ALK is used to treat low to moderate levels of farsightedness. A version of this procedure has been performed since 19A9. ALK became a mainstream refractive surgery procedure in 1990 with the development of an instrument called the automated microkeratome. With this instrument, which is designed like a carpenter’s plane, the doctor creates a corneal flap, revealing the inner corneal tissue. Pressure inside te3h eye causes the cornea to steepen. The flap is then folded back into position without the removal of additional tissue. This procedure has been performed at the Rothchild Eye Institute since 1992.