Optical aberrations of the human anterior cornea

Abstract

Anterior corneal wavefront aberrations varied greatly among subjects and increased slightly with aging. All corneas had positive 4th-order SAs, and the values did not change with aging. A moderate to high degree of mirror symmetry existed between right and left eyes.

Custom optimization of intraocular lens asphericity

“…Large ranges of corneal SA in the population have been reported. 5 Therefore, depending on an individual's corneal SA and the SA of the IOL selected, a wide range of residual ocular SA is possible for an eye undergoing IOL implantation.…”

“…5 Applegate and colleagues 6 have reported that aberrations in different Zernike terms interact to increase or decrease optical performance. It is unclear what the optimal amount of SA would be in eyes with various HOAs.…”

Treatment of Highly Aberrated Eyes Using the NIDEK CXIII Excimer Laser

“…Holladay et al 1 reported a mean corneal spherical aberration value of 0.27 µm, which generally agrees with the literature for Caucasian populations. 9,10 These data, on the whole, imply a variability in optical aberrations between ethnic groups, as Japanese eyes seem to have smaller corneal spherical aberration than Caucasian eyes.…”

“…8 The use of ocular wavefront-guided treatment may have some limitations as some aberrometers cannot accurately measure eyes with central islands or with severe changes in refractive power across the pupil. 5,9,10 Additionally, the incorporation of lenticular aberrations that are clinically insignifi cant in the optical degradation of an eye that has undergone corneal surgery or trauma results in needless tissue removal.…”

“…5,9,10 Additionally, the incorporation of lenticular aberrations that are clinically insignifi cant in the optical degradation of an eye that has undergone corneal surgery or trauma results in needless tissue removal.…”