Clinical Study

Polar Value Analysis of Corneal Astigmatism in Intrastromal Corneal Ring Segment Implantation

Table 3

Subgroup analysis.

Thickness (m)Number⁢Preoperative polar value (D)⁢Postoperative polar value (D)⁢Polar value change (D)Preoperative keratometry (D)Postoperative keratometry (D)Keratometry change (D)
AKP(+0)AKP(+45)AKP(+0)AKP(+45)ΔAKP(+0)ΔAKP(+45)

35035.77 ± 2.5606.80 ± 2.420.49 ± 1.001.03 ± 0.700.49 ± 1.0049.02 ± 0.8846.93 ± 0.81−2.08 ± 1.53
40087.33 ± 4.4005.49 ± 4.88−1.19 ± 1.56−1.83 ± 1.69−1.19 ± 1.5649.93 ± 3.1047.74 ± 1.86−2.18 ± 2.00
450237.47 ± 3.4005.81 ± 4.39−0.39 ± 2.86−1.66 ± 3.15−0.39 ± 2.8655.87 ± 4.6551.27 ± 5.34−4.60 ± 1.74