Lasik surgery is a surgical procedure to correct vision. Because laser vision correction is not covered by Medicare, Medicaid, or most private insurance plans, consumers must pay directly out of pocket for such surgeries. As a result, demand for LASIK tends to be heavily correlated with economic conditions, especially in the U.S. A weak or uncertain economy can decrease sales in the laser vision correction division. Furthermore, concerns about the safety of LASIK procedures have increased over the last few years. Some studies have found that as many as 18% of LASIK patients need retreatment.  The negative publicity resulting from such findings, as well as media coverage of individual negative experiences with LASIK add another downward pull to already weakened demand. Consequently, laser vision correction has been a flat market for the past few years, with roughly the same number of LASIK procedures performed each year (see chart below). 
A number of companies make LASIK surgery equipment, which they sell to doctors who then charge patients to perform the procedure.