TABLE 3.
Vector analysis of keratometric astigmatism after femto Z8 FLACS and FSAK using the alpins method.
| Vector Analysis Parameters | Pair FSAKs | ||||
|---|---|---|---|---|---|
| Total (n = 80) | Total (n = 49) | WTR group (n = 34) | ATR group (n = 15) | Single FSAK (n = 31) | |
| TIA Arithmetic mean ± SD, D Range, D | 0.92 ± 0.44 0.2 to 2.3 | 0.93 ± 0.35 0.4 to 1.8 | 0.91 ± 0.34 0.5 to 1.8 | 0.99 ± 0.39 0.4 to 1.6 | 0.89 ± 0.57 0.2 to 2.3 |
| SIA Arithmetic mean ± SD, D Range, D | 0.95 ± 0.60 0.1 to 2.69 | 0.89 ± 0.54 0.1 to 2.57 | 0.72 ± 0.41 0.1 to 2.07 | 1.26 ± 0.61 0.33 to 2.57 | 1.05 ± 0.69 0.23 to 2.69 |
| DV Arithmetic mean ± SD, D Range, D | 0.61 ± 0.45 0 to 2.0 | 0.47 ± 0.30 0 to 1.3 | 0.46 ± 0.24 0.1 to 1.2 | 0.49 ± 0.40 0 to 1.3 | 0.83 ± 0.56 0.1 to 2.0 |
| CI Arithmetic mean ± SD Geometric mean Range | 1.17 ± 0.80 0.94 0.11 to 3.97 | 0.96 ± 0.51 0.84 0.17 to 3.17 | 0.80 ± 0.37 0.71 0.17 to 1.64 | 1.31 ± 0.63 1.21 0.67 to 3.17 | −0.16 ± 0.89–1.99 to 1.77 |
| ME Arithmetic mean ± SD, D Range, D | −0.03 ± 0.65–2.35 to 1.61 | 0.05 ± 0.43–1.27 to 1.15 | 0.19 ± 0.34–0.57 to 1.15 | −0.27 ± 0.45–1.27 to 0.2 | 1.50 ± 1.04 1.14 0.11 to 3.97 |
| AE Arithmetic mean ± SD, ° Range, ° | 1.00 ± 16.38–41.50 to 58.87 | −1.78 ± 13.97–41.50 to 27.07 | −2.69 ± 15.80–41.50 to 27.07 | 0.29 ± 8.60–15.96 to 14.57 | 5.39 ± 19.04–19.56 to 58.87 |
| Absolute AE Arithmetic mean ± SD, ° Range, ° | 11.43 ± 11.72 0 to 58.87 | 9.54 ± 10.27 0 ± 41.5 | 10.88 ± 11.63 0 ± 41.5 | 6.49 ± 5.37 0 to 15.96 | 14.41 ± 13.33 0 to 58.87 |
| FI Arithmetic mean ± SD, D Range, D | −1.03 ± 0.84–3.89 to 0.61 | −0.87 ± 0.54–3.13 to −0.03 | −0.70 ± 0.39–1.62 to −0.03 | −1.26 ± 0.62–3.13 to -0.67 | −1.28 ± 1.14–3.89 to 0.61 |
| WTW-ATW Arithmetic mean ± SD, ° Range | −0.86 ± 0.63–2.67 to 0.18 | −0.82 ± 0.55–2.55 to −0.02 | −0.64 ± 0.43–2.01 to −0.02 | −1.21 ± 0.60–2.55 to −0.32 | −0.93 ± 0.74–2.67 to 0.18 |
TIA, target induced astigmatism; SIA, surgically induced astigmatism; DV, difference vector; ME, magnitude of error; CI, correction index; AE, angle of error; Absolute AE, absolute angle of error; FI, flattening index; WTW-ATW, net corneal change induced by the incision; SD, standard deviation.