R-575-150 * 20l-525-350 *165pd661glasses. What does this mean?

R-5.75-1.50 * 20l-5.25-3.50 *165-refractive correction degree, such as 575 degree myopia in the right eye/150 degree myopia astigmatism-axial position 20.

PD66- Pupil distance.

1.6 1- refractive index of the lens.