Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Focusing of Light in the Eye

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...

You might also read

Related Articles

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

Sort by

Same author

Evaluating the impact of the water content of hydrophobic intraocular lenses on visual quality.

Biomedical engineering letters·2026

Same author

Protective Effects of Standardized Peucedanum Japonicum Thunb. Extract Against UVB-Induced Corneal Epithelial Apoptosis via Mitochondrial Regulation.

Frontiers in bioscience (Landmark edition)·2025

Same author

The influence of diabetic retinopathy on the risk of dementia: A nationwide cohort study.

Scientific reports·2025

Same author

Melatonin Ameliorates Desiccation Stress-Induced Ocular Inflammation in an In Vitro Model by Activating the Nrf2 Pathway.

Journal of cellular and molecular medicine·2025

Same author

Periostin Deletion Reduces Corneal Opacity and the Infiltration of Immune Cells.

The American journal of pathology·2025

Same author

Comparison of ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers.

PloS one·2024

Search research articles

Related Experiment Video

Updated: Jun 6, 2025

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

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

Published on: June 6, 2017

Predictive Accuracy of Intraocular Lens Formulas Calculated by Biometers with Multiple Refractive Indices According

Yeo Kyoung Won¹, Young-Sik Yoo², Hee-Jee Yun¹

¹Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea.

Journal of Clinical Medicine

|November 27, 2024

Summary

The EVO intraocular lens (IOL) formula demonstrated superior accuracy for both normal and long axial length eyes when using the ARGOS biometry device. This formula achieved the lowest prediction errors and highest proportion of accurate outcomes.

Keywords:

intraocular lens intraocular lens power calculation formula multiple refractive indices optical biometry specific refractive index swept-source optical coherence tomography

More Related Videos

$Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity$

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

Published on: September 20, 2024

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography

Published on: July 24, 2020

Related Experiment Videos

Last Updated: Jun 6, 2025

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

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

Published on: June 6, 2017

$Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity$

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

Published on: September 20, 2024

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography

Published on: July 24, 2020

Area of Science:

Ophthalmology
Biomedical Engineering
Optics

Background:

Cataract surgery requires precise intraocular lens (IOL) power calculation.
Accuracy of IOL formulas can vary, especially in eyes with atypical axial lengths.
The ARGOS biometry device utilizes specific refractive indices for measurements.

Purpose of the Study:

To evaluate and compare the accuracy of five IOL formulas (SRK/T, Haigis, Barrett Universal II, Kane, EVO) using the ARGOS biometry device.
To assess formula performance in normal and long axial length (AL) eyes.
To determine the most accurate IOL formula for predicting refractive outcomes after cataract surgery.

Main Methods:

Retrospective review of 191 patients undergoing cataract surgery with Acrysof IQ SN60WF IOL implantation.
Biometry data obtained using the ARGOS device.
Patients categorized into normal (22.0 ≤ AL < 26.0 mm) and long (AL ≥ 26.0 mm) axial length groups.

Main Results:

The EVO formula exhibited the lowest Mean Absolute Error (MAE) and Median Absolute Error (MedAE) in the normal AL group.
EVO also showed the lowest MAE and MedAE in the long AL group.
EVO demonstrated the highest percentage of eyes within ±0.25, ±0.75, and ±1.00 D prediction error across both groups.

Conclusions:

The EVO formula is the most accurate for IOL power calculation with the ARGOS biometry device.
EVO provides the lowest prediction errors in both normal and long axial length eyes.
This finding supports the use of the EVO formula for improved refractive outcomes in a diverse patient population.