Purpose: To evaluate the change in central corneal thickness by ultrasongraphic pachymetry induced by corneal drying and to discuss its possible impact on intraocular pressure (IOP). Materials and Methods: 100 eyes of 100 outpatients who were >40 years old were not prescribed any topical medications had no history of intraocular surgery or eye disease had a visual acu- Purpose: To evaluate the change in central corneal thickness by ultrasongraphic pachymetry induced by corneal drying and to discuss its possible impact on intraocular pressure (IOP). Materials and Methods: 100 eyes of 100 outpatients who were> 40 years old were not prescribed any topical medications had no history of intraocular surgery or eye disease had a visual acu-