TR90 frame CR39 lens non-polarized Lens width: 59 millimeters Lens height: 44 millimeters Arm: 134 millimeters Peple who wants to look far, middle, near area without taking off the glasses need a multifocus reading glasses. This bring you conveninece for working, playing, reading, driving, studying and so on. Asymptotic multifocal glasses are the upper optical area of the lens used to look far and the lower optical area used to look near. The degree of the middle gradually change, which used to look at the intermediate area. As it is a pair of progressive multifocal glasses, so generally speaking, you need about a week of adaptation. The frame is made of the most comfortable material. You will feel no pressure on your ears. The lens are CR39 lens which are better than the normal progressive multifocus lens. Please kindly note that the pupil distance for the mass production glasses is 63mm(±2mm) and there is no astigmatism of these mass production glasses.So if your pupil distance is special or you have astigmatism under 2.00, please buy customized glasses and then send us the data of your eyes including the magnification and pupil distance.