Transparency: Where research meets demand It is often assumed that a window pane, the windshield of a car or your eyeglass lenses are completely transparent. The truth is they all produce unpleasant reflections from surrounding lights. For instance, standard eyeglass lenses only transmit 92% of visible light. The rest is pure reflection: mirror effects, double vision, glare... Reflections: Harmful to your vision In addition to hiding your eyes, the reflection on your lenses is a major source of daily eyestrain and discomfort. Crizal lenses: Improving your eye comfort The Crizal eyeglass lens treatment is the result of a high-tech manufacturing process unique to Essilor. It provides the best transparency and the most efficient protection. Crizal combines three important benefits: transparency, scratch resistance and easy cleaning.