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

Distance Corrections

Distance Corrections

To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...

You might also read

Related Articles

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

Sort by

Same author

Associations Among the Gradient Refractive Index of the Lens, Axial Length, and Refractive State in the Developing Murine Eye.

Investigative ophthalmology & visual science·2026

Same author

Lens shape change is influenced by zonular anchorage and stretching mechanism.

Experimental eye research·2026

Same author

Roadmap on advances in visual and physiological optics.

Journal of optics (2010)·2025

Same author

Refractive index gradient in the lens: reflections on form and function and on the lens paradox.

Frontiers in ophthalmology·2025

Same author

Investigating the effect of capsular thickness and material properties on biomechanical and optical parameters in eye models.

Experimental eye research·2025

Same author

Central optical power of the isolated human lens without zonular tension.

PloS one·2025

Search research articles

Related Experiment Video

Updated: Mar 11, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

A Comparative Analysis of Goldmann Tonometry Correction.

Magdalena Asejczyk-Widlicka¹, Wieslaw Srodka, Barbara K Pierscionek

¹*Department of Optics and Photonics †Deformable Body Mechanics Faculty Unit, Wroclaw University of Technology, Smoluchowskiego, Wroclaw, Poland ‡School of Life Sciences, Faculty of Science, Engineering and Computing, Kingston University London, UK.

Journal of Glaucoma

|December 2, 2016

Summary

Correction formulas for Goldmann applanation tonometry (GAT) show varying accuracy in primary open-angle glaucoma patients. The best formula depends on intraocular pressure (IOP) levels, with specific models performing better at different IOP ranges.

More Related Videos

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

$Subjective Refraction Test Using a Smartphone for Vision Screening$

Subjective Refraction Test Using a Smartphone for Vision Screening

Published on: October 18, 2024

Related Experiment Videos

Last Updated: Mar 11, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

$Subjective Refraction Test Using a Smartphone for Vision Screening$

Subjective Refraction Test Using a Smartphone for Vision Screening

Published on: October 18, 2024

Area of Science:

Ophthalmology
Biomedical Engineering
Optometry

Background:

Intraocular pressure (IOP) measurement using Goldmann applanation tonometry (GAT) relies on assumptions about corneal properties.
Variations in corneal curvature and thickness can affect GAT accuracy.
Several correction formulas have been developed to account for corneal biomechanics.

Purpose of the Study:

To evaluate the in vivo accuracy of different IOP correction formulas in primary open-angle glaucoma (POAG) patients.
To compare corrected GAT IOP measurements with those from Pascal dynamic contour tonometry (DCT).
To identify the most accurate correction formula based on IOP levels.

Main Methods:

108 POAG participants (39-81 years) underwent ophthalmologic examinations.
IOP was measured using both GAT and DCT.
Six different GAT correction formulas were applied.
Results were analyzed and compared between GAT (corrected) and DCT measurements.

Main Results:

For IOP values up to 29 mm Hg, two formulas demonstrated minimal and similar mean differences and standard deviations compared to DCT.
For IOP values of 30 mm Hg and above, a formula incorporating corneal buckling showed the closest agreement with DCT measurements.
Formula performance varied significantly depending on the IOP range.

Conclusions:

The accuracy of IOP correction formulas in POAG is variable.
The choice of the most appropriate correction formula is dependent on the measured IOP.
Dynamic contour tonometry offers a corneal-independent method for IOP assessment.