Trial reportOphthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)2025
The effects of a HEV-filtering contact lens on the brightness of natural images.
Trial report in Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
3 citing papers in PubMed.
- The effects of a HEV-filtering contact lens on the brightness of natural images.Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2025Trial
- Blue-Light Filters in Eye Care: A State-of-the-Art Review.Medical sciences (Basel, Switzerland) · 2026Review
- Blue-Light Filtering Increases the Brightness of Natural Images in Pseudophakic Adults.Journal of ophthalmology · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
Abstract
purposeYellow 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.
methodsA 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.
resultsThe 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.
conclusionThe 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.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.