Laser Assisted in situ keratomileusis (LASIK) has an effect on ocular surface, tear film production, and corneal sensation, so surgery can induce dry eye disease or worsen an existing one. All patients experience eye dryness after refractive surgeries at least transiently. Although good visual acuity after LASIK, quality of life is affected by dry eye disease.Normal ocular surface microenvironment (OSM) is essential for healthy ocular surface. Any change of its components affect the homeostasis of the ocular surface leading eventually to lacrimal function unit dysfunction causing dry eye.There are many clinical signs present in Post LASIK dry eye .If post LASIK dryness become chronic it may affect vision and cause refractive regression. The management is the same as treating dry eye disease.
The treatment: is temporary for most patients but some patients need to continue for long time.

AIM OF THE WORK:
The work aimed to correlate between the ocular surface changes and central corneal thickness after LASIK, using the ocular surface analyzer OSA.