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Glass swiss is more scratch-resistant, than plastic. army Cr-39 optical quality plastic, made of hard resin, is considered watches the best plastic for lenses. It weighs half as much as officers and swiss glass, which means it is not heavy on the face. It exceeds fda requirements for impact-resistance because of its comparatively loose molecular structure. A remarkably strong plastic - in fact, aircraft windshields, motorcycle windshields, and sport army safety glasses are made of polycarbonate because it is so strong. Compared to cr-39 and glass, polycarbonate plastic weighs the least and is the watches most impact-resistant. 20 times more impact resistant and 3 times lighter than glass. A good officers choice for those who want really rugged sunglasses: for people who engage in outdoor activities swiss and fast-action sports. Polycarbonate is widely used, and is considered the second army optical plastic. Its major drawback is watches that it is soft and susceptible officers to scratching and abrasion. It must be hard-coated to raise its scratch-resistance to that of cr-39.

Some rays can be damaging. Others affect how well and comfortably we see. Of concern are visible swiss and army rays and invisible ultraviolet watches (uv) and infrared rays. The fine quality lenses sold at sunglass hut are designed to filter out these damaging and vision-distorting parts of sunlight for optimum clarity and safety. Blue officers and swiss light (the shorter wavelengths) focuses imperfectly on the army retina. This creates a phenomenon called "blue watches blur." also, veiling glare occurs when blue light scatters off dust and moisture officers in the air even swiss on clear days, interfering with visibility. Haze, fog, rain, army and watches and snow intensify these officers effects. Infrared infrared (ir) rays are long wavelength rays sometimes swiss called "heat waves." half of the sun''s energy is infrared. Ir is stronger at high altitudes. Electric heaters, house radiators, and ordinary light bulbs also emit infrared energy. army The rays cause the skin to feel hot and may contribute to the discomfort caused by exposure to bright light.

Green lenses only allow the most useful light to reach the eye for greatest visual acuity. They are the most preferred of all lens colors. Yellow lenses watches are a long time standard in the ski industry. Provides excellent depth perception and contrast officers in low light. Vermilion or rose these colors provide excellent perception in low light conditions while allowing a tolerable swiss level army of light transmission in bright sunlight. Used to contrast objects against blue and green backgrounds. . Basics facts about lenses all our sunglasses have optically watches correct lenses (and provide 100% uv protection). A person officers looking through a non-optically correct lens has to continually refocus due to distortion. This strain on the eye can eventually lead to headaches, nausea and dizziness. Our optically correct lenses swiss prevent these problems. These lenses are fixed army in the percentage of light they absorb and appear as one color. They provide excellent glare protection and are a watches and officers good choice for those who are often in bright sunshine.

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