[An analysis about the safe range of thickness of the residual corneal stroma bed after LASIK].

Objective: To ascertain the safe range of thickness of the residual corneal stroma bed and the length of stable time after LASIK operation.

Methods: Two hundred and twenty seven eyes were randomly selected from cases treated with LASIK in 2000. The posterior curvature of cornea was measured by Obscan II preoperatively and 1, 2, 3, 6 months, 1 year and 2 year postoperatively.