I always had regular annual test with the same opticians. They've always said my prescription is stable.
I got a free voucher for an eye test with different location and got drastically different results.
Result for original opticians from 3 months ago:
Sph, Cyl, Axis
-0.75, -1.75, 10.0
-0.25, -2.00, 175.0
-2.50, 1.50, 90.0
-1.75, 1.50, 90.0
I didn't bring my original prescription to new opticians, so I didn't notice the difference until I got to home and compared the numbers.
Question: Should I worry? My vision hasn't gotten worse and I still see well with old pair of glasses as always.