There are two main culprits of Computer Vision Syndrome and Digital Eye Strain: prolonged exposure to blue light and glare. Blue light is high energy light that digital devices and LED lights emit. Blue light sits at the end of the visible light spectrum, right next to UV light. Its short wavelength, which is inversely correlated to energy level (meaning the shorter the wavelength, the higher the energy), enables that high energy to enter and stress the ciliary muscle in the eye, thus leading to Computer Vision Syndrome and Digital Eye Strain. Blue light’s nickname is HEV light (high-energy visible light) for a reason!
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For the Traveler Modern Optical Disrupt Aging Buy Now: 10 Best Stylish Glasses It is also sometimes claimed that glasses were first invented in India. In 1907 Professor Berthold Laufer stated in his history of glasses that "the opinion that spectacles originated in India is of the greatest probability and that spectacles must have been known in India earlier than in Europe". However, Joseph Needham showed that the mention of glasses in the manuscript Laufer used to justify the prior invention of them in Asia did not exist in older versions of that manuscript, and the reference to them in later versions was added during the Ming dynasty. In a 1971 article in the British Journal of Ophthalmology it was argued that it: "...is therefore most likely that the use of lenses reached Europe via the Arabs, as did Hindu mathematics and the ophthalmological works of the ancient Hindu surgeon Susruta", but all dates given are well after the existence of eyeglasses in Italy was established, and there had been significant shipments of eye glasses from Italy to the Middle East, with one shipment as large as 24,000 glasses.
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If you own a pair of glasses frames that just need to have the lenses replaced, we can help you. Having to replace an entire pair of glasses or sunglasses because of a broken, cracked, or scratched lens is expensive when you consider the price of new frames with the cost of new lenses. If you have a pair of perfectly good frames, pair of favorite frames, or have just bought a pair of vintage frames and need only new lenses, save some money by getting replacement lenses. There are a few steps that need to be followed when buying replacement lenses.
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GMG Series Request an Exam $119.00 Eyeglasses frames have four basic measurements: the eye, bridge, temple, and B measurements. The eye size refers to the horizontal width in millimeters of one of the frames lenses. The measurement is taken from the inside of one side of the frame to the inside of the other side of the frame. The lens is measured from its furthest point, where it would intersect with a vertical line. The bridge measurement is the distance in millimeters between the two lenses. It is measured between the two closest points of the two lenses. The temple length is measured along the length of the temple, from one end to the other, including the bend. Many frames are constructed with an endpiece that extends from the frame front back along the line of the temple. This backward extension of the frames endpiece could be as little as 2mm, or as much as 15mm. When the endpiece extends further back, the temple length tends to be smaller to compensate. As a result, if you are accustomed to a 145mm temple length, a 135mm temple could work perfectly for you if your new frame has an endpiece that extends back 10mm. This is also the case with many sunglasses with a wrap design. The wrap has the effect of bringing the frame front back towards the ears, thereby requiring shorter temples lengths to compensate. The B measurement refers to the vertical height of an eyeglasses lens, and is measured from the tip to the bottom of the lens aperture of the frame. The measurements are taken from a horizontal line intersecting with the top of the lens, to the horizontal line intersecting with the bottom edge of the lens. The B measurement is only important when making progressive or multifocal lenses.
Read more: 8 ways to get better dental care when you’re living on a fixed income SUVs Different eyes call for different eyeglass prescriptions, and for either single-vision lenses or multi-focal lenses, which includes bi-focals, tri-focals, and progressive eyeglass lenses.
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Also see: How to Measure Pupillary Distance or PD, What's My Glasses Frame Size?, Lens Color Guide, Understanding Your Prescription, Need to Order Lenses Only?
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Óticas Carol Riding bow temples: curve around the ear and extend down to the level of the ear lobe. Used mostly on athletic, children’s, and industrial safety frames;
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