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Optimal orientation for angularly segmented multifocal corrections.
- Source :
-
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) [Ophthalmic Physiol Opt] 2017 Sep; Vol. 37 (5), pp. 610-623. - Publication Year :
- 2017
-
Abstract
- Purpose: Evaluate the importance of orientation of multifocal lens designs with angular increments of addition.<br />Methods: Optical properties of one monofocal and three multifocal designs were analysed with the visual Strehl ratio (VSOTF) metric through-focus (-1 to 5 D). Designs were tested in combination with the higher-order aberrations (HOAs) of 782 subjects (1564 eyes). Simulations included one monofocal, one bifocal (eight orientations), one trifocal (four orientations), and a 4-foci design (four orientations). Monocular and binocular performances of all designs were assessed by computing the area under the through-focus VSOTF plots, the through-focus range of acceptable optical performance, and, for binocular combinations, optical disparity between left and right eyes.<br />Results: Under monocular conditions, bifocal designs generated larger areas under the through focus VSOTF than trifocal designs and 4-foci designs. Specifically, bifocal designs divided vertically were optimal for 48% of eyes. Trifocal designs and 4-foci designs offered longer intervals of acceptable through-focus vision. Coma and spherical aberration values were correlated with the optimal orientation of multifocal corrections. The best binocular combination was achieved with a monofocal and a trifocal lens. The orientation of a multifocal design with angular areas affected the final optical properties of the combination (lens plus eye).<br />Conclusions: The optical aberration distributions for our population of physiologically normal eyes demonstrated improved performance for some lens design orientations (i.e., left-right segments for 2-zone bifocals). Taking into account the HOAs of healthy patients, with special attention to coma and spherical aberration, will increase the optical quality of angularly divided multifocal solutions.<br /> (© 2017 The Authors Ophthalmic & Physiological Optics © 2017 The College of Optometrists.)
Details
- Language :
- English
- ISSN :
- 1475-1313
- Volume :
- 37
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)
- Publication Type :
- Academic Journal
- Accession number :
- 28836389
- Full Text :
- https://doi.org/10.1111/opo.12402