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

7.2K
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...
7.2K
Glaucoma: Overview01:25

Glaucoma: Overview

1.6K
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...
1.6K

You might also read

Related Articles

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

Sort by
Same author

Effect of intraocular pressure reduction on progressive high myopia (PHM study): study protocol of a randomised controlled trial.

BMJ open·2024
Same author

Efficacy and Safety of Surgical Peripheral Iridectomy, Goniosynechialysis, and Goniotomy for Advanced Primary Angle Closure Glaucoma Without Cataract: 1-Year Results of a Multicenter Study.

Journal of glaucoma·2024
Same author

Impact of Peripheral Anterior Synechiae on the Outcome of Combined Phacoemulsification, Goniosynechialysis, and Goniotomy for Primary Angle Closure Glaucoma and Cataract: A Multicenter Observational Study.

Journal of glaucoma·2024
Same author

Genetic association of TIE2 with diabetic retinopathy and diabetic macular edema.

Asia-Pacific journal of ophthalmology (Philadelphia, Pa.)·2024
Same author

Phacogoniotomy versus phacotrabeculectomy for advanced primary angle-closure glaucoma with cataract: A randomized non-inferiority trial.

Asia-Pacific journal of ophthalmology (Philadelphia, Pa.)·2024
Same author

Phacogoniotomy: An alternative treatment for advanced primary angle-closure glaucoma with cataract.

Asia-Pacific journal of ophthalmology (Philadelphia, Pa.)·2024

Related Experiment Video

Updated: Mar 22, 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

733

Accuracy of Intraocular Lens Power Calculation Formulas for Highly Myopic Eyes.

Yichi Zhang1, Xiao Ying Liang2, Shu Liu3

  • 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510080, China.

Journal of Ophthalmology
|April 28, 2016
PubMed
Summary

The Barrett Universal II formula offers the most accurate and consistent refractive predictions for long eyes (axial length > 26mm). This intraocular lens calculation method is recommended for high myopia patients.

More Related Videos

Scanning Light Scattering Profiler SLPS Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
06:55

Scanning Light Scattering Profiler SLPS Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses

Published on: June 6, 2017

8.0K
Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

3.4K

Related Experiment Videos

Last Updated: Mar 22, 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

733
Scanning Light Scattering Profiler SLPS Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
06:55

Scanning Light Scattering Profiler SLPS Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses

Published on: June 6, 2017

8.0K
Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

3.4K

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optics

Background:

  • Accurate intraocular lens (IOL) power calculation is crucial for achieving desired refractive outcomes after cataract surgery.
  • Eyes with long axial lengths (AL) present unique challenges for standard IOL calculation formulas.
  • High myopia, characterized by long AL, requires precise IOL power selection to minimize refractive surprises.

Purpose of the Study:

  • To compare the accuracy of five common IOL power calculation formulas in eyes with AL > 26.00 mm.
  • To identify the most reliable formula for predicting refractive outcomes in long eyes.
  • To evaluate formula performance based on refractive prediction errors and variability.

Main Methods:

  • Retrospective review of 407 eyes with AL > 26.00 mm.
  • Evaluation of refractive prediction errors for SRK/T, Haigis, Holladay, Hoffer Q, and Barrett Universal II formulas.
  • Utilized User Group for Laser Interference Biometry (ULIB) constants for calculations.

Main Results:

  • Barrett Universal II formula demonstrated the lowest Mean Absolute Error (MAE).
  • SRK/T and Haigis formulas showed similar MAE, while Holladay and Hoffer Q had the highest MAE.
  • Barrett Universal II yielded the highest percentage of eyes within ±0.5 D (79.56%) and ±1.0 D (97.24%) of target refraction.

Conclusions:

  • The Barrett Universal II formula is superior in accuracy and consistency for IOL power calculation in long eyes.
  • It provides the least predictive error and variability compared to other tested formulas.
  • Barrett Universal II is recommended as a more suitable choice for high myopic eyes.