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Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Related Experiment Video

Updated: May 11, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Corneal inlays for presbyopia correction.

Richard L Lindstrom1, Scott M Macrae, Jay S Pepose

  • 1Minnesota Eye Consultants, Bloomington, MN 55431, USA. rllindstrom@mneye.com

Current Opinion in Ophthalmology
|May 25, 2013
PubMed
Summary

Corneal inlays offer a promising solution for presbyopia, improving near and intermediate vision with minimal complications. This technology provides spectacle independence for many patients seeking clear vision at all distances.

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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Vision Science

Background:

  • Presbyopia affects a large and growing demographic.
  • Patients are increasingly seeking spectacle independence.
  • Existing solutions like monovision have visual compromises.

Purpose of the Study:

  • To review the three types of corneal inlays for presbyopia correction.
  • To evaluate the safety and efficacy of corneal inlays based on recent evidence.

Main Methods:

  • Review of published literature on corneal inlays.
  • Analysis of safety and efficacy data for different inlay types.

Main Results:

  • Small-aperture inlays are widely used and effective for near/intermediate vision.
  • These inlays show minimal impact on distance acuity and visual symptoms.
  • Complications are minimal, and inlays are removable if needed.

Conclusions:

  • Corneal inlays represent a bright future for presbyopia correction.
  • They offer a viable alternative to intraocular surgery or monovision.
  • Further research is needed, but inlay technology shows significant potential.