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A simple infra-red optometer for accommodation studies.

W N Charman, G Heron

The British Journal of Physiological Optics

|January 1, 1975

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This study details a simple, continuously-recording optometer using the Scheiner principle. It offers good time response for dynamic measurements and achieves adequate linearity through parameter selection.

Area of Science:

Ophthalmology
Optical Engineering
Biomedical Instrumentation

Background:

Dynamic eye measurements require precise and responsive instruments.
Existing optometers may lack simplicity or adequate time response for certain applications.

Purpose of the Study:

To describe the design of a continuously-recording optometer with minimal complexity.
To evaluate its performance for dynamic measurements.

Main Methods:

The optometer utilizes the Scheiner principle.
System parameters were optimized through theoretical and experimental analysis.
Continuous recording capability was implemented.

Main Results:

The designed optometer exhibits minimal mechanical and electronic complexity.

Related Experiment Videos

It demonstrates good time response suitable for dynamic measurements.

Adequate linearity was achieved by selecting appropriate system parameters.

Conclusions:

The developed continuously-recording optometer is a practical tool for dynamic eye measurements.
Its performance is influenced by the Scheiner principle and defocus effects.
The design offers a balance of simplicity, responsiveness, and linearity.