The correction is typically slightly lower than for glasses, but besides the corrections (sphere, cylinder and axis), lenses also have curve (BC) and diameter (DIA) to fit your eye.
If you have an old box of lenses you can usually find all the numbers printed on the side.
I only use lenses occasionally, so when I recently ordered lenses online using the info from an old box and correcting for the change in my glasses since I had the old lenses, I could sort of figure it out, but they are probably still off by 0.5 or so.
I think you’re better off seeing an optometrist than guessing.
Optometrist for a new prescription. Not for new glasses. Get your glasses through any of the various cheap online retailers Zenni, lensdirect, etc. Contacts are harder to find for cheap and most will ask for a more up to date prescription to fill.
The correction is typically slightly lower than for glasses, but besides the corrections (sphere, cylinder and axis), lenses also have curve (BC) and diameter (DIA) to fit your eye.
If you have an old box of lenses you can usually find all the numbers printed on the side.
I only use lenses occasionally, so when I recently ordered lenses online using the info from an old box and correcting for the change in my glasses since I had the old lenses, I could sort of figure it out, but they are probably still off by 0.5 or so.
I think you’re better off seeing an optometrist than guessing.
I think I’m better at asking my neighbor for his old glasses which I can see crystal clear through than trying to piss $300 through a $30 bladder.
Optometrist for a new prescription. Not for new glasses. Get your glasses through any of the various cheap online retailers Zenni, lensdirect, etc. Contacts are harder to find for cheap and most will ask for a more up to date prescription to fill.
Costco does exams for $60.
My preferred optometrist has a 3 month waiting list. And the nearest Costco is 42 miles away from me.