PURPOSE: To assess keratometric changes after trabeculectomy (TE), Ex-PRESS shunt (EXP) and Ahmed glaucoma valve (AGV) implantation. METHODS: The study included 196 patients divided in 3 groups: TE group (n=116), EXP group (n=28) and AGV group (n=52). Each patient underwent keratometry (Topcon-8800) and corneal topography (Tomey RT-7000) proir to the surgery, 1 month and 6 months after intervention. Preoperative and postsurgical data were compared to assess keratometric values changes. RESULTS: Corneal astigmatism (CA) magnitude increased by 0.3 D 6 months after TE and EXP. There was a significant correlation between CA magnitude and uncorrected visual acuity (UCVA) in TE and EXP groups (r=-0.497, p=0.002; r=-0.405, p=0.006, respectively). AGV implantation did not lead to significant changes in CA 6 months after TE. EXP implantation decreased flat meridian from 44.28±1.01 to 44.0±1.09 D (p=0.002). There was a decrease of flat corneal meridian from 43.59±1.04 to 43.44±1.19 D (p=0.036), as well as a change of t