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Vision with bifocal intraocular lenses

M C Knorz1

  • 1Universitäts-Augenklinik, Klinikum Mannheim, Germany.

German Journal of Ophthalmology
|February 1, 1993
PubMed
Summary

Bifocal intraocular lenses (BIOLs) offer an expanded depth of focus but reduce contrast and increase visual side effects compared to monofocal IOLs. Groups 2 and 3 BIOLs are recommended for carefully selected patients.

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Area of Science:

  • Ophthalmology
  • Optics
  • Biomedical Engineering

Background:

  • Bifocal intraocular lenses (BIOLs) aim to provide both distance and near vision after cataract surgery.
  • Different designs of BIOLs exist, including refractive and diffractive types, each with unique optical properties.

Purpose of the Study:

  • To compare the laboratory and clinical performance of various bifocal intraocular lens (BIOL) designs.
  • To evaluate the visual outcomes, contrast sensitivity, and incidence of visual side effects associated with different BIOLs.

Main Methods:

  • Comparative analysis of laboratory and clinical data from multiple bifocal intraocular lens (BIOL) types.
  • Evaluation of image contrast, visual acuity at different distances, and patient-reported visual side effects (halos, glare).

Main Results:

  • All BIOLs significantly reduce low-contrast image quality and increase visual side effects compared to monofocal IOLs.
  • BIOLs provide a greater depth of focus (3-4 D) than monofocal IOLs (1.5 D).
  • Specific BIOL designs (groups 2 and 3) showed potential for clinical use in selected patients, with varying trade-offs in visual quality and side effects.

Conclusions:

  • Bifocal intraocular lenses (BIOLs) are not a universal replacement for monofocal IOLs but offer a valuable alternative for specific patient profiles.
  • Careful patient selection, considering factors like age, ocular health, and tolerance for visual side effects, is crucial for successful BIOL implantation.
  • Bilateral implantation of BIOLs is generally preferred, and a monofocal fellow eye is a contraindication.

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