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Convergence accommodation.

D Kersten, G E Legge

Journal of the Optical Society of America

|March 1, 1983

Summary

This summary is machine-generated.

This study found that eye accommodation, the process of focusing, is linearly related to vergence angle but not lateral gaze. This convergence accommodation is consistent across different viewing conditions.

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Area of Science:

Ophthalmology
Vision Science
Physiological Optics

Background:

Accommodation is the eye's ability to change focus.
Convergence accommodation describes the accommodative response to binocular eye convergence.
Understanding these responses is crucial for visual function.

Purpose of the Study:

To measure steady-state accommodation responses as a function of vergence angle and lateral gaze.
To investigate the relationship between convergence accommodation and lateral gaze direction.
To compare convergence accommodation with responses to other visual stimuli.

Main Methods:

Utilized a binocular laser optometer for precise measurements.
Employed small speckle patterns as fusional stimuli in a dark field to isolate accommodation.

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Measured accommodation for vergence angles from 0 to 25 degrees and lateral gaze angles of +32, -32, and 0 degrees.

Main Results:

Average accommodation showed a linear relationship with vergence angle.
Accommodation response was independent of the angle of lateral gaze.
The mean convergence accommodation/convergence ratio was 0.9 diopters per meter-angle.
Night myopia was observed at reduced luminance, but not for convergence accommodation.

Conclusions:

Convergence accommodation is primarily driven by vergence angle, not lateral gaze.
Laser-speckle targets provide a reliable method for studying convergence accommodation.
Convergence accommodation appears distinct from the mechanisms causing night myopia.