The original state of the lens is transparent, but the lens becomes cloudy with age. The excimer laser produces an ultraviolet beam of light which is emitted in pulses. It would take about 200 pulses from an excimer laser just to cut a human hair in half. The excimer laser has been used in industry since 1971 and has been used in ophthalmic surgery since 1983. The degree to which a visual error interferes with a person's ability to perform normal daily activities, such as reading, driving at night, or performing hobbies.
Light strikes the retina before it can come to a sharp focus.
Even though they are very small, thier mass is enough to change the shape of the front surface of the eye and correct refractive error. A plastic lens that may be surgically implanted to replace the natural lens of the eye. There are numerous styles of IOLs, including foldable IOLs and multifocal IOLs. The ophthalmologist uses the automated microkeratome to shave off a thin, hinged layer of the cornea. The surgeon then uses the excimer laser to vaporize a thin layer of the underlying cornea, and the top flap is restored to its place.