3 ms·
Just add diopters to the SPH (sphere) portion of your prescription, there is a formula 1/diopters to get your desired focal plane: +1 for 1 meter away, +1.25 fo
by ivank 6y ago
Just add diopters to the SPH (sphere) portion of your prescription, there is a formula 1/diopters to get your desired focal plane: +1 for 1 meter away, +1.25 for 0.8 meters, etc