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An eyeglass prescriptionhttp://www.shareasale.com/u.cfm?d=370830&m=58880&u=1408798 is an order written by an eye glasses prescriber, such as an optometrist or ophthalmologist. It specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses.
If an examination indicates that corrective lenses are appropriate. The prescriber generally provides the patient with an eye glasses prescription at the conclusion of the exam.
In the United States. The Federal Trade Commission requires eye glasses prescribers give each patient a copy of their prescription following an exam.
The parameters specified on spectacle prescriptions vary but typically include the power to which each lens should be made. This is done to correct blurred vision due to refractive errors, including myopia, hyperopia, astigmatism, and presbyopia.
It is typically determined using a phoropter and asking the patient which of two lenses is better. Or by computer automated refractor, or through the technique of retinoscopy.
A dispensing optician will take a prescription written by an optometrist or ophthalmologist. They then order and/or assemble the frames and lenses to then be dispensed and sold to the patient.