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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

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Visual disruption using the thermal lensing effect in the human eye: pilot study.

Erica L Towle¹, Paul V Garcia, Peter A Smith

¹Air Force Research Laboratory, Fort Sam Houston, Texas 78234, USA. eweber@utexas.edu

Journal of Biomedical Optics

|October 17, 2012

Summary

This summary is machine-generated.

Near infrared (IR) light can cause temporary vision changes in humans via thermal lensing. This pilot study shows that sufficiently high IR laser exposure induces transient visual distortion, establishing power guidelines.

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Area of Science:

Ophthalmology
Biophysics
Laser-tissue interactions

Background:

Near-infrared (IR) light absorption in the eye's preretinal media causes transient temperature increases.
These temperature changes can alter the local refractive index, leading to thermal lensing.
Previous studies demonstrated thermal lensing in animal and artificial eye models.

Purpose of the Study:

To investigate if near-infrared (IR) laser exposure induces observable visual changes in human subjects.
To explore the phenomenon of thermal lensing in the human eye.
To establish preliminary guidelines for IR laser power levels that affect human vision.

Main Methods:

A pilot study involving eight human subjects.
Exposure to a near-infrared (IR) laser at controlled power levels below the established safe limit.
Subjective reporting of visual changes and distortions.

Main Results:

Near-infrared (IR) laser exposure induced transient visual distortion in human subjects at sufficiently high power levels.
The observed visual changes, while varying between subjects, were temporary.
A general guideline for the power required to induce significant visual effects was determined.

Conclusions:

Thermal lensing can induce observable, transient visual distortions in human subjects.
The study provides initial data on the human visual response to IR laser exposure.
Further research is warranted to fully understand the implications for optical safety and potential applications.