Use classification of sunglasses
Sun mirror, light-colored sunglasses, and special purpose sunglasses three types of sunglasses can be divided into general use.
The so-called sun mirror, suggests that it is for shading purposes, people usually rely on in the sun to adjust the size of the pupil to adjust the flux when the light intensity more than the human eye to adjust, it will cause harm to the human eye. Outdoor activities, especially in the summer, many people are using sun mirror to block the sun in order to reduce eye adjustment caused by fatigue or light to stimulate the damage.
Light-colored sunglasses to block the sunlight role not as good as the sun mirror, but its rich colors, suitable for use with all types of clothing, there is a strong decorative effect. Light-colored sunglasses because of its rich colors and varied style, by the young people of all ages, fashionable women of their more fallen in love with. Special-purpose sunglasses block the sunlight functions, commonly used in the sunlight is more intense field of the beach, skiing, hiking, golf, and have high requirements for its UV resistance performance indicators.
Different groups of people, according to different preferences and different uses to select the sunglasses, but the most fundamental from the protect the safety and vision of the wearer does not damage the basic principles. Reduce light stimulation, visual clarity without distortion, anti-UV, color recognition distortion, accurate identification of the traffic signal should be a basic function of sunglasses. If there are defects in these functions, ranging from loss of the role of the sunglasses, weight will produce consciously meet the symptoms of dizziness, eye soreness, and sometimes produce unresponsive inequality debate color illusion and walk visual symptoms and lead to accidents and so on. So sunglasses can not just focus on style and ignore its inherent quality.
The classification of lenses that
The types of lenses that are broadly divided into: five kinds of anti-reflective protective lenses, color lenses, color coated lenses, polarized lenses and photochromic lenses.
Anti-reflective protective lens: This lens is coated with a thin layer of magnesium fluoride, to prevent light reflection, so you see things more clear and free from light interference. To test your sun glasses is really an anti-reflective protective lenses, glasses against the light, if you see a purple can be green reflective, it is indeed coated with anti-reflective protective film on the lens.
Color lenses: Also called a "stain lens is the lens production process, coupled with some chemical substances, so that the lens showing color to absorb specific wavelengths of light. This is the sunglasses the most commonly used type of lens.
Coloring lens: This lens showing the effect of the same color lens, made only in different ways, it is the color applied to the lens surface, the most well-known gradient coloring lenses, color is above the deepest , and then down gradually shallow. General degree of sun glasses is a multi-coloring approach to the lens.
Polarized lenses: In order to filter the sun shines a dazzling light in equal direction of the water, land or snow, to join the vertical to the special coating on the lenses, known as polarized lenses. Most suitable for outdoor sports (such as: maritime activities, skiing or fishing) use.
Lenses: It was also known as the "light-sensitive lens. To join the silver halide chemicals on the lenses, so that the originally transparent and colorless lens case of strong light, it will become colored lenses do protection, and so is suitable for indoor and outdoor use.
Color of the lens types and characteristics of each
1) gray film: Grey lenses for any chromatography can be balanced absorption, so watch the scene will darken, but there will be obvious color, to show the true nature feel. Are neutral colors.
2) tinted lenses: to filter out a large number of Blu-ray, can improve the visual contrast and clarity, in the case of air pollution severely punished or foggy wear better. Generally be able to block the reflection of light, smooth and shining surface of wearing glasses can still see the subtle part is the ideal choice for the driver.
3) The green lens: the absorption of light at the same time, maximize the green light to reach the eye, so very cool and comfortable feeling, suitable for eye fatigue.
4) Blue-gray lenses: gray lenses, lens with a neutral, but darker and visible light absorption rate higher.
5) mercury lens: the lens surface with a high density of the mirror coating. This lens is more absorbed into the reflection of visible light, suitable for outdoor sports people.
6) yellow lenses: Strictly speaking, such a lens does not belong to sunglasses, because it almost does not reduce visible light, but in the foggy dusk, the yellow lens can improve contrast, provide more accurate video, also known as the Night rearview mirror. Part of young people wearing yellow lenses sunglasses for use as a decoration.
7) light blue, pale pink lenses: the same is more decorative than practical lens.
8) dark green lens: to absorb the heat, bring the cool feeling, but the low light transmission and clarity, suitable to wear when the sun while driving, not wearing.
9) blue lenses: the sandy beach to play can wear blue lenses, blue can effectively filter out the reflection of the light blue of sea and sky. The car should avoid using the blue lens, because it makes us confusion of the colors of traffic signals.
