What is refraction?
The cornea is the part of the eye that helps focus light rays to allow sharp and focused images to appear on the retina (in the back of the eye). It functions much like camera lens that focuses entering light rays to create an image on the film. The bending and focusing of the light is called refraction.
What is a refractive error?
With normal vision the eye refracts the light, making it focus in the right point on the retina. But several people do not have a perfect curvature of the cornea and the image that appears on the retina is out of focus (blurred) or distorted. These light focusing errors are called refractive errors.
What are the primary refractive errors?
There are three types of primary refractive errors: myopia, hyperopia and astigmatism. For people with myopia or near-sightedness it is more difficult to see distant objects clearly than to see object located nearby clearly. For people with hyperopia or farsightedness, seeing nearby objects clearly is more difficult than viewing distant ones. Astigmatism is a distortion of the image that appears on the retina due to irregular curvature of the cornea or the lens. People with a vision error usually have a combination of myopia and astigmatism or hyperopia and astigmatism.
How can refractive errors be corrected?
Glasses or contact lenses have been developed to compensate for the deficiencies in the eye function. The focusing of the eye can also be improved by a surgical procedure. Such surgery is called refractive surgery. KSA performs one type of eye surgery: Flow no-contact no-cut laser eye surgery. With this method, a small amount of tissue is removed from the cornea with a special laser and the cornea is then reshaped to improve eye focusing.
For more information on eye surgery, please explore the pages of our website, or contact our clinic. You can also get a personalized view of the benefits of laser eye surgery by viewing our patient testimonial videos.