Spherical aberration and coma with an aspherical and a spherical intraocular lens in normal age-matched eyes

Abstract

After uneventful implantation, the aspherical IOL yielded better ocular aberration and optical quality results than the spherical IOL. Induced coma was somewhat higher in the Tecnis group; however, the overall results were not affected. Physiologic IOL decentration after correct in-the-bag implantation did not negate the advantages of asphericity.

Comparison of higher order aberrations in eyes with aspherical or spherical intraocular lenses

“…The greater variability of the present result may be because the i-Trace adapted ray-tracing technology is very flexible and robust for examining extreme aberrations, whereas Shack-Hartmann-based systems tend to have a limited dynamic range in measuring higher order aberrations. 13 There is accumulating evidence supporting the functional vision benefit of aspheric over spherical IOLs, [6][7][8][9][10][20][21][22] and this study is consistent with such reports. On the contrary, some recent clinical trials reported no significant gains with the aspheric IOL in terms of BCVA, [10][11][12][13][20][21][22] or other subjective questionnaires, such as visual function-14(VF-14) score, 13 or the activities of daily vision scale.…”

“…[6][7][8][9][10] This is the first report in the peer-reviewed arena on the clinical performance of the hydrophobic acrylate version of the Tecnis IOL. The study compared the Tecnis IOL with the SA60AT lens, which is one of the most favoured hydrophobic acrylic lenses.…”

“…A number of reports verify reduced spherical aberrations associated with this IOL, and indicate that it provides superior contrast sensitivity compared to various spherical IOLs. [6][7][8][9][10] However, there were some recent trials showing no significant advantages in terms of subjective visual function. [11][12][13] This study compared the optical quality of the acrylate version of the aspheric Tecnis IOL (ZA9003, AMO Inc., Santa Ana, CA, USA) with the most widely used conventional acrylate IOL (AcrySof SA60AT, Fort Worth, TX).…”

“…Secondary astigmatism and quadrafoil were not considered as previous reports showed that they had little effect on visual acuity. 9 …”

Interplay of aberrations and visual parameters in pseudophakic eyes

“…24 This suggest that aspheric IOLs reduces the vertical coma significantly. Bellucci et al, 25 also found reduced ocular vertical coma with the Tecnis. In the Roman alphabet, vertical elements predominate, and the recognition of these are important for reading ability.…”