الفهرس 
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Abstract
Deep anterior lamellar keratoplasty (DALK) is a lamellar corneal graft technique, alternative to penetrating keratoplasty (PK), in patients with healthy endothelium.
The advantages of DALK compared to PK include a reduced risk of endophthalmitis, expulsive haemorrhage, anterior chamber lesions, and reduced risk of endothelial cell loss.
The endothelial cell loss after penetrating keratoplasty is found to be at a higher rate than the physiologic rate, but with DALK, loss of endothelial cells appears to be similar to the physiological loss.
The objective of this study was to evaluate the endothelial cell loss following deep anterior lamellar keratoplasty (DALK) using the bigbubble technique (BB) and the microbubble technique (MB) by using a topcon SP2000p non-contact specular microscope.
The study was carried out on 20 eyes. The patients were divided into two groups: groupI, 11 eyes were operated by the bigbubble technique, and groupII, 9 eyes were operated by the microbubble technique.
The patients were examined preoperative and three months postoperative.
The result revealed that:
Comparison of the two studied groups regarding age, sex, refraction, keratometric readings and specular microscope was statistically nonsignificant.
According to endothelial cell loss there was no statistically significant differences between BB and MB regarding the specular microscopy preoperative results (P=0.281).
The percentage of endothelial cell loss for the BB group was 3.34 ± 3.94% from preoperative to postoperative readings and the percentage of endothelial cell loss for the MB group was 6.78 ± 6.13 % from preoperative to postoperative readings.