Is there a lens to correct protanopia color defect?

Caution. The use of a red contact lens or purple tinted glasses will allow you to distinguish the letters and numbers on test plates that you get wrong with the naked eye. However they work by shifting the axis of color deficiency so you become color blind in a new way and they cut down the overall light intensity which decreases acuity and contrast sensitivity. These are not cures.
No definitive cure… But one site offered management suggestions:, certain types of tinted filters & contact lenses may help an individual better distinguish different colors. Optometrists can supply a singular red-tint contact lens to wear on the non-dominant eye. Software & cybernetic devices have been developed (eyeborg) a device that allows colorblind to hear sounds representing colors. Google eyeborg.