الفهرس 
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Abstract
The aim of this study is to evaluate anterior segment changes with pentacam after pars plana vitrectomy with silicone oil injection or without tamponade.
Forty patients were enrolled in this prospective non-randomized study. They were recruited from the outpatient clinic of Ophthalmology Department, El-Minia University Hospital. All patients had vitreoretinal disease requiring primary pars plana vitrectomy. Pediatric patients, patients with history of intraocular, corneal, refractive or scleral buckling surgery were excluded. Patients with concomitant significant cataract, corneal disease, or extreme K readings were also excluded.
The patients were equally divided into 2 groups: group A; undergoing 23-gauge vitrectomy with silicone oil tamponade, and group B; undergoing 23-gauge vitrectomy without tamponade. group A included 12 males and 8 females, and age ranged from 16 to 68 years. group B included 10 males and 10 females. Age ranged from 20 to 69 years.
Surgeries were performed between november 2014 and november 2015. Pentacam scan was done for all patients preoperatively, one month and three months postoperatively.
We found a statistically significant difference (P value <0.05) between the 2 groups regarding pachymetry apex. 23-gauge vitrectomy with silicone oil tamponade induced increase in corneal thickness ,while 23 –guage vitrectomy without tamponade induced decrease in corneal thickness.
We also found that 80% of cases of group A developed cataract postoperatively,while 20% of cases of group B developed cataract postoperatively.
In both groups, anterior chamber volume and anterior chamber depth decreased.
Regarding group A: there was stastically significant difference between pre operative data and post operative data (after 3 months) as regards front K1and front K2
There were stastically significant difference between preoperative data and post operative data(after 1 month) as regards pachymetry apex.
There were stastically significant difference between preoperative data and postoperative data (after 1 month, after 3 months)as regards ACV .
Other results were stastically non significant
Regarding group B:
There was stastically significant difference between preoperative data and postoperative data (after 1 month, after 3 months) as regards front k1,front astigmatism,back k1,back astigmatism,pachymetry apex, thinnest location,ACV and ACD.
Other results were stastically non significant.