The frame must conform to the standard size when it leaves the factory, but the standard size frame may not meet the requirements of a specific optician. In order to make the optician achieve satisfactory wearing effect, it should be adjusted according to the actual situation of each optician's head and face. Therefore, frame adjustment is usually divided into standard adjustment and target adjustment. (1) Standard adjustment The standard adjustment has nothing to do with the wearer's face shape, and the purpose is to make the mirror frame have the standard size when it leaves the factory. The adjustment follows the principle of "front to back", that is, the order from the frame to the temples, because the adjustment of the front of the frame will directly affect the shape of the back of the frame. The standard adjustment of the frame includes: the initial adjustment before the frame leaves the factory, the adjustment after the frame is displayed for a period of time, the adjustment after the trimming is completed, and the adjustment after the frame is deformed. The adjustment process is: (1) adjust the mirror angle of the mirror frame to170 ~180; (2) Adjust the pretilt angle of binocular lens ring to be equal, about 8 ~15; (3) Adjust the opening angle of temples to be equal, which is about 90 ~ 95; (4) Adjust the body and leg inclination angles of the temples on both sides to be consistent, even if the temples are parallel to each other. Make the rake angle equal, about 8 ~15; (5) Adjust the temples on both sides to keep the bending point length, vertical sag angle and vertical internal angle of the temples on both sides equal; (6) Adjust the consistency of the temples on the plane, and invert the two temples of the mirror frame on the horizontal plane, so that the two temples are parallel and the bending parts are equal, and the two temples are in parallel contact with the horizontal plane. Aft that mirror frame is turned ov, the walking ends of the two temples contact with the horizontal plane; (7) Fold the temples in half, adjust the uniformity of the temples after folding, and observe the mirror frame from the back, so that the two temples overlap each other in parallel, or only form a small included angle, the intersection point is located in the center of the mirror frame, and the angles on both sides are equal; (8) Adjust the nose pads so that the left and right nose pads are symmetrical and the height, angle and up-and-down position are moderate; (9) Adjust the tension of the hinge screw and alternately open and close the temple, which can keep the temple open without opening and closing resistance. When the frame is gently shaken, the temples can still remain in place. (2) The face of the target adjuster varies from person to person. Targeted adjustment is to adjust the mirror frame according to the wearer's face to make it close to or achieve an ideal fit. Ideal fit means that the frame of the frame is evenly placed on the nose, the temples are moderately elastic, and the weight of the frame is evenly distributed on the nose and ears. Wearing an ideal frame can minimize the wearer's feeling of wearing glasses. Correct frame fitting is also very important for improving visual comfort. In addition, when wearing glasses, the pressure or friction of the weight of glasses on the nose root and ears will affect the functions of skin, subcutaneous nerve and lymphatic vessels. Therefore, when shaping glasses, we should design the parameters of the frame according to the shape of the head and face to minimize the pressure on the skin and the stimulation to the nerves. For most modern lenses, the anteversion angle and the distance from the back vertex need to be considered when fitting, so it is more important to adjust the frame during fitting. The order of frame directional shaping is the same as that of standard shaping, and it is also from front to back. The targeted adjustment steps are: 1. Horizontal adjustment needs to consider the type of lens, and the optical center of a single lens is opposite to the pupil; The height (distance from the lower eyelid) of the sub-lenses on both sides of the double lens should be equal; The cross of the gradient lens should be opposite to the pupil. The standard plastic frame can't keep level, which shows that the wearer's face is asymmetrical and needs targeted plastic surgery. If the position of the left and right lenses is not equal, it means that the position of the wearer's ears is different. If the right eye lens is higher, it is necessary to raise the right temple or lower the left temple. On the other hand, Dallas should pay attention to the influence on the inclination angle when it comes to the auditorium. 2. Adjust the pretilt angle after wearing glasses to make the pretilt angle of eyes equal, about 8 ~ 15. From the front, the height of the left and right lenses is the same, and the lens ring does not touch the cheek when laughing. If you touch your cheeks, you should reduce the angle of leaning forward, or reshape the metal frame nose pad to increase the distance between the vertices of your back. When wearing gradient lenses, the forward tilt angle is between10 ~ 20. In addition, in order to obtain the best corrected vision, the distance between the posterior vertices should be as small as possible, about 12~ 14mm, so as to avoid touching eyelashes. 3. To adjust the external angle of the temple, it is necessary to observe whether the glasses are offset from left to right from the front of the optician and whether the distance between the vertices on both sides is equal from the top of the head; Also observe whether the distance between the temple and the temporal side of the head is appropriate. If the left eye lens is found to be close to the nose, the left temple can be adducted or the right temple can be abducted. And vice versa, Dallas to Auditorium 4. Adjust the side bend of the temple. The lateral curvature of the temple should be consistent with the shape of the wearer's head to avoid the temple being too loose or too tight on the double temporal side. 5. Adjust the length of the bending point of the temple to make it consistent with the position of the two ear tips. 6. Adjust the bending shape of the vertical length of the temple to make it consistent with the contour behind the ear and the anatomical bending of the head. (III) Adjustment of metal frames The adjustment of metal frames focuses on the adjustment of the inclination angle, external opening angle, length of bending point and vertical bending shape of nose pads and legs. The difficulty in adjusting the metal spectacle frame is the matching between the nose pad and the bridge of the nose, and the matching between the vertical part of the temple and the mastoid bone of the ear head. 1. When adjusting the external opening angle, one hand holds the temple adjusting pliers as the auxiliary pliers, and the other hand holds the flat circular pliers as the main pliers. When clamping the temple side pile head, the wrist is twisted outward to increase the external opening angle, and the wrist is twisted inward to decrease the external opening angle. 2. When adjusting the inclination angle of the leg, one hand holds the plastic pliers as the auxiliary pliers at the pile head of the mirror ring surface, and the other hand holds the plastic pliers as the main pliers in front of the leg hinge, twisting the wrist upward to reduce the inclination angle of the leg, and twisting the wrist downward to increase the inclination angle of the leg. 3. When adjusting the distance between nose pads, hold the glasses frame with one hand and hold the glasses ring up and down with thumb and forefinger respectively. The other hand-held round-nosed pliers clamp the lower part of the handle and twist the wrist to the nasal side to reduce the spacing, and twist the wrist to the temporal side to expand the spacing. After adjusting the distance between nose pads, please indicate that it is reproduced from www.Sigo.cn SIGO Sightseeing Glasses Network.