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Related Experiment Videos

Do long wavelength pass filters improve low vision performance?

S J Leat1, R V North, H Bryson

  • 1Laboratory of Experimental Optometry, University of Wales College of Cardiff, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 1, 1990
PubMed
Summary
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Band-pass tints may improve contrast vision in some eye conditions by reducing light scatter. The Corning CPF 511 lens showed the most benefit, particularly when glare was present.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Band-pass tints are hypothesized to enhance contrast performance in specific ocular conditions.
  • Understanding the impact of tinted lenses on visual acuity is crucial for managing visual impairments.

Purpose of the Study:

  • To investigate the effect of band-pass tints on contrast visual acuity (VA) in various ocular conditions.
  • To evaluate the efficacy of Corning CPF 511, 527, and 550 lenses, and neutral density (ND) filters with and without glare.

Main Methods:

  • Grating visual acuity (VA) was measured for targets with varying contrasts.
  • The study assessed the performance with specific band-pass filters and ND filters, both in the presence and absence of glare.

Main Results:

Related Experiment Videos

  • Patients with anterior segment conditions generally showed improved VA with band-pass filters, but not ND filters.
  • The Corning CPF 511 lens provided the most frequent improvement in VA, followed by CPF 527 and CPF 550.
  • Individuals with retinitis pigmentosa or diabetic retinopathy rarely experienced benefits from the tested tints.

Conclusions:

  • Band-pass tints may improve vision in certain ocular conditions by reducing intraocular light scatter.
  • The presence of glare is an important factor to consider when evaluating the suitability of tinted lenses.
  • The CPF 511 lens appears most promising for enhancing contrast VA in specific patient groups.