An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
Loading the player...Measuring Your Prescription David Mitchell, OD, discusses Measuring Your Prescription
Well the phoropter is the instrument that the optometrist uses on every patient every single day. It contains all the lenses that are used to calculate what someone's prescription might be. This lens we use to control the nearsightedness and farsightedness that might be in the prescription.
This auxiliary dial is used to look for the astigmatism that might be in the prescription. And if we check for the coordination of the eyes and the muscle balances, and it will generally take about 10 minutes to do. Presenter: Dr. David Mitchell, Optometrist, Vancouver, BC