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Related Concept Videos

Focusing of Light in the Eye01:16

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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Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Open Angle Glaucoma: Treatment

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Related Experiment Video

Updated: Jun 25, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

[Refractive surgery].

Daniel Epstein1

  • 1Augenklinik, Universitätsspital Zürich.

Therapeutische Umschau. Revue Therapeutique
|March 7, 2009
PubMed
Summary
This summary is machine-generated.

Surgical correction of refractive errors, including myopia and hyperopia, utilizes excimer laser ablation and other intraocular lens procedures. These advanced techniques offer effective vision correction for various eye conditions.

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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

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Last Updated: Jun 25, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

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

Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Context:

  • Refractive surgery has evolved significantly over the last two decades.
  • Excimer laser procedures are the most prevalent method for correcting refractive errors.

Purpose:

  • To provide an overview of current refractive surgical techniques.
  • To discuss both corneal and intraocular surgical options for vision correction.

Summary:

  • Excimer laser ablation reshapes the cornea to correct myopia (flattening) or hyperopia (steepening).
  • Alternative corneal procedures include intrastromal ring segments, thermal coagulation, and collagen cross-linking.
  • Intraocular surgeries involve implanting phakic intraocular lenses (IOLs) or replacing the natural lens with an IOL for refractive correction.

Impact:

  • Offers a comprehensive understanding of diverse refractive surgery options.
  • Highlights the advancements in vision correction technologies.
  • Empowers patients with knowledge of available surgical interventions for refractive errors.