Dilute solutions of silver nitrate and other silver compounds are used as disinfectants and microbiocides ( oligodynamic effect), added to bandages, wound-dressings, catheters, and other medical instruments. Its compounds are used in photographic and X-ray film. Other than in currency and as an investment medium ( coins and bullion), silver is used in solar panels, water filtration, jewellery, ornaments, high-value tableware and utensils (hence the term " silverware"), in electrical contacts and conductors, in specialized mirrors, window coatings, in catalysis of chemical reactions, as a colorant in stained glass, and in specialized confectionery. As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Its purity is typically measured on a per-mille basis a 94%-pure alloy is described as "0.940 fine".
Silver metal is used in many bullion coins, sometimes alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Silver has long been valued as a precious metal. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.
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The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Free Shipping and Easy returns.Silver is a chemical element with the symbol Ag (from the Latin argentum, derived from the Proto-Indo-European h₂erǵ: "shiny" or "white") and atomic number 47. Call or chat one of our knowledgeable Sunberry RX opticians if you have any questions about ordering Gascan prescription sunglasses. Need Prescription lenses? Choose from any of the Oakley RX lenses which feature Polarization, Prizm, Iridium and Transition. These frame are perfect for those who seek wrap around protection along with everyday style. The Gascans offer a three-point-fit to ensure that your frames stay in place at all times. The frames are made of the Oakley O matter material which enables long lasting durability with a lightweight feel. This enables greater peripheral vision from all angles. The Gascan lenses are cut from the curve of one large lens. The Gascan frames have shield lenses which are lenses that are on a curve and wrap around the face. These frames offer a superior visual clarity from all angles and views. The Oakley Gascan frames are one of the most popular and Oakley models. The toric lens design became known as Gascan® and it spawned an aesthetic so new and original, we customized our corporate logo for the frame. We traded soft curves for straight edges and hard lines to sculpt our very first high-wrap lifestyle shades. Inspired by the street glory of speed machines, Oakley® design language did a complete 180 in 2005. This is a placeholder for the number zero.Ī component a doctor may add to a prescription for people with double-vision or certain special types of eyestrain
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If the PD number is missing from your prescription, find out how to measure it here The distance between your right pupil and your left pupil in millimeters (mm). X 180 means AXIS 1800 It describes the angle in desgrees where your astigmatism power is. Near-vision prescription for up-close vision.
Sometimes SPH or sph is written as a place-holder in your prescription in the CYL column. Not bifocals, and not progressives ("no-lines")
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It will have either a minus (-) sign or plus (+) sign in front of it.ĭistance-vision-only. Indicates whether correction is needed for distance vision r for near visionĬYLINDER power.
How much power gets added to the distance foryour reading-only Rx
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