This is a special eye testing pair of glasses that allows you to experience the deterioration of visual function that can occur when you drink alcohol. It realistically simulates effects of impairment. Specially processed lenses with slits allow you to experience a sense of distance and unfocused sensation. The length and angle of the frame can be adjusted freely, so it can be worn by children and adults, and women and men. Because it uses a soft material, it is designed to be comfortable to wear without causing nose pain.