الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
In this study 90 eyes with senile immature cataract were selected from patients attending at Mansoura ophthalmic center for cataract surgery. selection was after full ophthalmic examination. Most cases were grade III nuclear hardening. The selected patients were randomly and equally classified into two groups undergone cataract extraction with phacoemulsification and in the bag IOL implantation. Each group consist of 45 patients: group 1: in which phaco surgery was done using divide and conquer technique. group 2: in which phaco surgery was done using stop and chop technique. All eyes were operated by the same phaco machine and same IOL type. Any case with intraoperative complications was excluded from the study. Post-operative evaluation and follow up to all patients was done at 1 week, 1month and 3 months. This include full ophthalmic examination and specular microscopy. Data collected from the cases were recorded such as: age, nuclear grading, preoperative CCT, ECC and post-operative CCT, ECC after 1 week, 1month and 3 months. Results in this study showed that there was no statistically significant difference between divide and conquer technique and stop and chop technique regarding endothelial cell count and central corneal thickness. Results in our study showed that there was no statistically significant difference between divide, conquer technique, stop, and chop technique regarding endothelial cell count and central corneal thickness. Concerning ECC, there was statistically significant endothelial cell loss throughout the study in the two groups as compared to preoperative values, but no significant difference between the two groups was recorded. The most significant decrease in endothelial cell count was at 1 week post-operative in both groups (about 7.1% in divide and conquer group and 4.7%.in stop and chop group as compared to pre-operative mean ECC). less endothelial cell loss occurs after 1 month in both groups and least decrease was after 3 months (about 9.9% in divide and conquer group and 8.7% in stop and chop group as compared to pre-operative mean ECC). Although less endothelial loss occur in stop and chop group (about 8.7%) when compared with divide and conquer group (about 9.9%) the difference was statistically insignificant. As regard mean CCT, there was statistically significant increase in both groups as compared to preoperative values. The most significant increase was at 1 week post-operatively (about 5.2% in divide and conquer group and 7.1% in stop and chop group as compared to pre-operative mean CCT). After 1 month there was less increase in mean CCT in both groups and least increase after 3 months (about 1.9% in divide and conquer group and 1.7% in stop and chop group as compared to pre-operative mean CCT ). Although more increase in mean CCT in stop and chop group (7.1%) when compared with divide and conquer group (about 5.2%) the difference was statistically insignificant. Conclusion : from this study, it is concluded that both divide and conquer and stop and chop phacoemulsification techniques are safe and effective. The difference between divide and conquer and stop and chop technique as regards endothelial cell count and central corneal thickness was statistically insignificant.