Glasses matching refers to the activity of matching the eyes with appropriate glasses. Lens matching includes optometry, lens selection, lens frame selection, polishing and assembly. The optometry is carried out in the morning, which is conducive to the accuracy of optometry. Lens materials are mainly glass and resin. The frame materials are mainly plastic and metal. When matching glasses, the shape of the lens should be corrected with a grinder to make it match the inner basket of the lens frame.
Process steps
Optometry: It is recommended to perform optometry in the morning, because after a night's rest, less eyes are used in the morning to avoid visual fatigue.
Lens: mainly glass and resin. The main feature of glass material is high light transmittance, which makes users feel clearer and brighter. The main characteristics of resin material are light and not easy to break.
Frame: TR, plate, metal and titanium are the main materials. Plastic products are light and not easy to cause allergic symptoms; The panel has many colors and fashionable collocation; The metal products are firm, durable and not easy to deform; The titanium frame is vacuum plated and light in weight.
Lens processing: use the grinding machine and other equipment to correct the shape of the lens so that it is consistent with the inner basket of the lens frame.
Combination principle
The lens is dominated by the frame
When selecting the lens frame, the interaction with the lens should be considered: the larger the size of the lens frame, the larger the lens frame diameter, the larger the required lens blank, and the thicker and heavier the cut edge lens. Therefore, high lenses and aspherical lenses need small, symmetrical, round or square frames, and a frame with a long meridian is not suitable. The gradient mirror needs a frame of appropriate height, that is, the vertical distance from the center of the pupil to the bottom of the inner groove of the lens circle is at least 22 mm.
For monocular lenses, especially aspherical lenses, the lens frame shall be selected so that when the wearer is looking straight up, the visual axis can pass above the central horizontal line. If the distance between the passing point and the central horizontal line is 1 mm corresponding to 2 degrees of the front inclination, the optical center should be located on the central horizontal line when wearing.
For highly astigmatic lenses, the meridian direction of the specularity needs to be considered. For example, for the+6.00/-4.00 * 180 lens, the narrower and higher lens frame needs to be selected. The height of the lens frame should be larger, so that the edge thickness at the top and bottom will not be too thick. For the+6.00/- 4.00 * 90 lens, the lens frame with relatively wide and shallow height should be selected.
Comfort of wearing glasses
The comfort of wearing should also be taken into consideration when selecting a suitable frame. The factors affecting wearing comfort include the weight of lens frame and glasses, which is not only determined by the weight of lens frame materials, but also affected by the size and thickness of lens frame and lens. In addition, the fitting of the frame will also affect the wearing comfort, so it is necessary to select and adjust the frame correctly. The importance of the comfort of glasses frame wearing cannot be ignored. The number of people complaining about the discomfort of glasses frame wearing is no less than that of glasses vision. The purpose of glasses should be taken into consideration when selecting frames.