What is my eye power if i have a -1.75?

Question

like in a 20/20 format

Answer 1

Your prescription cannot determine your vision level nor vice versa.

Answer 2

Any guess is just a guess.

There is no way to know what the 20/20 value is from seeing the prescription.

You most likely see 20/20 with the correction , but without a correction , it is impossible to tell.

That would be in the Dr.s records who did the exam.

Answer 3

probably around 20/80 or 20/100.  

i saw "footprints" response and so wanted to explain my answer.  Each line on the chart is approximately -0.25D of a prescription.  since your prescription is -1.75D that is 7x0.25.  So if you count up 8 lines from the 20/20 line it brings you to 20/80 or 20/100.  This is an approximation and if you have any astigmatism or other factors affecting your vision, it could be worse then that.  and yes, your optometrist record would give you the most correct answer to your question.