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Angle Closure Glaucoma: Treatment01:28

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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: May 24, 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

[Astigmatism correction with Excimer laser].

L Gauthier1

  • 1Espace Hélios, Layatz II, 8, rue de la Ferme-Dai-Baita, 64500 Saint-Jean-de-Luz, France. Lgauthier@ophtaluz.com

Journal Francais D'Ophtalmologie
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

Excimer laser treatments, particularly LASIK, are effective for astigmatism correction. Advanced techniques like flying spot lasers and wavefront-guided ablations offer precise correction for complex astigmatism cases.

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Last Updated: May 24, 2026

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

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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

Area of Science:

  • Ophthalmology
  • Laser Surgery

Background:

  • Astigmatism correction is a common ophthalmic procedure.
  • Excimer laser technology is the primary method for refractive correction.

Purpose of the Study:

  • To review and compare different excimer laser techniques for astigmatism correction.
  • To highlight optimal strategies for various astigmatism types.

Main Methods:

  • Discussion of excimer laser modalities including LASIK, PRK, flying spot lasers, and topography-guided/wavefront-guided photoablations.
  • Analysis of treatment considerations for myopic, hyperopic, and mixed astigmatism.

Main Results:

  • LASIK is generally preferred over PRK, especially for hyperopic and mixed astigmatism.
  • Myopic astigmatism is simpler to treat by ablating the flat meridian.
  • Hyperopic and mixed astigmatism correction requires larger optical zones and advanced techniques.
  • Precise ablation placement on the astigmatism axis is crucial.
  • Eye trackers and preoperative markings mitigate cyclotorsion and head positioning errors.
  • Topography-guided or wavefront-guided photoablations are best for irregular astigmatism.

Conclusions:

  • Excimer laser surgery offers effective astigmatism correction.
  • Technique selection depends on astigmatism type, with advanced methods for complex cases.
  • Precision in ablation placement and patient alignment is key for successful outcomes.