Table 4.
Postoperative comparison of corneal aberrometry and optical quality of consecutive eyes that underwent deep anterior lamellar keratoplasty (fluid dissection) or penetrating keratoplasty for keratoconus.
| Aberrations | PKP Mean ± SD (min–max) |
DALK Mean ± SD (min–max) |
Test | P |
|---|---|---|---|---|
| HOA | 3.24 ± 1.27 | 2.27 ± 0.96 | t | >0.05 |
| (μm) | (1.407–5.8) | (0.191–4.01) | ||
|
| ||||
| Coma | 1.98 ± 1.51 | 1.67 ± 0.82 | U | >0.05 |
| (μm) | (0.249–5.635) | (0.206–3.057) | ||
|
| ||||
| Trefoil | 1.73 ± 1.1 | 1.48 ± 0.39 | t | >0.05 |
| (μm) | (0.292–3.47) | (0.325–1.708) | ||
|
| ||||
| Tetrafoil | 0.51 ± 0.22 | 0.58 ± 0.34 | t | >0.05 |
| (μm) | (0.23–1.03) | (0.022–1.327) | ||
|
| ||||
| Spherical-like | 1.04 ± 0.39 | 1.09 ± 0.58 | t | >0.05 |
| (μm) | (0.143–1.592) | (0.173–2.502) | ||
|
| ||||
| HOAst | 0.46 ± 0.21 | 0.36 ± 0.33 | U | >0.05 |
| (μm) | (0.07–0.801) | (0.078–1.628) | ||
|
| ||||
| PSF | 3.17e−03 ± 1.99e−03 | 5.17e−03 ± 5.86e−03 | U | >0.05 |
| (Strehl ratio) | (0.001–0.008) | (0.001–0.027) | ||
|
| ||||
| MTF | 7.6e−02 ± 1.01e−02 | 8.52e−02 ± 2.09e−02 | t | >0.05 |
| (A/D) | (0.063–0.1) | (0.067–0.147) | ||
HOA = higher-order aberrations; HOAst = high-order astigmatism; PSF = point spread function; MTF = modulation transfer function; DALK = deep anterior lamellar keratoplasty (fluid dissection); PKP = penetrating keratoplasty; t = T-test; U = Mann–Whitney U test. P < 0.05 is statistically significant.