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The hess screen test.

Gill Roper-Hall

The American Orthoptic Journal

|December 15, 2010

Summary

This summary is machine-generated.

The Hess screen test, developed by Nobel laureate Walter Rudolf Hess, measures ocular deviation using color filters and a tangent scale. This neurophysiological tool charts the range of eye rotation for each eye.

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Area of Science:

Ophthalmology
Neurophysiology

Background:

The Hess screen test was introduced in 1908 by neurophysiologist Walter Rudolf Hess.
Hess received the Nobel Prize for his work on the autonomic nervous system.
The test has undergone modifications since its inception.

Purpose of the Study:

To describe the design and methodology of the Hess screen test.
To explain the principles behind the test's measurement of ocular deviation.

Main Methods:

Utilizes a black screen with a square-meter tangent scale.
Employs color dissociation with red/green complementary filters to maximize ocular deviation.
Involves projecting a red target and having the patient project a green light, recording plots for each eye.

Main Results:

Generates a two-dimensional chart from a virtual sphere using tangent coordinate lines.
The resulting chart displays the inner and outer ranges of ocular rotation for each eye.

Conclusions:

The Hess screen test provides a quantitative method for assessing ocular alignment and deviation.
The test's reliance on color dissociation and tangent mapping allows for detailed charting of eye movements.