Gradual film fitting is different from the ordinary single or bifocal optical glasses, practice shows that the specification of the fitting is to improve the success rate of the key. To do: far-accurate, plus light feet, eyes to balance, IPD, pupil Gaoyao accurate. 1 far with the luminosity optometry, standard optometry routine procedures computer glasses Near the use of adding light inspection, the use of computer glasses cross-lattice old-fashioned optometry or empirical method (1), cross-lattice method Near the light has been corrected, 33CM computer glasses attention cross grid (combined refractometer, near with the visual chart, or near the main visual optometry have) Figure: 3 pupil height measurement Pupil Height: Distance from the horizontal position of the center of the pupil to the lowest inner groove of the lower frame. Measurement methods: A, sample labeling method Measuring the mark point to the frame of the lowest slot of the vertical distance, that is, the pupil of the high test. B, formula method H = (a-34) / 2 + 22 H for the distance from the optical center to the lower edge of the frame mm A is the upper frame edge perpendicular to the lower edge distance mm. For example: a customer selected frame on the frame edge to the lower edge of the vertical distance of 40mm The customer pupil height h = (40-34) / 2 + 22 = 25mm The customer pupil height is 25 mm. How to adapt to the progressive computer glasses Gradually to wear progressive multifocal glasses to adapt, should be static after the first indoor and outdoor. Adaptation period is generally about a week, some minutes or hours that can adapt. In general, the intellectuals to adapt to faster, faster adaptation of the young than the elderly, wearing progressive multifocal glasses faster than the early to adapt.