Special sunglasses

1, the polarized lenses - - Polarized lens is composed of seven layers chip, and the overall structure of precision is unique, after the test, can filter out 99% of harmful ultra-violet rays and shatter-proof, wear special functions. Role: usually, the sun is shining in all directions, when shot into the object, light reflection redirected, formation of horizontal and vertical two types of reflected light, the former is the cause of the reflected light, this is the line of sight of useless polarization. Polarized lens has a special type of filtration material, can filter for water, moisture or reflection of sunlight roads and wet sand. Outside synthesized from seven sheet: two layers is hard wear-resisting layer, the second, six is shatterproof strengthening layer; The third and fifth layer is uv filters; The middle layer is polarized filter layer. Identify a pair of glasses is polaroid: method 1: use test piece, provided by the manufacturer through the polarized light can filter noise and see at ordinary times can't see the images. Method 2: a pair of known polarizer and another pair of lenses that level of overlap of the unknown, and then rotate polarized lenses, found two pieces of lens shading result from shallow to deep, means that the second polarizer. Note: the polarized lenses, not with ultrasonic cleaning.
2, color lenses - - Lenses containing silver bromide and iodide. Light, the light energy to make the lens of the silver halide decomposition of silver and halogen atoms, the lens color is darker, the shading rate can reach 50%, when the sun disappears, the silver and halogen atoms are combined with state of the lens, lens color becomes shallow, shading rate was 15%. Color glasses also affected by temperature, at high temperature in shallow color, darker in cold weather. Due to join the silver halide and copper oxide have been combined with optical glass, so the color glasses to repeatedly change color, use for a long time, can protect the eyes from strong light stimulation, but also have the effect of vision correction. Color changing lens is mainly used in the open, snow, indoor light source, the workplace, to prevent sunlight, ultraviolet light, dazzling glow to eye damage. Can be divided into: film base color: color changing fast ( About 5 - 10 seconds) , fade quickly ( About 10 minutes) , uniform color effect, long service life; But some difference lens with the thickness of the lens base and uneven color, color. Film color ( All the line of sight) : fast color change ( About 5 - 10 seconds) , fade quickly ( About 10 minutes) To the above advantages, won't produce according to the thickness uneven discoloration; But if discoloration membrane is damaged, it will affect the effect. Color factors: ultraviolet intensity: the stronger the intensity of ultraviolet ray, fast color, color depth; Uv intensity weaker, discoloration speed slow, shallow color. 2, light intensity, the longer the light, color changing fast, concentration ( Outdoor, plateau, snow) 3, temperature, the higher the temperature, color is more shallow, Molecular activity) 。 4, the thickness of the lens: the lens is thicker, the deeper the color concentration ( Impact on the speed without) 。 Note: 1, change single, often appear inconsistent color, suggest customer two pieces of change at the same time. 2, due to fade slowly, often in and out of the indoor and outdoor customer, it is suggested that don't deserve, Students should not be)
3, due to the thickness of the lens is different, different color concentration, if the customer two eye diopter difference between 2. 00 d above, it is suggested that don't match. 4, high myopia eyes feel more black, the other edge and center color difference is big, not beautiful. 5, convex mirror center color changing effect is low, not match color lenses.
3。 Dyeing lenses - - Dyeing - lens type and function - 1, gray: gray lenses can absorb any balance chromatography. Therefore, wearing grey glasses to watch scenery, scenery a little darker, but do not have clear off color, feel to see things more real and natural. 2, dark brown, dark brown lens can filter out a lot of blue light, can improve visual contrast and clarity, usually in a foggy weather and pollution environment wearing effect is good. 3, green: green lenses absorb light, on the one hand, on the other hand eye big limit increase to reach the green light. So, people wear green spectacles, will feel cool, comfortable, rise to alleviate eye fatigue, is suitable for the people to use the eye fatigue. 4, pale blue, blue grey lens and grey lens effect are similar, both belong to the neutral glasses, but the color is more deep than gray, absorb more visible light 5 in the sun, mercury piece: mercury lens lens surface using high density mirror coating. This lens can be a lot of absorption of incident light and the incident light reflection, suitable for outdoor, beach, snow sports wear. 6, yellow: yellow lenses, strictly speaking, do not belong to the category of the sun glasses. Because yellow lenses almost do not absorb visible light, but its advantage is that foggy environment or the evening sky, yellow lenses can improve contrast, provide more accurate video, so also known as the night vision goggles. Suitable for motorists. 7, decorative parts: light blue, light pink and other dyeing lenses, due to the characteristics of dyeing material, don't absorb the visible and ultraviolet light in sunlight. Therefore, the role of these lenses is higher than that of practicality, decorative is suitable for the pursuit of fashionable gens.