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Related Concept Videos

Angle Closure Glaucoma: Treatment01:28

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...
Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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Related Experiment Video

Updated: Jun 3, 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

Postoperative astigmatism in the second eye undergoing cataract surgery.

Christopher T Leffler1, Martin Wilkes, Juliana Reeves

  • 1Ophthalmology Section, Hunter Holmes McGuire Veterans Affairs Medical Center, and Department of Ophthalmology, Virginia Commonwealth University School of Medicine, Richmond, Virginia 23249, USA.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|March 16, 2011
PubMed
Summary

Postoperative astigmatism in the first eye strongly predicts outcomes in the second eye after cataract surgery. This finding, consistent with corneal symmetry, aids in predicting and controlling astigmatism in subsequent procedures.

Related Experiment Videos

Last Updated: Jun 3, 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

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Biometry

Background:

  • Cataract surgery aims to restore vision, but postoperative astigmatism can impact visual outcomes.
  • Accurate prediction of astigmatism in the second eye is crucial for optimizing surgical planning and patient satisfaction.
  • Standard biometry and data from the first eye offer potential predictors for the second eye's refractive astigmatism.

Purpose of the Study:

  • To predict postoperative refractive astigmatism in the second eye undergoing cataract surgery.
  • To utilize standard biometry and information from the first eye for predictive modeling.
  • To assess the correlation between the first and second eyes' astigmatism for improved surgical control.

Main Methods:

  • Retrospective study of 160 patients undergoing bilateral sequential cataract surgery.
  • Astigmatism components (with-the-rule J(0) and oblique J(X)) analyzed using Jackson cross cylinder.
  • Multivariable regression employed to identify preoperative predictors of postoperative refractive astigmatism in the second eye.

Main Results:

  • Postoperative refractive astigmatism in the first eye explained 40% of the variation in the second eye (r² = 0.40).
  • A multivariable model predicted with-the-rule astigmatism in the second eye using first eye's astigmatism, second eye's keratometric astigmatism, and second eye's preoperative astigmatism (r² = 0.56).
  • A separate model predicted oblique astigmatism in the second eye using keratometric astigmatism from both eyes and second eye's preoperative astigmatism (r² = 0.20).

Conclusions:

  • Postoperative with-the-rule astigmatism in the first eye is a significant predictor of that in the second eye.
  • Keratometric oblique astigmatism in the first eye weakly but significantly predicts postoperative oblique astigmatism in the second eye.
  • Findings support corneal mirror symmetry and can enhance the prediction and control of postoperative astigmatism in bilateral cataract surgery.