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

$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

Hess's Law

Hess's Law

There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.

You might also read

Related Articles

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

Sort by

Same author

Six-Month Visual Outcomes in Pediatric Optic Neuritis: A Multicenter Study From South Korea.

Journal of neuro-ophthalmology : the official journal of the North American Neuro-Ophthalmology Society·2026

Same author

Creation of Three New Optotypes Chart and Evaluation of the Reliability on Healthy Subjects.

Clinical ophthalmology (Auckland, N.Z.)·2026

Same author

Myopia Management Consensus Statement in South Korean Children 2025 by the Korean Myopia Society for the Korean Association for Pediatric Ophthalmology and Strabismus.

Korean journal of ophthalmology : KJO·2026

Same author

Recent Practice Patterns in Pediatric Myopia Control: Insights from a Nationwide Survey of South Korean Pediatric Ophthalmologists.

Korean journal of ophthalmology : KJO·2025

Same author

Refining Intraocular Lens Power Calculations With Prediction Modifications: A Multiformula Analysis in High-Power Lenses.

American journal of ophthalmology·2025

Same author

The Pedigree Study of Leber's Hereditary Optic Neuropathy in Korean Population.

Seminars in ophthalmology·2025

Search research articles

Related Experiment Video

Updated: May 11, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Fresnel prism on hess screen test.

Kyung Min Koh¹, Ungsoo Samuel Kim

¹Department of Ophthalmology, Kim's Eye Hospital, Youngdeungpo 4th 156, Youngdeungpo-gu, Seoul 150-034, Republic of Korea.

Case Reports in Ophthalmological Medicine

|May 28, 2013

Summary

This study shows that using a Fresnel prism with the Hess screen test can help diagnose eye movement abnormalities, especially in cases of significant strabismus after surgery.

Area of Science:

Ophthalmology
Neuro-ophthalmology
Strabismus Diagnosis

Background:

Diplopia and esotropia can occur post-cataract surgery.
Standard Hess screen tests may be inconclusive with large deviations.

Purpose of the Study:

To evaluate the utility of the Hess screen test with a Fresnel prism for diagnosing extraocular movement abnormalities.
To determine if Fresnel prisms can facilitate the Hess screen test in patients with significant strabismus.

Main Methods:

A 65-year-old male with post-cataract surgery diplopia and esotropia underwent a standard Hess screen test.
The test was repeated using a 20 prism diopter (PD) base-out Fresnel prism due to initial inconclusive results.
Eye movements were assessed for deficits.

More Related Videos

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Published on: October 27, 2017

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Published on: August 25, 2016

Related Experiment Videos

Last Updated: May 11, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Published on: October 27, 2017

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

Published on: August 25, 2016

Main Results:

The standard Hess screen test indicator was out of bounds, preventing completion.
With the Fresnel prism, an abduction deficit was observed in the right eye.
The findings suggested right abducens nerve palsy.

Conclusions:

Performing the Hess screen test with a Fresnel prism is useful for diagnosing ambiguous extraocular movement abnormalities.
Fresnel prisms enable the Hess screen test for strabismus greater than 15 PD.
This technique may also benefit the Lancaster screen test.