Extended depth of focus contact lenses for presbyopia

Alex Zlotnik, Shai Ben Yaish, Oren Yehezkel, Karen Lahav-Yacouel, Michael Belkin, Zeev Zalevsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


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.

Original languageEnglish
Pages (from-to)2219-2221
Number of pages3
JournalOptics Letters
Issue number14
StatePublished - 15 Jul 2009


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