What does sphere 75 cylinder -3.00 axis 164 mean?

This prescription indicates a spherical power of -0.75, a cylindrical power of -3.00, and an axis of 164 degrees. It is a prescription for correcting astigmatism, a condition where the eye has difficulty focusing clearly due to an irregularly shaped cornea. The spherical power corrects for nearsightedness or farsightedness, while the cylindrical power and axis correct for the astigmatism.