Materials and methods: A total of 64 eyes of 64 patients having 23 gauge (G) PPV without endotamponate were enrolled in this study. Group I consisted of 32 phakic patients and Group II consisted of 32 pseudophakic patients. By using an optical biometry approach, ACD and CCT values were measured preoperative as well as postoperative 1^st and 6^th months following uncomplicated PPV.

Results: In Group I, mean preoperative ACD was 2.82±0.41mm, mean postoperative 1^st month ACD was 2.72±0.37 mm; mean postoperative 6^th month ACD was 2.61± 0.35 mm. In Group II, mean preoperative ACD was 3.53±0.25 mm, whereas the mean postoperative 1st month and 6th month ACD values were 3.51±0.31 mm and 3.39± 0.27 mm, respectively. In both groups; decrease in ACD measurements were signifi cant at postoperative 1^st month and 6^th months with respect to preoperative ACD (p<0.05). Group II had higher ACD values at each measurement time (p<0.05). In both groups, there was not a signifi cant change of CCT in preoperative, postoperative 1^st and 6^th months measurements (p>0.05). There was not a signifi cant CCT difference between two groups at each measurement time (p>0.05).

Conclusion: ACD measurements decreased and CCT measurements did not change signifi cantly at the 1^st and 6^th months measurements with respect to the preoperative measurements. But further studies are required for more information. Keywords : Anterior chamber depth, central corneal thickness, lens thickness, optical biometry, pars plana vitrectomy