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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.
Prescription drug list prices in the United States continually are among the highest in the world. [1] [2] The high cost of prescription drugs became a major topic of discussion in the 21st century, leading up to the American health care reform debate of 2009, and received renewed attention in 2015.
Medication costs can be the selling price from the manufacturer, that price together with shipping, the wholesale price, the retail price, and the dispensed price. [3]The dispensed price or prescription cost is defined as a cost which the patient has to pay to get medicines or treatments which are written as directions on prescription by a prescribers. [4]
A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím , who also invented the first gel used for their production.
A skilled frame stylist will help the wearer select a good balance of fashionable frame size with good vertex distance to achieve ideal aesthetics and field of view. The average vertex distance in a pair of glasses is 12-14mm. A contact lens is placed directly on the eye and thus has a vertex distance of zero.
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. [8]