Intrastromal Corneal Ring Segment Implantation (Keraring 355°) in Patients with Central Keratoconus: 6-Month Follow-Up

Table 4

Comparison between preoperative and 6-month postoperative values.

	Preoperative	6-month postoperation	value
value (D)
Mean (SD)	50.39 (2.14)	44.22 (2.17)	<0.001^**
value (D)
Mean (SD)	45.85 (1.94)	42.14 (2.53)	<0.001^**
value (D)
Mean (SD)	48.11 (1.95)	43.31 (2.31)	<0.001^**

Note: SD: standard deviation; D: diopter; significances are based on paired -test. < 0.01. : minimum curvature; : maximum curvature; : mean curvature.