Have spent many years sailing here in the Caribbean and have worn sunglasses sailing every day -- My favorites have progressed from Serengetti Drivers to Vuarnet Nautilux to Costa del Mars - [my lenses seem to have a brown tone.]
I found the grey lenses Serengettis to be the most soothing on my eyes, the blue lenses Vuarnets the most comfortable and these brown lenses Costas the most effective at distinguishing water depth by color.