Objective and subjective assessment of a new diffractive trifocal contact lens

Valentine Fulga, Shlomo Schroeder, Gaby Avraham, Michael Belkin

Research output: Contribution to journalConference articlepeer-review

Abstract

We tested the objective and subjective performance of the Holo-Or rigid gas permeable multifocal contact lens, a new trifocal diffractive contact lens. Eleven experienced and two non-experienced rigid gas permeable contact lens wearers participated in the study. Eleven patients were presbyopic (age 40 - 57) and two aphakic (age 12 and 14). All patients were tested both with their best spectacle correction for distance and near and the trifocal diffractive contact lenses. The follow up period was 3 - 8 months. Subjective opinion was also assessed. Statistical analysis was performed using Student's T-test. We did not find any significant difference in visual acuity measured at 6 m, 80 cm and 40 cm, between best spectacle correction and Holo-Or diffractive contact lenses. Depth of focus improved to a statistically significant extent when using trifocal contact lenses. A small reduction in contrast sensitivity was observed when the patients used the multifocal contact lenses. Overall satisfaction and comfort was good to excellent in ten of the thirteen patients. Two other patients who used a bifocal model of the same contact lens design showed similar results. Holo-Or trifocal diffractive contact lenses are a satisfactory means of optical correction for patients with presbyopia or accommodative problems.

Original languageEnglish
Pages (from-to)134-136
Number of pages3
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2971
DOIs
StatePublished - 1997
EventOphthalmic Technologies VII - San Jose, CA, United States
Duration: 8 Feb 19978 Feb 1997

Keywords

  • Aphakia contrst sensitivity
  • Depth of focus
  • Diffractive
  • Presbyopia
  • Rigid gas permeable
  • Simultaneous vision
  • Trifocal contact lens

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