A patient complains of reduced vision after a well-fitted rigid lens has been polished by the fitter. The fitter should:

In this scenario, when a patient experiences reduced vision after a rigid lens has been polished, the first step a fitter should take is to check the quality of all lens parameters. This diagnostic approach is crucial because it helps in identifying any potential discrepancies or issues that may have arisen during the polishing process or throughout the lens wear.

By thoroughly checking parameters such as the base curve, power, and thickness, the fitter can ascertain whether the lens is still correct according to the patient's prescription and fit. Any deviation in these parameters could contribute to a decline in visual acuity, and addressing these aspects may resolve the patient's concerns more effectively than repolishing, re-edging, or altering the lens diameter. Ensuring the parameters are within specifications lays the groundwork for any needed adjustments to improve vision quality.

This comprehensive assessment is a key step in the troubleshooting process, allowing the fitter to make informed decisions about potential corrective actions based on the findings.