Each color of lens is suited for specific situations. You will notice that many of the color properties overlap with each other. Whether they are performance, therapeutic, or fashion tints, each color causes a person to perceive their surroundings differently. People who wear blue tinted glasses maybe just for fashion purpose. However, blue colored lenses are also being researched as a therapeutic tool for the treatment of epilepsy. Studies have been conducted with both cross polarized lenses (the axes of polarization are perpendicular), parallel polarization (axes of polarization are the same), and without polarization. Epileptic seizures have been reduced in some patients with the varieties of blue lenses, while other patients have experienced no relief with this therapy.