The small slits not only reduced reflected light but also helped the wearer see better. In terms of their mechanism of action, the slits in snow goggles resemble a pinhole camera (camera obscura): by passing through a tiny aperture, light is better focused, which sharpens vision. However, the main drawback of Inuit Snow Goggles is the limitation of the wearer’s field of view, which could lead to tripping or failing to notice an approaching danger.