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Related Experiment Video

Updated: Feb 28, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
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Optical design considerations for contact lens bifocals.

P Erickson1, M Robboy, A Apollonio

  • 1Bausch & Lomb, Inc., Rochester, NY 14692.

Journal of the American Optometric Association
|March 1, 1988
PubMed
Summary

Designing effective bifocal contact lenses requires careful optical zone placement for clear distance and near vision. Lens performance is sensitive to pupil size and position, necessitating optimization strategies.

Area of Science:

  • Ophthalmic optics
  • Contact lens design

Background:

  • Conventional bifocal contact lenses present design challenges.
  • Ensuring adequate optical power for both distance and near vision is crucial.
  • Minimizing optical aberrations like secondary images is a primary concern.

Purpose of the Study:

  • To establish guidelines for predicting bifocal contact lens performance.
  • To analyze optical zone configurations and their impact on vision.
  • To discuss strategies for optimizing bifocal contact lens design.

Main Methods:

  • Utilizing geometrical models and lens measurements.
  • Evaluating proportional optical zone representation.
  • Analyzing image jump and power distribution in common lens designs.

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Main Results:

  • Optical zone representation and effective lens power are highly dependent on pupil size and position.
  • Common bifocal zone configurations were analyzed for their performance.
  • Sensitivity of lens power to pupil variations was quantified.

Conclusions:

  • Bifocal contact lens design must account for dynamic changes in pupil size and position.
  • Optimization strategies are necessary to maintain visual performance.
  • Further research can refine bifocal contact lens optics for improved patient outcomes.