Non-toric extended depth of focus contact lenses for astigmatism and presbyopia correction

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Purpose: Testing whether the extended depth of focus technology embedded on non-toric contact lenses is a suitable treatment for both astigmatism and presbyopia. Methods: The extended depth of focus pattern consisting of micron-depth concentric grooves was engraved on a surface of a mono-focal soft contact lens. These grooves create an interference pattern extending the focus from a point to a length of about 1mm providing a 3.00D extension in the depth of focus. The extension in the depth of focus provides high quality focused imaging capabilities from near through intermediate and up to far ranges. Due to the angular symmetry of the engraved pattern the extension in the depth of focus can also resolve regular as well as irregular astigmatism aberrations. Results: The contact lens was tested on a group of 8 astigmatic and 13 subjects with presbyopia. Average correction of 0.70D for astigmatism and 1.50D for presbyopia was demonstrated. Conclusions: The extended depth of focus technology in a non-toric contact lens corrects simultaneously astigmatism and presbyopia. The proposed solution is based upon interference rather than diffraction effects and thus it is characterized by high energetic efficiency to the retina plane as well as reduced chromatic aberrations.

Original languageEnglish
Title of host publicationOphthalmic Technologies XX
StatePublished - 2010
EventOphthalmic Technologies XX - San Francisco, CA, United States
Duration: 23 Jan 201025 Jan 2010

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceOphthalmic Technologies XX
Country/TerritoryUnited States
CitySan Francisco, CA


  • Astigmatism
  • Contact lenses
  • Presbyopia


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