Les molécules photochromiques ont, dans des conditions normales, une forme pliée qui les rend transparentes. En absorbant la lumière ultraviolette, leur forme change, la structure moléculaire s’ouvre et absorbe la lumière visible. Les deux formes de la molécule photochromique - ouverte et fermée - existent en équilibre grâce à un lien continuellement brisé et reconstruit.
La molécule photochromique passe constamment de l’état transparent à l’état foncé. Si les verres sont exposés à des niveaux importants de lumière UV, la plupart des molécules seront à l’état ouvert, ce qui assombrira les verres. En l’absence de lumière UV, les molécules restent fermées, ce qui donne des verres clairs.
LES VERRES NEOCHROMES, QUI SONT À LA POINTE DE LA TECHNOLOGIE, SONT NATURELS ET DEVIENNENT UNE SECONDE NATURE POUR LE PORTEUR.
Avant l’exposition aux UV, le verre est dans son état le plus transparent.
Lorsque le verre est exposé pour la première fois à la lumière UV, les molécules photochromiques commencent à passer du clair au foncé.
Les verres sont pleinement activés. La transmission de la lumière, la couleur activée et l’uniformité de la couleur peuvent être évaluées à ce stade.
L’éclaircissement rapide est essentiel. Il commence lorsque la lumière UV n’atteint plus le verre. Plus l’éclaircissement est rapide, plus le verre est confortable et fonctionnel pour le porteur.
LE COMPORTEMENT DES /
VERRES NEOCHROMES
LA TEMPÉRATURE ET SON EFFET SUR LA TECHNOLOGIE PHOTOCHROMIQUE
Tous les verres photochromiques sont affectés par la température. Par temps froid, les verres photochromiques s’assombrissent davantage et mettent plus de temps à s’éclaircir. À des températures plus élevées, les verres ne foncent pas autant et s’éclaircissent plus rapidement. C’est une caractéristique de l’état d’équilibre d’un système photochromique.
Sur les verres Neochromes, une attention particulière est accordée aux performances à haute température. À haute température (33 °C / 91 °F), ils atteignent une obscurité fonctionnelle similaire à celle de nombreux verres polarisés. À cette température, le temps de décoloration est d’environ 32 secondes.
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