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Proceedings Paper

Objective and subjective assessment of a new diffractive trifocal contact lens
Author(s): Valentine Fulga M.D.; Shlomo Schroeder; Gaby Avraham; Michael Belkin M.D.
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Paper 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.

Paper Details

Date Published: 26 May 1997
PDF: 3 pages
Proc. SPIE 2971, Ophthalmic Technologies VII, (26 May 1997); doi: 10.1117/12.275107
Show Author Affiliations
Valentine Fulga M.D., Holo-Or Ltd. (Israel)
Shlomo Schroeder, College of Optometry (Israel)
Gaby Avraham, College of Optometry (Israel)
Michael Belkin M.D., Goldschleger Eye Research Institute/Tel Aviv Univ. (Israel)


Published in SPIE Proceedings Vol. 2971:
Ophthalmic Technologies VII
Pascal O. Rol; Karen Margaret Joos M.D.; Fabrice Manns, Editor(s)

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