When selecting a swimming goggle or swimming mask, one must take into consideration several factors. Below are a few factors to consider:
Lens Color
The location where one is swimming will have an impact on the tint of lenses that a swimmer will select. One who swims mostly in an indoor pool should consider clear lenses since most indoor pools are not very bright and they are not too dark. A swimmer wearing swimming goggles with tinted lenses in an indoor pool may make the pool appear to be darker. Also, one who swims in a pool or body of water in the night time may also be better off with swimming goggles or a swimming mask with clear lenses.
One who swims outside may prefer swimming goggles or a swimming mask that has tinted lenses (or mirrored lenses) which will protect the eyes against the bright rays of the sun. Additionally, if competing in a triathlon, many triathletes already are challenged with sighting buoys that are on the course. Swimming goggles with tinted lenses are helpful for those early morning swim legs that are notorius for blinding sun light which can impair one's ability to sight buoys.
Frame Type
Depending on the swimmer, it may make sense to go with one frame type over another. Female swimmers with petite facial features are often better off selecting goggles labeled as petite and even junior sized goggles. On the other side of the spectrum, swimmers who have bigger facial features or who prefer more peripheral vision should consider a swim mask or miniature mask.