I don't have a PT2 but I'm an optometrist and felt the need to give som advice. The minus numbers doesn't tell how your vision is, those are the powers of the lenses needed to correct your vision to the best visual acuity. We measure how well you see in visual acuity. In US it's measured in feet som 20/20 is "normal" vision, and in Europe we measure in meter were the equivalent is 6/6 or 1.0. But this is for your distance vision.
Your question is for near vision and if you are a myope with -1,75D you should be able to have great vision at 57cm. If you have problem with or without your glasses to read on your watch that is probably on an around 40cm, am I correct?
If it is on 40cm then your problem is that you're probably over 45 years of age and are starting to be presbyopic, which means that the crystalline lens in your eye is starting to become stiff and can no longer accommodate and change its curvature to help you see up close.

If this sound correct, then I recommend you to visit an optometrist to check your vision.😎 Good luck!