For people needing a very large amount of visual correction, a procedure called Laser In Situ Keratomileusis (LASIK) may be the best way to achieve clear, natural vision. This procedure had its origins back in the 1960's and has evolved over the years into a safe and effective operation. The current technique involves both the use of conventional and laser surgery to correct nearsightedness, farsightedness and astigmatism.

In performing LASIK, the surgeon first uses a special oscillating blade to make a partial cut through 1/4 to 1/3 of the front surface of the cornea, creating a flap of clear tissue on the central part of the eye.

The patient is then positioned under the excimer laser which has been programmed to vapourize away some of the internal corneal tissue under the flap. Central tissue is removed to reduce curvature and correct nearsightedness.

Peripheral tissue is removed to increase curvature and correct farsightedness. Astigmatism can be corrected by removing selected tissue to even out the curvature of the cornea.

After the laser has removed the selected tissue, the flap is closed over the eye. The corneal tissue has extraordinary natural bonding qualities that allow effective healing without the use of stitches.

The entire procedure takes only about 25 minutes, but a comprehensive examination and consultation are necessary before surgery. Patients remain awake with only the designated eye anaesthetised with drops. Good vision is often possible on the day following the surgery. Eye drops and night protection are necessary for designated periods of time.