Journal of cataract and refractive surgery · 2018
Effect of intraocular lens decentration on image quality tested in a custom model eye.
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Pérez-Merino Pablo, Marcos Susana
Аннотация
PURPOSE: To evaluate the effect of intraocular lens (IOL) decentration on optical aberrations with different IOL designs.
SETTING: Visual Optics and Biophotonics Laboratory, Instituto de Óptica, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
DESIGN: Experimental study.
METHODS: The following 18 aspheric IOLs immersed in a physical model eye were measured using a laser ray-tracing aberrometer: 10 Vivinex XY1 with spherical aberration correction of -0.18 μm (V-0.18), 4 Tecnis 1P ZCB00V with spherical aberration correction of -0.27 μm (T-0.27), and 4 Acrysof 1P SN60WF with spherical aberration correction of -0.17 μm (A-0.17). The optical aberrations were evaluated with the IOL on axis and 0.4 mm and 0.7 mm laterally decentered. The laser ray tracing-measured aberrations were compared with aberrations estimated using virtual ray tracing. Retinal image quality was evaluated from the modulation transfer function (MTF) and visual Strehl ratio.
RESULTS: Wave aberration measurements of the same IOL were highly repetitive (deviation <0.02 μm). Astigmatism and coma increased with decentration at a rate of 0.18 μm/mm and 0.19 μm/mm for the V-0.18, 0.20 μm/mm and 0.32 μm/mm for the T-0.27, and 0.26 μm/mm and 0.39 μm/mm for the A-0.17, respectively. The 0.7 mm lateral decentration decreased the visual Strehl ratio by 2.23 times for the V-0.18, by 2.8 times for the T-0.27, and by 3.2 times for the A-0.17. The V-0.18 showed the highest MTF and visual Strehl values for all centration values.
CONCLUSIONS: Lateral decentration resulted in decreased retinal image quality. The V-0.18 was the most immune design to optical degradation caused by decentration.
SETTING: Visual Optics and Biophotonics Laboratory, Instituto de Óptica, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
DESIGN: Experimental study.
METHODS: The following 18 aspheric IOLs immersed in a physical model eye were measured using a laser ray-tracing aberrometer: 10 Vivinex XY1 with spherical aberration correction of -0.18 μm (V-0.18), 4 Tecnis 1P ZCB00V with spherical aberration correction of -0.27 μm (T-0.27), and 4 Acrysof 1P SN60WF with spherical aberration correction of -0.17 μm (A-0.17). The optical aberrations were evaluated with the IOL on axis and 0.4 mm and 0.7 mm laterally decentered. The laser ray tracing-measured aberrations were compared with aberrations estimated using virtual ray tracing. Retinal image quality was evaluated from the modulation transfer function (MTF) and visual Strehl ratio.
RESULTS: Wave aberration measurements of the same IOL were highly repetitive (deviation <0.02 μm). Astigmatism and coma increased with decentration at a rate of 0.18 μm/mm and 0.19 μm/mm for the V-0.18, 0.20 μm/mm and 0.32 μm/mm for the T-0.27, and 0.26 μm/mm and 0.39 μm/mm for the A-0.17, respectively. The 0.7 mm lateral decentration decreased the visual Strehl ratio by 2.23 times for the V-0.18, by 2.8 times for the T-0.27, and by 3.2 times for the A-0.17. The V-0.18 showed the highest MTF and visual Strehl values for all centration values.
CONCLUSIONS: Lateral decentration resulted in decreased retinal image quality. The V-0.18 was the most immune design to optical degradation caused by decentration.