Extended depth of focus technologies expand presbyopia correction options

According to the manufacturer of the Symfony, the diffractive process incurred by the IOL steps results in multiple foci, which encompass useful distances from far to intermediate vision. In vitro studies have shown us that this type of optic can be quite accurately described by a wavelength-depende...

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Bibliographic Details
Published inOcular surgery news Vol. 36; no. 2; pp. 1 - 15
Main Authors Cimberle, Michela, Dell, Steven J, Trattler, William B
Format Journal Article
LanguageEnglish
Published Thorofare SLACK INCORPORATED 25.01.2018
Subjects
Cataracts
Eye surgery
Optics
Patients
Reading
Miyajima
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Summary:According to the manufacturer of the Symfony, the diffractive process incurred by the IOL steps results in multiple foci, which encompass useful distances from far to intermediate vision. In vitro studies have shown us that this type of optic can be quite accurately described by a wavelength-dependent bifocal diffractive split between distance and intermediate vision," Gatinel said. Because diffraction is wavelengthdependent, the foci for green, red and blue light are located at slightly different distances, and this creates what manufacturers define as an "elongated focus zone. According to Gatinel, the best indication for EDOF lenses corresponds to a patient whose refractive ambition is to avoid spectacles for distance and intermediate vision, minimizing the risk for night visual disturbances. "If you have a big angle kappa, the primary ray of light will not be coming through the center of the pupil but toward the edge. Since IOLs are centered within the capsular bag, that primary ray of light may not go through the central zone of the IOL but transverse the first ring of the multifocal lens, creating a lot of ghosting and aberrations," Pepose said.
ISSN:8750-3085