Each Part Of Eyeglasses Match The Face And Head Shape Of The Wearer

After the glasses are processed, it is necessary to observe whether the frame connection is firm, whether there is looseness, whether the legs of the glasses are symmetrical when opened, and whether they are balanced when placed on the table. Each part should match the face and head shape of the wearer, especially the hanging ears of the legs should be adjusted according to each person's situation to ensure the cheapest eyeglasses are comfortable to wear.

Measuring the refractive power of lenses requires the use of commonly used specialized instruments. But if there are lenses with the same degree but opposite nearsightedness or farsightedness at hand, the neutralization method can be used to observe (overlap a known degree farsightedness lens with an unknown degree nearsightedness lens and then observe distant objects). If it happens to neutralize, then the degree of this lens is known.

The detection optical center can be measured using a simple cross method. Firstly, draw a large "ten" on white paper and place the lens on top of it. If the stroke is curved, it indicates uneven optical density of the lens.

Move the lens to connect the "cross" strokes inside and outside the lens into a complete "cross" shape. Make a mark at the center of the "cross" on the lens, the optical center point. After measuring the optical centers on both sides of the lens, observe and compare whether the optical centers on both sides are symmetrical, without any high or low phenomenon.

Due to the wide variety of glasses on eyeglass mart significant differences in craftsmanship and prices, some use precious metals or are embedded with gemstones. The quality of glasses depends on the lenses, while the price depends on the frame, so the price cannot reflect the quality of the glasses. Therefore, the quality of glasses cannot be judged by price.