowing the light to focus properly on the retina. Refractive surgery can reshape the cornea to correct the curvature and improve vision.