Best spectacle corrected VA (Snellen decimal) | 0.69 (0.34) | 0.00 to 1.20 | 0.63 (0.37) | 0.001 to 1.20 | 0.006 |
Surface regularity index (SRI) | 1.24 (0.83) | 0.10 to 4.59 | 1.24 (0.82) | 0.02 to 4.02 | 0.01 |
Standard deviation of power (SDP) | 3.80 (2.34) | 0.66 to 10.45 | 4.17 (2.59) | 0.84 to 11.45 | 0.03 |
Centre surround index (CSI) | 1.51 (2.26) | −1.66 to 7.84 | 1.55 (2.81) | −5.56 to 10.30 | 0.03 |
Surface asymmetry index (SAI) | 2.26 (1.84) | 0.25 to 9.45 | 2.45 (1.67) | 0.18 to 7.10 | 0.05 |
Differential sector index (DSI) | 8.30 (4.69) | 1.01 to 21.08 | 9.21 (5.51) | 1.84 to 22.94 | 0.13 |
Irregular astigmatism index (IAI) | 0.45 (0.19) | 0.20 to 1.26 | 0.47 (0.22) | 0.23 to 1.38 | 0.14 |
Central corneal power (K) | 46.79 (4.54) | 40.00 to 57.31 | 46.94 (4.96) | 38.69 to 58.84 | 0.16 |
Keratoconus predictor index (KPI) | 49.63 (41.20) | 0 to 100.00 | 53.24 (41.31) | 0.00 to 100.00 | 0.18 |
Average corneal power (ACP) | 45.86 (3.76) | 33.39 to 54.73 | 46.18 (4.26) | 39.95 to 57.50 | 0.18 |
Inferior minus superior power (I-S) | 5.74 (5.04) | −9.03 to 17.05 | 6.39 (4.83) | −4.12 to 18.17 | 0.18 |
Opposite sector index (OSI) | 7.11 (4.96) | 0.15 to 21.08 | 7.80 (5.52) | 0.10 to 22.94 | 0.22 |
Corneal eccentricity index (CEI) | −0.34 (0.63) | −0.96 to 0.95 | −0.28 (0.69) | −0.96 to 0.96 | 0.25 |
Area analysed (AA) | 0.66 (0.14) | 0.24 to 0.86 | 0.66 (0.15) | 0.23 to 0.89 | 0.38 |