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A myodisc or myopic disk is a corrective lens with a steep concave curvature that is fitted on the posterior surface of a carrier lens, or a high power single-vision lens specially ordered with slab-off the edge, creating a central prescription disc. These are used for correction of extremely high myopia often seen in low vision patients. [1]
Mid-index: 1.54 ≤ n d < 1.60; High-index: 1.60 ≤ n d < 1.74; Very high index: 1.76 ≤ n d; This is a general classification. Often for marketing purposes, materials with n d values that are at or above 1.60 can be referred to as "high-index". Likewise, Trivex and other borderline normal / mid-index materials may be referred to as mid-index.
MgF 2 coatings perform much better on higher-index glasses, especially those with index of refraction close to 1.9. MgF 2 coatings are commonly used because they are cheap and durable. When the coatings are designed for a wavelength in the middle of the visible band , they give reasonably good anti-reflection over the entire band.
Reading glasses are available without prescription from drugstores, and offer a cheap, practical solution, though these have a pair of simple lenses of equal power, and so will not correct refraction problems like astigmatism or refractive or prismatic variations between the left and right eye. For the total correction of the individual's sight ...
The chain offers optometry and optician services for eyesight testing and sells glasses, sunglasses, and contact lenses. It also sells hearing aids . In the United Kingdom in 2012, it had the largest single market share of the four major opticians , with 42% of the market.
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