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ABSTRACT:As a result of the recent improvement in light-emitting diode (LED) technology, the displays of the vast majority of electronic devices are now illuminated by LEDs. There are several advantages of this type of light source over its predecessors; however, recent research is giving support to the fact that prolonged exposition to the white LEDs emission in the blue spectrum may have a negative impact on visual health, as well as, on biological rhythms (circadian rhythms). As a consequence, ophthalmic lens manufacturers have recently introduced in the market innovative lenses that incorporate blue light filters, especially designed for electronic device users. In this work, the performance of different blue light filters present on commercially available ophthalmic lenses was tested and compared. Lenses were placed in front of a LED-based backlight tablet, in a similar way a common user would be reading a text on the electronic device. The absorption characteristics of the various samples from four different ophthalmic lens manufacturers were measured. Analysis of the different samples from the same manufacturer was conducted and blue light filters from different manufacturers were compared.Key words: Blue light filters, ophthalmic lenses, LED backlight screens, electronic devices, circadian rhythm RESUMEN:Como resultado de las mejoras en la tecnología LED (del inglés, light-emitting diode), las pantallas de la mayoría de dispositivos electrónicos actuales están iluminadas por LEDs. Muchas son las ventajas de esta fuente de luz sobre las fuentes predecesoras; sin embargo, algunas investigaciones recientes han puesto de manifiesto el hecho que la exposición prolongada a la emisión en la zona azul del espectro de los LEDs blancos puede tener un efecto negativo en la salud visual y en los ritmos biológicos (ritmos circadianos). Como consecuencia de ello, los fabricantes de lentes oftálmicas han introducido recientemente en el mercado lentes innovadoras que incorporan filtros de luz azul, especialmente diseñadas para los usuarios de dispositivos electrónicos. En este trabajo, se evaluaron y compararon diferentes filtros de luz azul en lentes oftálmicas comerciales. Se disponían las lentes frente a una tableta retro-iluminada con LEDs, de manera similar a como un usuario se situaría delante del dispositivo electrónico para leer un texto. Se analizó la capacidad de absorción de varias muestras de un mismo fabricante, y se comparó el resultado entre filtros azules de distintas marcas comerciales. [5] M. Argilés, G. Cardona, E. Pérez-Cabré, M. Rodríguez, "Blink rate and incomplete blinks in six different controlled hard-copy and electronic displays," Invest. Ophthalmol. Vis. Sci., 56 (11), 6679-6685 (2015).

The 3 rd central IDL Event in Spain probably gathered the largest number of activities for the 16 th May commemoration in 2021. Conferences, debates, workshops, exhibitions, light shows, and photo contests, adapted to severe constraints due to the pandemic, achieved the participation of a wide and diverse audience.