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Purpose <p>Yellow filters, including high-energy-visible (HEV) filtering lenses, have been thought to increase the subjective brightness of real-world scenes, but laboratory results are mixed. This study used a brightness matching technique modified to present natural images using a broad spectrum of wavelengths: a visibly clear control contact lens was compared to a contact lens containing a HEV-filtering additive.</p> Methods <p>A total of 121 subjects were tested (mean age = 33.8 ± 13.6 years). A stratified, controlled, prospective, randomised, double-masked, bilateral, non-dispensing, crossover design was used. Participants attended two study visits separated by a washout period and were randomly assigned to wear a HEV-filtering contact lens or a clear control lens binocularly, counterbalanced on the second visit. Spherical (<i>n</i> = 41), multifocal (<i>n</i> = 40) and toric (<i>n</i> = 40) soft contact lenses were tested. Ten natural scenes were presented using a slide projector with a 550-watt xenon light source. An adjustable comparison (broadband but short-wave deficient), produced using parallel optics with a 1000-watt xenon source, was varied based on the subject's judgement to match the brightness of the adjacent natural image. Three ascending/descending trials for each image were used to obtain the match.</p> Results <p>The amount of energy needed to match the natural images was consistently (i.e., across all images and subject groups) higher with the contact lenses that contained the HEV-filter. Additionally, estimated log relative energy differences between HEV- and non-HEV-filter lenses were 0.13, 0.14 and 0.17 for spherical, multifocal and toric lenses, respectively.</p> Conclusion <p>The collection of images appeared ≈12% brighter (averaged across spherical, multifocal and toric lenses on a log scale) when wearing the HEV-filtering lenses; this translates to about 40% more energy needed to match the comparison field with the adjacent images. These results illustrate that lenses filtering HEV light are capable of increasing the subjective brightness of a naturalistic scene.</p>

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The effects of a HEV-filtering contact lens on the brightness of natural images

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月29日

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  • Billy R. Hammond,
  • John R. Buch,
  • Patricia Martin,
  • Wright Shamp,
  • Jacob B. Harth,
  • Cameron Wysocky,
  • Lisa M. Renzi-Hammond

摘要

Purpose

Yellow filters, including high-energy-visible (HEV) filtering lenses, have been thought to increase the subjective brightness of real-world scenes, but laboratory results are mixed. This study used a brightness matching technique modified to present natural images using a broad spectrum of wavelengths: a visibly clear control contact lens was compared to a contact lens containing a HEV-filtering additive.

Methods

A total of 121 subjects were tested (mean age = 33.8 ± 13.6 years). A stratified, controlled, prospective, randomised, double-masked, bilateral, non-dispensing, crossover design was used. Participants attended two study visits separated by a washout period and were randomly assigned to wear a HEV-filtering contact lens or a clear control lens binocularly, counterbalanced on the second visit. Spherical (n = 41), multifocal (n = 40) and toric (n = 40) soft contact lenses were tested. Ten natural scenes were presented using a slide projector with a 550-watt xenon light source. An adjustable comparison (broadband but short-wave deficient), produced using parallel optics with a 1000-watt xenon source, was varied based on the subject's judgement to match the brightness of the adjacent natural image. Three ascending/descending trials for each image were used to obtain the match.

Results

The amount of energy needed to match the natural images was consistently (i.e., across all images and subject groups) higher with the contact lenses that contained the HEV-filter. Additionally, estimated log relative energy differences between HEV- and non-HEV-filter lenses were 0.13, 0.14 and 0.17 for spherical, multifocal and toric lenses, respectively.

Conclusion

The collection of images appeared ≈12% brighter (averaged across spherical, multifocal and toric lenses on a log scale) when wearing the HEV-filtering lenses; this translates to about 40% more energy needed to match the comparison field with the adjacent images. These results illustrate that lenses filtering HEV light are capable of increasing the subjective brightness of a naturalistic scene.