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Typical values for a contact lens are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the lens that the prescription describes (the lower the number, the steeper the curve of the cornea and the lens, the higher the number, the flatter the curve of the cornea and the lens).
The equivalent prescription at the patient's cornea (say, for a contact lens) can be calculated as follows (this example assumes a negative cylinder sign convention): Power 1 is the spherical value, and power 2 is the steeper power of the astigmatic axis:
Contact lens wearers can also wear sunglasses, goggles, or other eye wear of their choice without having to fit them with prescription lenses or worry about compatibility with glasses. Additionally, there are conditions such as keratoconus and aniseikonia that are typically corrected better with contact lenses than with glasses.
The owner of a website that sold cosmetic contact lenses to consumers without prescriptions reached a settlement with the Federal Trade Commission to stop the practice. Da Young Kim and her Duluth ...
Some prescription drug (Part D) plans charge a $0 yearly deductible, but this amount can vary depending on the provider, your location, and more. Medicare Part D catastrophic coverage: What to know
The Act gives consumers certain rights, including increasing their ability to choose where to shop and the right to have a copy of their own contact lens prescription.It also imposed certain responsibilities on lens prescribers and sellers, and required the Federal Trade Commission to develop and enforce implementing rules, which it did in July 2004.
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