En condiciones normales, las moléculas fotocromáticas tienen una forma plegada que las hace transparentes. Sin embargo, cuando absorben la luz ultravioleta, la estructura molecular se abre y absorbe la luz visible. Ambas formas de la molécula fotocromática —la abierta y la cerrada— coexisten en un equilibrio gracias a un enlace que se rompe y se crea de nuevo continuamente.
La molécula fotocromática cambia constantemente entre la forma clara y la oscura. Si la lente está expuesta a unos niveles de luz UV elevados, la mayoría de las moléculas estarán en su forma abierta, lo que oscurecerá la lente. Si no hay luz UV, las moléculas permanecerán cerradas, y la lente será clara.
LAS LENTES DE NEOCHROMES, CON TECNOLOGÍA VANGUARDISTA, SON TAN NATURALES QUE EL USUARIO SE OLVIDARÁ DE QUE LAS LLEVA PUESTAS.
Antes de la exposición a la luz UV, la lente está en su estado más clara.
La primera vez que la lente está expuesta a la luz UV, las moléculas fotocromáticas empiezan a cambiar de claras a oscuras.
Las lentes están en el punto más alto de su activación. La transmisión de la luz, el color activado y la uniformidad del tono pueden evaluarse en esta forma.
Este paso es crítico. Comienza cuando la luz UV ya no incide directamente en la lente. Cuanto más corto es el aclarado, más cómoda y funcional resulta la lente para el usuario.
COMPORTAMIENTO /
NEOCHROMES
EL EFECTO DE LA TEMPERATURA EN LA TECNOLOGÍA FOTOCROMÁTICA
La temperatura afecta a todas las lentes fotocromáticas. Cuando hace frío, las lentes fotocromáticas se oscurecen más y tardan más en volver a aclararse. Cuando hace más calor, las lentes no se oscurecen tanto y vuelven a aclararse más rápido. Esta es una característica del estado de equilibrio en un sistema fotocromático.
En las lentes Neochromes, se le presta especial atención al rendimiento a altas temperaturas. Con una temperatura de 33 °C (91 °F), alcanzarán una oscuridad funcional, similar a la de muchas lentes polarizadas. Con esta temperatura, el tiempo de aclarado es de unos 32 segundos.
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