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Related Experiment Videos

An infrared eccentric photo-optometer

A Roorda1, W R Bobier, M C Campbell

  • 1School of Optometry, University of Waterloo, Ontario, Canada. aroorda@cvs.rochester.edu

Vision Research
|November 3, 1998
PubMed
Summary
This summary is machine-generated.

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This study introduces an objective infrared optometer using eccentric photorefraction. The device accurately measures refractive state and accommodation, showing high repeatability for objective eye measurements.

Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Vision Science

Background:

  • Accurate refractive state and accommodation measurement are crucial for vision correction and understanding visual function.
  • Traditional methods often rely on subjective responses or complex procedures.
  • Objective optometry aims to provide faster, more precise, and less intrusive eye assessments.

Purpose of the Study:

  • To design and validate an objective infrared optometer based on eccentric photorefraction.
  • To assess the repeatability and accuracy of the developed instrument for measuring refractive state.
  • To evaluate the instrument's capability in measuring static and potentially dynamic accommodation.

Main Methods:

  • An objective infrared optometer was designed using eccentric photorefraction principles.

Related Experiment Videos

  • A CCD camera and infrared light source imaged the pupil through a Badal optometer.
  • The accommodative state was determined by measuring the slope of light distribution and adjusting camera position to achieve zero slope, indicating conjugacy with the retina.

    • Main Results:

    • The instrument demonstrated high repeatability for refractive state measurements in cyclopleged eyes (< 0.05 D).
    • Static accommodative responses in three subjects aligned with expected stimulus/response measures in both closed and open-loop conditions.
    • The optometer maintained constant irradiance, sensitivity, and focal settings across different camera positions.

    Conclusions:

    • The designed objective infrared optometer provides a repeatable and accurate method for assessing refractive state.
    • The instrument shows promise for measuring static accommodation and can be adapted for dynamic accommodation analysis.
    • This objective optometry approach offers a valuable tool for clinical and research applications in vision science.