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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:
ScripTalk consists of three main components: an Audible Prescription Reading Device (APRD) or ScripTalk Station Reader, radio-frequency identification (RFID) microchip label and supporting software. [18] [19] RFID microchip is encoded with the prescription data by the pharmacist and affixed to the bottom of the prescription bottle or package. [18]
The prescription consists of all the specifications necessary to make the lens. Prescriptions typically include the power specifications of each lens (for each eye). Strengths are generally prescribed in quarter-diopter steps (0.25 D), because most people cannot generally distinguish between smaller increments (e.g., eighth-diopter steps / 0. ...
Correction of presbyopia (a need for a reading prescription different from the prescription needed for distance) presents an additional challenge in the fitting of contact lenses. Two main strategies exist: multifocal lenses and monovision.
An online version is available, with all drug listings available to view for free. Concise drug monographs form the core of MIMS; these include safety information, details of the active ingredient, presentation, price, indication, dosage and manufacturer. In addition, the book includes drug comparison tables, and summaries of clinical guidance.
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