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A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
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Eyebuydirect is an online-only retailer and designs and custom-makes most of its glasses in-house. [13] [19] They carry primarily affordable eyeglasses, but also offer three premium brands. [13] [20] Ray-Ban, Oakley, ARNETTE and Vogue Eyewear are their outside premium brand offerings, while RFLKT is their in house premium brand. According to ...
The American Academy of Ophthalmology (AAO) does not recommend special eyewear for computer use, [13] [14] although it recommends using prescription glasses measured specifically for computer screen distance (depending on individuals, but possibly 20–26 inches from the face), which are not the same as "blue-light blocking" glasses. [21]
With prices starting at $60 per frame, prescription lenses included, Pair is already pretty affordable. However, for a limited time, Yahoo Life readers can save 15 percent on any Pair Eyewear ...
Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...
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