There are generally three variables printed on a contact lens box. What does the marking "(P)" stand for?

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Power
The marking "(P)" on a contact lens box stands for power. It is typically accompanied by "(BC)" and "(DIA)," which stand for base curvature and diameter, respectively. The power of a contact lens is not always the same as the patient's spectacle correction.With powers greater than 4 diopters, this differencebetween spectacle and contact lenspowers becomes significant enough to consider. Once the analogous contact lens is determined, a trial lens can be worn by the patient and the power refined even further with an over-refraction.

There Are Generally Three Variables Printed on a Contact Lens