TriEye VIEW comes in two sizes, medium and small. The lens is a rather big panoramic lens which looks good on an average adult face, and to big on a small adult face. For that reason you can choose between the two sizes and there is a big overlap where both small and medium will fit well.
As a general role, medium size will fit all adult males with an average head/face size. Medium will also fit most females with an average head/face size but for most females small size is also an alternative.
If you have a head/face significantly