Ophthalmic Technician

Answer: B - 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.