Thus, given mean internal HOAs of −0.57 μm in PK, −0.92 μm in DALK and −0.12 μm in DMEK, the actual impact of posterior HOAs on visual quality in DMEK patients was probably not significant. 33 , 34 These results, which are in agreement with previous reports, 21 are not unexpected, as the change in refractive index between the posterior cornea and the aqueous humor is smaller than the change occurring at the anterior surface between air and the cornea/tear film.
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Visual outcome of penetrating keratoplasty, deep anterior lamellar keratoplasty and Descemet membrane endothelial keratoplasty.
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