Aqua Sphere Seal XP goggles fitted with clear lenses are designed to provide the greatest visibility while swimming indoors or in low light situations. The Seal XP is a hybrid goggle that combines the superior visibility and exceptional comfort of the Seal Mask with the low profile and hydrodynamics of the Kaiman Goggles. It has a flexible, one-piece frame and comfortable, watertight skirt that provides for hours of swimming and water sports enjoyment. The low profile, wrap-around design of the Seal XP creates less drag, has greater hydrodynamics and is ideal for fitness swimming or swim training.
I have used this type for many years now. Before each swim I wash with a little Fairy Liquid and rinse, then wet with clean water before putting them on. I have just completed a 5k swim and they remained crystal clear throughout. I always have a spare pair of a different colour (so I know which is which!)because after a couple of years they will start to leak (not unreasonable!), and I don't want to be caught out at an event.