MULTIFOCAL CORRECTION PROVIDING IMPROVED QUALITY OF VISION

摘要

PROBLEM TO BE SOLVED: To improve visual experience while expanding the depth of field of presbyopic and pseudophakic patients.SOLUTION: The invention describes strategies and devices for reducing the visibility of a defocused part of a retinal image generated by a simultaneous vision bifocal ophthalmic correction, a simultaneous vision multifocal ophthalmic correction and monovision. The invention describes strategies and devices that employ control of spherical aberration or other similar asphericity to reduce the visibility of defocused ghost images. The invention describes strategies and devices that ensure that negative defocus is always coupled with negative spherical aberration (or similar asphericity), and that positive defocus is always coupled with positive SA (or similar asphericity) as means to reduce the visibility of defocused ghost images.SELECTED DRAWING: Figure 3