Near distance vision with aspherical intraocular lenses in a model eye

• Published in: Acta ophthalmologica (Oxford, England) England), 2011-09, Vol.89 (s248), p.0-0
• Main Authors: LANGENBUCHER, A, JANUNTS, E, GILLNER, M, EPPIG, T
• Format: Article
• Language: English
• Subjects: Intraocular lenses; Vergence eye movements; Vision
• ISSN: 1755-375X; 1755-3768
• DOI: 10.1111/j.1755-3768.2011.257.x

Purpose To determine the image performance of aberration free (AF) and aberration correcting (AC) aspherical IOLs for objects located at near distance in a model eye. Methods For our simulation we considered 2 AF IOLs (1: Bausch&Lomb SOFPORT, 2: Dr. Schmidt MC6125 AS), 2 AC IOLs 3: Alcon Z9000, 4: Zeiss Invent ZO) and for reference a spherical IOL (5: Dr. Schmidt MC5812). All lenses (nominal refractive power: 22 D) were optimized for objects at far distance at a pupil of 3.0mm and all simulations were done for a pupil of 4.5mm. Image performance was assessed with Strehl ratio and geometrical RMS spot size using optical design software OSLO. The object vergence was increased from 0D:0.5D:3.5D to simulate the capabilities for near distance vision. The Liou Brennan (LBME) and the Gullstrand (GME) model eye were used for simulation. Results With the LBME for far distant objects the Strehl ratio/RMS spot size was 0.1768/0.0157, 0.2613/0.0131, 0.8978/0.0008, 0.3577/0.0066 and 0.0159/0.0261 for lenses 1 to 5, respectively. For near distant objects (vergence 3D) it was 0.0018/0.0730, 0.0011/0.0579, 0.0004/0.0855, 0.0007/0.0801 and 0.0029/0.0669. With the GME for far distant objects (vergence 0D) the Strehl ratio/RMS spot size was 0.1698/0.0159, 0.2442/0.0134, 0.8651/0.0008, 0.3257/0.0069 and 0.0117/0.0246 for lenses 1 to 5, respectively. For near distant objects (vergence 3D) it was 0.0018/0.0718, 0.0013/0.0747, 0.0003/0.0861, 0.0007/0.0789 and 0.0066/0.0656. Conclusion As both AC IOLs show the best imaging performance mostly for the LBME as well as the GME for far distance objects, the performance is strongly degraded for near distant objects and even worse than the respective values for AF and spherical IOLs both, for the LBME as well as the GME.