Optical performance of 3 intraocular lens designs in the presence of decentration

Abstract

The optical performance of the model eye was not affected by decentration of an aspheric IOL designed to have no inherent spherical aberration. With decentration, the performance with the new IOL was better than with a conventional spherical IOL and an aspheric IOL designed to offset the spherical aberration of an average cornea.

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.…”

“…[20][21][22] Although they are theoretically similar to the Tecnis, different amounts of SA correction were introduced. The Tecnis has a lens SA of À0.27 mm, aiming for zero residual SA.…”

Comparison of visual outcomes, photopic contrast sensitivity, wavefront analysis, and patient satisfaction following cataract extraction and IOL implantation: aspheric vs spherical acrylic lenses

“…Table 3 summarizes the results of peer-reviewed published trial results from the literature comparing aspheric and spherical IOLs. [5][6][7][8][9][10][11] The majority of these studies evaluated the Tecnis IOL and report better optical quality with aspheric IOLs that provided better contrast sensitivity under photopic and mesopic conditions.…”

Through-focus response of multifocal intraocular lenses evaluated with a spatial light modulator

“…However in all these approaches the transition between the different defocused planes is attained by moving elements along the optical axis in the experimental setup. On the other hand the response of a MIOL to misalignments, such as tilt and decentration is a crucial issue for assessing its optical performance [6][7][8] and the tolerance to these factors is included in the battery of tests contained in the ISO 11979:2006 standard [9]. The influence of misalignments of monofocal intraocular lenses has been tested with different techniques such as using Purkinje images [10,11], Scheimpflug photography [11,12] and ray tracing [3,8,13].…”