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 smaller than average, small size is the safest choice. Note that the size of the lens also decide the angle between your eye and the mirror.