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Related Experiment Videos

[Predicting visual acuity in media opacities and uncorrectable refractive errors. Assessing so-called "retinal visual

B Lachenmayr1

  • 1Universitäts-Augenklinik, München, Bundesrepublik Deutschland.

Fortschritte Der Ophthalmologie : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|January 1, 1990
PubMed
Summary

Assessing macular function with media opacities requires specialized tests beyond basic vision screening. Quantitative subjective and objective methods, including interferometry and visual evoked cortical potential (VECP), offer better predictions of visual acuity.

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Area of Science:

  • Ophthalmology and Visual Neuroscience
  • Optics and Image Formation
  • Retinal Physiology

Context:

  • Visual system's modulation transfer function involves optical image formation, light scattering, and neuronal processing.
  • Media opacities and refractive errors complicate the prediction of macular function.
  • Standard tests are insufficient for evaluating macular function in compromised optical pathways.

Purpose:

  • To review and categorize methods for assessing macular function when optical image quality is impaired.
  • To differentiate between qualitative and quantitative subjective and objective tests.
  • To highlight emerging psychophysical and objective tests for improved visual acuity prediction.

Summary:

  • Qualitative subjective tests include Maddox rod, Amsler grid, and entoptic phenomena.

Related Experiment Videos

  • Quantitative subjective methods utilize potential acuity meters (PAM) and interferometers.
  • Objective tests like flash visual evoked cortical potential (VECP) offer semiquantitative predictions, with pattern VECP and focal ERG showing future promise.

    • Impact:

    • Provides a framework for selecting appropriate tests to predict visual potential prior to ocular surgeries.
    • Guides the development of more accurate diagnostic tools for visual function assessment.
    • Enhances clinical decision-making in managing patients with visual impairments due to media opacities.