Intraocular Pressure After Excimer Laser Photorefractive Keratectomy for Myopia

Abstract

ABSTRACT BACKGROUND: Pressure measurements after excimer laser photorefractive keratectomy (PRK) might be inaccurate. Measuring the pressure in the temporal part of the cornea might give more representative results. METHODS: Intraocular pressure was measured with the Goldmann applanation tonometer in each eye in the central and temporal parts of the cornea. Measurements were performed in a group of 64 treated eyes before treatment as well as 1, 3, 6, 9, and 12 months thereafter; 35 eyes could be followed up for 1 year. Two groups of nontreated eyes served as controls. The paired Student's t test was used for statistical analysis. RESULTS: Central and temporal measurements were identical before treatment. After PRK, central values were 2 to 3 mm Hg lower than temporal values. Significant differences were observed from 1 month to 1 year of follow up (p<0.0001). CONCLUSIONS: The intraocular pressure measured in the central part of the cornea after PRK for myopia is lower than that measured in the corneal periphery, due probably to the absence of Bowman's layer and to central thinning. [J Refract Surg. 1995;11:366-370.]