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Optimal orientation for angularly segmented multifocal corrections.

Pablo de Gracia1,2, Andreas Hartwig3

  • 1Midwestern University, Chicago College of Optometry, Downers Grove, IL, USA.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|August 25, 2017
PubMed
Summary
This summary is machine-generated.

The orientation of multifocal lenses significantly impacts visual performance. Bifocal designs performed best monocularly, while combining monofocal and trifocal lenses yielded optimal binocular vision, considering eye aberrations.

Keywords:
angular segmentationcontact lenseshigher order aberrationsintraocular lensesmultifocal correctionsmultifocalityoptical qualitypresbyopiavisual Strehl ratio

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Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Visual Optics

Background:

  • Multifocal intraocular lenses (IOLs) are used to correct presbyopia.
  • The optical performance of multifocal IOLs can be influenced by lens design and patient-specific higher-order aberrations (HOAs).
  • Understanding the impact of lens orientation is crucial for optimizing visual outcomes.

Purpose of the Study:

  • To evaluate the importance of lens orientation in multifocal IOL designs with angular increments.
  • To analyze how different multifocal designs perform in combination with patient HOAs.

Main Methods:

  • Simulated optical performance of monofocal and multifocal IOLs (bifocal, trifocal, 4-foci) using the visual Strehl ratio (VSOTF) through-focus metric.
  • Tested designs with HOAs from 782 subjects (1564 eyes).
  • Assessed monocular and binocular performance, including optical disparity for binocular combinations.

Main Results:

  • Bifocal designs showed superior monocular performance, with vertically divided designs being optimal for 48% of eyes.
  • Trifocal and 4-foci designs provided longer intervals of acceptable through-focus vision.
  • Optimal lens orientation correlated with specific HOAs (coma, spherical aberration); the best binocular combination involved a monofocal and a trifocal lens.

Conclusions:

  • Lens orientation critically affects the optical properties of multifocal IOLs when combined with the eye's HOAs.
  • Considering patient-specific aberrations, particularly coma and spherical aberration, can enhance the optical quality of angularly segmented multifocal solutions.
  • Specific orientations, like segmented bifocal designs, can improve visual performance in certain patient populations.