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Related Concept Videos

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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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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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Related Experiment Video

Updated: Jun 2, 2026

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
11:49

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

Published on: March 8, 2019

[Refractive stability of artificial crystallins--acrysof TORIC].

C Stefan1, M Zemba, O Muşat

  • 1Spitalul Universitar de Urgenţă Militar Central, Bucureşti.

Oftalmologia (Bucharest, Romania : 1990)
|April 27, 2011
PubMed
Summary

The AcrySof Toric intraocular lens (IOL) effectively corrects pre-existing astigmatism and demonstrates good rotational stability following cataract surgery. This toric IOL is a viable option for carefully selected patients needing astigmatism correction.

More Related Videos

Rotating the Intraocular Lens to Prevent Posterior Capsular Opacification in Cataract Surgeries
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Rotating the Intraocular Lens to Prevent Posterior Capsular Opacification in Cataract Surgeries

Published on: July 7, 2023

Related Experiment Videos

Last Updated: Jun 2, 2026

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
11:49

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

Published on: March 8, 2019

Rotating the Intraocular Lens to Prevent Posterior Capsular Opacification in Cataract Surgeries
04:59

Rotating the Intraocular Lens to Prevent Posterior Capsular Opacification in Cataract Surgeries

Published on: July 7, 2023

Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Context:

  • Cataract surgery is a common procedure.
  • Pre-existing astigmatism can complicate visual outcomes.
  • Toric intraocular lenses (IOLs) are designed to correct astigmatism.

Purpose:

  • To evaluate the efficacy of AcrySof Toric IOL implantation.
  • To assess the rotational stability of the AcrySof Toric IOL.
  • To determine the impact on pre-existing astigmatism correction.

Summary:

  • A retrospective study of 37 eyes with pre-existing astigmatism (>1D) evaluated AcrySof Toric IOL outcomes.
  • Postoperative rotation was minimal, with 87% of eyes showing 0-5 degrees of rotation at 6 months.
  • Significant reduction in mean refractive cylinder was observed, with 91.9% of cases achieving 0.25-0.75D correction.

Impact:

  • The AcrySof Toric IOL is a viable option for correcting preoperative corneal astigmatism.
  • Good rotational stability was demonstrated, crucial for effective astigmatism correction.
  • Understanding causes of rotation (viscoelastic, capsular fibrosis) can optimize outcomes.