Офтальмохирургия (Jan 2014)
Experimental study of aberration characteristics changing in case of intraocular lenses decentration
Abstract
Nowadays the creation of high functional vision in intraocular correction which depends much on the optical properties of implanted IOL is of great importance. So far as even after an impeccably performed operation an IOL decentration occurs that inevitably induces aberrations which reduce the vision of a pseudophakic eye, it is important to use IOL models that are least sensitive to decentration. Purpose. To identify IOL models that are less sensitive to decentration using an artificial model of eye optical system. Material and methods. The experimental study of aberration properties of different IOL models TECNIS®, SA60AT, SN60WF, SL-907 «CentriX DZ» has been conducted on an original model. Results. At first the aberrometry of the eye model was performed without IOL, later an investigated IOL was placed into the eye model and centered by localization of mirror images of LEDs centering. Artificially created IOL decentration along the X-axis had ±0.5mm and ±1.0mm values, IOL angular rotations around the vertical axis were ±4° and ±8°. Decentration of all IOL models as well as its rotation around the vertical axis caused the change in the aberrations amplitude. The study showed that the SL-907 «CentriX DZ» IOL model is less sensitive to any IOL decentration and rotation (tilt), the TECNIS® and SN60WF models are more sensitive. The SA60AT IOL is the most sensitive to the decentr ation and rotation. Conclusions. Thus, the IOL decentration in the range of ±1mm and rotation angles of ±8 degrees cause an increase in the amplitude of the aberration modes, equal values of IOL decentration entail unequal changes in the values of aberrations between different IOL models. It has been found that the SL-907 «CentriX DZ» IOL model is less sensitive to decentration, rotation and tilt, that allows its use in cases with a high risk of its displacement in the postoperative period.
