title: Extended depth of focus contact lenses for presbyopia.
abstract: The purpose of this Letter is to design, develop, fabricate, and test in clinical trials a new (to our knowledge) type of contact lenses that provides simultaneous near and distance focused vision for presbyopic subjects, including those with up to 2.00 diopters (D) of regular/irregular astigmatism, as an alternative to multifocal contact lenses. The purpose is obtained by generating an optical pattern on the front surface of contact lenses, capable of extending the depth of focus of lenses by 3.00 D with high visual contrast. The pattern was fabricated on top of contact lenses and tested by the use of an eye simulation as well as in clinical trials. Use of the extended depth of focus contact lens enabled patients to achieve good visual acuity and contrast sensitivity for both distance and near vision without compromising the energy distribution or the visual fields.
authors.affiliation: Xceed Imaging, Petach-Tikva, Israel.
authors.forename: Alex
authors.initials: A
authors.lastname: Zlotnik
authors.forename: Shai
authors.initials: S
authors.lastname: Ben Yaish
authors.forename: Oren
authors.initials: O
authors.lastname: Yehezkel
authors.forename: Karen
authors.initials: K
authors.lastname: Lahav-Yacouel
authors.forename: Michael
authors.initials: M
authors.lastname: Belkin
authors.forename: Zeev
authors.initials: Z
authors.lastname: Zalevsky
mesh_terms: D000328:Adult; D017076:Computer-Aided Design; D003261:Contact Lenses; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D011305:Presbyopia / Q000175:diagnosis* / Q000534:rehabilitation*; D011474:Prosthesis Design; D017755:Prosthesis Fitting / Q000379:methods*; D016896:Treatment Outcome