168707 20260223150113.0 doi 10.1097/OPX.0000000000001813 sideral 125404 ART-2021-125404 eng López de la Fuente, Carmen Universidad de Zaragoza (orcid)0000-0002-7471-5362 Photometric and colorimetric evaluation of phototherapy instruments for syntonic treatment of visual anomalies 2021 Significance: Ocular light exposure therapy has been used in optometric therapies to improve binocular anomalies such as accommodative or vergence dysfunctions, amblyopia therapy or to increase the visual field. Currently, syntonic phototherapy is used worldwide by behavioral optometrists, vision trainers, or occupational therapists, among others, although these treatments are supported by only a few research studies that lack consensus on the efficacy of this approach. PURPOSE: In this article, we highlight the optical characteristics of lamps without evaluating the efficacy of their use in optometric procedures.Methods: Our work analyzes four devices often used in clinical practice in terms of spectral power distribution, illuminance levels at the corneal plane, and both theoretical photopic and melanopic contributions to the visual system. Results: First, illuminance levels reaching the corneal plane depend on the characteristics of each lamp and their distance from where the eye should be positioned; for example, delta-theta filter photopic illuminance is 13.1, 93.7, 22.7, or 41.6 lux with the four evaluated devices. Second, filters or modes named the same differ in terms of their spectral power distribution. Third, substantial difference in color appearance has been found among the same configurations.Conclusions: The spectral and iluminance characteristics of syntonic systems used for vision therapy vary widely, including variations among filters with the same identifying characteristics. This provides significant sources of variability, which limit the ability to conduct evidence-based medicine clinical trials to assess the true efficacy of syntonic therapy. This study furthers our knowledge of syntonic phototherapy from a technical perspective; however, longitudinal research examining patients' evolution pre-lighting and post-lighting treatments is required to justify and understand the effects of light exposure and its impact on optometric and ocular parameters more clearly. info:eu-repo/grantAgreement/ES/MINECO-FEDER/PID2019-107058RB-I00 info:eu-repo/semantics/closedAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 2.106 2021 OPHTHALMOLOGY 40 / 62 = 0.645 2021 Q3 T2 0.561 2021 Optometry 2021 Q2 Ophthalmology 2021 Q2 2.8 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sánchez-Cano, Ana Isabel Universidad de Zaragoza (orcid)0000-0002-5621-1937 2002 647 Universidad de Zaragoza Dpto. Física Aplicada Área Óptica 98, 12 (2021), 1355-1365 Optom. vis. sci. Optometry and vision science 1040-5488 6022958 http://zaguan.unizar.es/record/168707/files/texto_completo.pdf Versión publicada 3131819 http://zaguan.unizar.es/record/168707/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:168707 articulos driver 2026-02-23-14:58:19 ARTICLE