How to identify the quality of glasses

China has 200 million people wear glasses, of which 70% or more of myopia, wearing glasses who lives a few glasses to consume, no refractive errors also need to wear reading glasses, sunglasses, glasses, so China is a big country. Direct impact on the quality of glasses health of the masses, have some simple methods of identification, for maintaining their own health.

    First, the purchase of glasses to observe the lens surface is smooth, without scratches, streaks, bubbles and particles, lens color, texture, transparency is uniform, with or without Huo Guang (Huo Guang was due to uneven density or glass lenses produce internal stress due) replica gucci belts, holding the lens placed in front of 25 cm observation of distant scenery, if scenery clear, no distortion, moving slowly up and down the scene without beating, that lens transparency and good uniformity of light. If Huo Guang, beating or deformation visible scene.

    Determination of refraction and optical center: lens refraction, eye can not accurately measure can only be estimated, which require special instruments to measure. However, if the hand has the same degree, the opposite of myopia or hyperopia in the lens and can be used to observe the (degree of hyperopia with known and unknown degree of myopia lens lenses stacked, and then observe the distant scenery), and if just in, this lenses are known degree of the lens. Optical center of the cross method can be easily measured. First draw a large white cross, who cross the intersection in front of the lens placed 10-20 cm from the lens observed in the cross shape, if the cross strokes curved lenses, then uneven lens optical density. Move the lens to the lens and the lens inside the cross outside the strokes together into a complete cross, cross at the center of the lens to make a mark, this point is the optical center, are measured on both sides of the lens optical center, observation and comparison of bilateral optical center is symmetrical, with no one high and one low phenomenon, with a ruler Measure the distance between two optical centers is consistent with interpupillary distance, pupil distance and two from the optical center of the error should not exceed 2 mm.

    Frames to observe the connection is solid mens gucci belts, loose, open legs, when the mirror symmetry, is balanced on the table, the various parts of the face should be wearing glasses, the first type of line, especially the ear part of the mirror hanging by the legs each case will be trimmed to wear comfortable appropriate.

    In addition, because many types of glasses, very different process, the price disparity, some embedded with the use of precious metals or precious stones, expensive, but as the role of vision correction is not meaningful. Glasses depends on the quality of the lens, and the price depends on the frame, so the price does not reflect the level of optical quality. Therefore, the price can not be judged good or bad quality of glasses.

Location:	Aland Islands, asdsad
Address:	How to identify the quality of glasses
Date, time	Apr 19 2012 at 07:16am
End date	Apr 19 2012 at 10:13am