I have two pairs of Zurich's.  One is Rose tint that goes over prescription glasses and the second pair is the small type and is the dark gray tint that I use when wearing my contacts.   The dark gray is perfect for bright sunny days.  When driving in the car, I have problems seeing the radio's green LCD screen or GPS screen because they block a lot of light.  The Rose tint is less light restrictive and is a good for any day and different conditions.  The Zurich web site is right on the money about their recommended light conditions for each tint.</p>

By the way, I bought on the Zurich's after my doctor told me that I have started to develop cataracts in the last five years and guess what I have been doing in the last five years?   yes, flying RC models.</p>