**5. Conclusions**

8 Keratoplasties – Surgical Techniques and Complications

**19**(15.83%) 25(20.83%) 76(63.34%)

keratoconus. Similar to this finding, studies in Nakorn hospital (17)showed that The leading indications for penetrating keratoplasty, in order of decreasing frequency, were bullous keratopathy (28.9%), corneal scar (22.2%), corneal dystrophy and degeneration (20.0%), corneal ulcer (17.8%), re-graft (8.9%), and trauma (2.2%)(17). In other words, pseudophakic bullous keratopathy and corneal scar were the most common indications (17). In the study in French in 2001 pseudophakic bullous keratopathy (27.7%), keratoconus (25.3%), was the most common indication (18). In Atlanta in 2001 study showed reoperative graft (29.1%), bullous keratopathy (21.5%), keratoconus (23%), corneal scar (19%), was the most common indication (19). In the study in Iran (Teaching Hospital of Medical yazd University) between 1992 and 1996, The most common indication for PK was keratoconus (31%), corneal scar

**Age groups 11-25 26-45 Up to 46** 

**Corneal locuma** (15%)3 (54.55%)12 (76.92%)60 **Keratoconus** (75%)15 (31.82%)7 (1.28%)1 **The else** (7.10%)2 (13.63%)3 (21.80%)17 **Total** (100%)20 (100%)22 (100%)78

P=0/001 df=4 value=40/234

Table 4. Comparison of cause of PK in age groups

**Number**

**Cause of pk** 

Corneal scar and Keratoconus is the most common indication for PK in teaching hospitals of Birjand Medical University, Iran. These findings were in agreement with data reported in recent literature in Iran.
