1.   Both use a laser beam to deliver bursts of ultraviolet light to reshape the cornea.

2.   Commonly known as RK, it corrects vision by reshaping the cornea with tiny knife cuts that look like wagon-wheel spokes.

3.   In a procedure called astigmatic keratotomy, incisions are made in a curved pattern to reshape the cornea.

4.   In comparison, the eye lasers actually cut into the eye to reshape the cornea and improve vision.

5.   In the new operation, known as photorefractive keratectomy, the surgeon wields a laser rather than a knife to reshape the cornea.

6.   It scans the eye, gradually reshaping the cornea in several passes instead of one.

7.   Microscopic layers of the exposed tissue are vaporized with an excimer laser to slightly reshape the cornea.

8.   Now Ohio State researchers have developed lenses worn only at night that temporarily reshape the cornea.

9.   Or consider refractive surgery, in which the cornea is reshaped with a surgical instrument, laser or both.

10.   The lasers, used in eye surgery, reshape the cornea to correct nearsightedness and other vision problems.