Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

6.6K
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...
6.6K
Glaucoma: Overview01:25

Glaucoma: Overview

1.5K
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...
1.5K
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

1.4K
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...
1.4K
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

1.0K
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...
1.0K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Suprachoroidal hemorrhage associated with cataract surgery: A case series analysis.

The Journal of international medical research·2025
Same author

Subnuclear Phacoemulsification to Reduce Corneal Injury in Nuclear Cataract Surgery: Evidence From a Randomized Controlled Trial.

Journal of ophthalmology·2025
Same author

Association Between Non-Suicidal Self-Injury and Gut Microbial Characteristics in Chinese Adolescent.

Neuropsychiatric disease and treatment·2022
Same author

Effectiveness of intraoperative intraocular lens use on improving surgical safety for dense cataract phacoemulsification: a randomized controlled trial.

Scientific reports·2020

Related Experiment Video

Updated: Feb 26, 2026

Author Spotlight: Enhancing Visual Outcomes in Cataract Surgery: A Novel Technique to Prevent Posterior Capsular Opacification Through IOL Rotation
04:59

Author Spotlight: Enhancing Visual Outcomes in Cataract Surgery: A Novel Technique to Prevent Posterior Capsular Opacification Through IOL Rotation

Published on: July 7, 2023

3.1K

Intraocular Lens Power Calculation for Combined Cataract and Pterygium Surgeries.

Zebin Li1,2, Beiling Tan1,2, Yanting Chen2

  • 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, Guangdong, People's Republic of China.

Clinical Ophthalmology (Auckland, N.Z.)
|February 25, 2026
PubMed
Summary

A new topography-guided method improves intraocular lens power calculation accuracy for combined cataract and pterygium surgery. This method reduces refractive errors and enhances visual outcomes by addressing corneal distortions caused by pterygium.

Keywords:
cataractcorneal powerintraocular lens power calculationpterygiumsurgery

More Related Videos

Ultrasound Cyclo Plasty in Eyes with Glaucoma
05:05

Ultrasound Cyclo Plasty in Eyes with Glaucoma

Published on: January 26, 2018

12.7K
Iris Fixation via External Pentagram Suturing
05:22

Iris Fixation via External Pentagram Suturing

Published on: May 5, 2022

1.9K

Related Experiment Videos

Last Updated: Feb 26, 2026

Author Spotlight: Enhancing Visual Outcomes in Cataract Surgery: A Novel Technique to Prevent Posterior Capsular Opacification Through IOL Rotation
04:59

Author Spotlight: Enhancing Visual Outcomes in Cataract Surgery: A Novel Technique to Prevent Posterior Capsular Opacification Through IOL Rotation

Published on: July 7, 2023

3.1K
Ultrasound Cyclo Plasty in Eyes with Glaucoma
05:05

Ultrasound Cyclo Plasty in Eyes with Glaucoma

Published on: January 26, 2018

12.7K
Iris Fixation via External Pentagram Suturing
05:22

Iris Fixation via External Pentagram Suturing

Published on: May 5, 2022

1.9K

Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Refractive Surgery

Background:

  • Combined cataract and pterygium surgery offers efficiency but challenges intraocular lens (IOL) power calculation.
  • Pterygium-induced corneal surface and tear film irregularities lead to inaccurate keratometry readings.
  • This inaccuracy often results in unpredictable postoperative refractive outcomes, including myopic shift.

Purpose of the Study:

  • To develop and validate a novel topography-guided selective keratometry method.
  • To enhance the accuracy of IOL power calculation in eyes with coexisting cataract and pterygium.
  • To improve refractive outcomes following combined surgical procedures.

Main Methods:

  • A comparative study randomly assigned patients into control (standard keratometry) and study (topography-guided keratometry) groups.
  • The novel method used simulated keratometry (SimK) from specific corneal zones and contralateral quadrant data for IOL power calculation.
  • Both groups underwent combined phacoemulsification and pterygium excision, with outcomes compared using Mean Absolute Error (MAE).

Main Results:

  • Postoperative corneal power changes were localized to the pterygium side.
  • The topography-guided method group showed significantly better uncorrected distance visual acuity (UDVA) and refractive outcomes closer to the target.
  • Mean Absolute Error (MAE) was significantly lower in the study group (0.22 D) compared to the control group (1.18 D).

Conclusions:

  • The developed topography-guided selective keratometry method significantly improves IOL power calculation accuracy.
  • This method effectively addresses corneal distortions caused by pterygium.
  • Enhanced predictive accuracy leads to superior refractive and visual outcomes in combined cataract and pterygium surgery.