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Related Experiment Videos

Correcting lens system for perimetry

D B Henson1, R A Earlam

  • 1Department of Optometry and Vision Sciences, University of Wales College of Cardiff, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1995
PubMed
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A novel head-mounted lens system improves perimetry accuracy by correcting refractive error and test distance. This system overcomes limitations of traditional lenses, preventing visual field test artifacts.

Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Science

Background:

  • Accurate visual field testing (perimetry) requires correction for refractive error and specific test distances.
  • Conventional methods using trial lenses are often inadequate, lacking full aperture coverage and leading to artifacts.

Purpose of the Study:

  • To develop and introduce a specialized head-mounted lens system for perimetry.
  • To address the limitations of existing lens systems in perimetry assessments.

Main Methods:

  • A novel head-mounted lens system was designed, adapted from a presbyopia demonstration set.
  • The system aims to provide accurate refractive correction and accommodate perimeter test distances.

Main Results:

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  • The developed system effectively corrects for refractive errors during perimetry.
  • It overcomes the issue of limited lens aperture and prevents lens rim artifacts seen with trial lenses.
  • The head-mounted design ensures suitability for use with most standard perimeters.

    • Conclusions:

    • The new perimetry lens system offers a practical solution for accurate visual field testing.
    • It enhances patient comfort and data reliability by eliminating common artifacts.