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.

AberrationsPKP
Mean ± SD
(min–max)
DALK
Mean ± SD
(min–max)
Test

HOA3.24 ± 1.272.27 ± 0.96t>0.05
(μm)(1.407–5.8)(0.191–4.01)

Coma1.98 ± 1.511.67 ± 0.82U>0.05
(μm)(0.249–5.635)(0.206–3.057)

Trefoil1.73 ± 1.11.48 ± 0.39t>0.05
(μm)(0.292–3.47)(0.325–1.708)

Tetrafoil0.51 ± 0.220.58 ± 0.34t>0.05
(μm)(0.23–1.03)(0.022–1.327)

Spherical-like1.04 ± 0.391.09 ± 0.58t>0.05
(μm)(0.143–1.592)(0.173–2.502)

HOAst0.46 ± 0.210.36 ± 0.33U>0.05
(μm)(0.07–0.801)(0.078–1.628)

PSF3.17e−03 ± 1.99e−035.17e−03 ± 5.86e−03U>0.05
(Strehl ratio)(0.001–0.008)(0.001–0.027)

MTF7.6e−02 ± 1.01e−028.52e−02 ± 2.09e−02t>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. is statistically significant.