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What does Plano mean on an eyeglass prescription? Well, if only one of our eyes requires correction, we may be given a pair of glasses that has only one corrective lens for the affected eye, and a plano lens for the healthy eye. ... They all mean the same thing: the lens has no corrective power. If your prescription has the word Plano, PI, or an infinity sign, it means that you do not have distance problems. You may, however, have astigmatism. Most values will be 0.00 to +/-20.00. Axis. Axis is the lens meridian that has no cylinder power to correct astigmatism.