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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.
Plastic lenses are currently the most commonly prescribed lens, owing to their relative safety, low cost, ease of production, and high optical quality. The main drawbacks of many types of plastic lenses are the ease by which a lens can be scratched, and the limitations and costs of producing higher-index lenses.
The gradient starts at the wearer's distance prescription at the top of the lens and reaches a maximum addition power, or the full reading addition, at the bottom of the lens. The length of the progressive power gradient on the lens surface depends on the design of the lens, with a final addition power between 0.75 and 3.50 dioptres.
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Consumers can purchase frames, prescription eyeglasses, prescription or plain sunglasses, and contact lens refills. [9] After choosing the desired frames, the consumer goes through a three-step process to order lenses including choosing the lens type, lens thickness, and optional enhancement features. [ 11 ]
LensCrafters is an international retailer of prescription eyewear and prescription sunglasses. Its stores usually host independent optometrists on-site or in an adjacent store. The company has its corporate headquarters in Mason, Ohio , a suburb of Cincinnati in the US.
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