Two studies showing similar positive results for the Gen S prescription index 1.6 lens compared to a 1.6 index clear lens, combined with in-house testing, have sparked claims from lens manufacturer, Transitions Optical. The company’s latest innovation, Gen S, promises to “redefine wearers’ visual performance” and revolutionise the lens category by setting a new standard for prescription lenses, it said.
The randomised controlled study of 30 healthy subjects, led by Professor Billy Hammond from the Vision Sciences Laboratory at the University of Georgia, US, examined Gen S’ performance, measuring the impact of light stress (discomfort, glare and photo stress recovery) on visual quality. The research team found visual quality improved, especially in challenging light conditions in subjects wearing the grey Gen S index 1.6 lens (39% faster from intense bright light) compared with a standard 1.6 index clear lens with a premium anti-reflective coating.
Similarly, a Spanish study, led by Professor Pablo Artal from the University of Murcia, found there was 39.5% improved contrast sensitivity and 40% faster vision recovery during fade-back in the Gen S compared to a Gen 8 lens.











