Photochromic lens is the color changing lens from light dark with UV light. It can protect eyes from UV-B light which cause cataract and can used as sunglass in the summer since it can cut off 70~80% of sun light. Surface coating technique was used to develop lens which has 70% light transmittance and fading time of color changing is within 5 min. Various color lens were developed such as blue, green, brown, violet, yellow and red etc.