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Related Experiment Videos

Physiological influence on ocular photometry. A review

T DeMel1, P W Dekker, A Lechner

  • 1Photography Department, University Eye Clinic, Basel, Switzerland.

Ophthalmic Research
|January 1, 1996
PubMed
Summary

The ocular photometer (OPM) provides reproducible retinal brightness measurements, indicating changes are likely due to intraocular variations like cataract progression. This allows for accurate contrast transfer ratio assessment.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Vision Science

Background:

  • The ocular photometer (OPM) has undergone development since 1983.
  • Previous research has investigated various physiological factors influencing OPM measurements, including respiratory, circulatory, and intraocular pressure changes.

Purpose of the Study:

  • To assess the reproducibility of ocular photometer (OPM) measurements.
  • To determine if environmental factors or physiological variations significantly impact OPM readings.

Main Methods:

  • A simple reproducibility study was conducted with one observer and one subject.
  • Measurements were taken at two retinal sites over a three-week period.
  • Testing included exposure to relatively extreme temperature conditions.

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Main Results:

  • No statistically significant differences were found in OPM measurements over the three-week period.
  • Reproducibility was maintained even under varying temperature conditions.
  • This suggests that OPM readings are stable and not significantly affected by short-term external factors.

Conclusions:

  • Changes in OPM readings are likely attributable to intraocular variations, such as the progression of cataracts.
  • Dual-site measurement of retinal brightness can accurately reflect increased lens density.
  • The contrast transfer ratio derived from OPM measurements is a reliable indicator of changes within the eye.