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Related Experiment Videos

CPF-550 vs. C-Lite: a comparison study.

P P Bither1, J D Hurt

  • 1Indiana University Optometry Clinic, Indianapolis 46202.

Journal of the American Optometric Association
|August 1, 1988
PubMed
Summary

Patient satisfaction with Corning CPF-550 lenses was evaluated. Surprisingly, most patients preferred neutral gray C-Lite lenses, questioning the exclusive benefit of short-wavelength light attenuation in low vision aids.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Low Vision Rehabilitation

Background:

  • The Corning CPF-550 lens is designed to selectively attenuate short wavelengths of light.
  • Its effectiveness in improving vision for low vision patients is often attributed to this specific light filtering property.

Purpose of the Study:

  • To assess patient satisfaction with the Corning CPF-550 lenses.
  • To investigate whether the success of CPF-550 lenses is solely due to their short-wavelength light attenuation.
  • To compare patient preference between CPF-550 lenses and neutral density photochromic lenses.

Main Methods:

  • Part 1: Nine low vision patients currently using CPF-550 lenses evaluated their performance.
  • Part 2: Seven of these patients compared their CPF-550 lenses with custom C-Lite lenses featuring a neutral gray tint.

Main Results:

  • Initial patient feedback on CPF-550 lenses was generally favorable.
  • However, six out of seven patients preferred the neutral density C-Lite lenses over the CPF-550 filter in a direct comparison.
  • This suggests that factors other than, or in addition to, short-wavelength attenuation may influence patient satisfaction.

Conclusions:

  • While CPF-550 lenses show promise, their success may not be exclusively linked to selective short-wavelength light filtering.
  • Neutral gray photochromic tints may offer comparable or superior satisfaction for some low vision patients.
  • Further research is warranted to understand the optimal optical characteristics for low vision lens prescriptions.

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