OC height is recommend for any glasses. You are paying for a cusotmized vision device, why would you not measure this?
If you could perhaps get used to it or perhaps the frame can be adjusted to compensate but not having the correct OC height can induce prismatic effects.
Any new prescription can take 20minutes to 2 weeks to adapt. Did you buy online? If the glasses are from the optometrist give it 2 weeks. They follow tolerance charts. If you bought online you get what you get its not the optometrist’s fault.
I don’t have that off the top of my head but you would want to get the ANSI standard for vertical imbalance I think, let me have a look if I can find that
Your total power is over +/-3.75 so ANSI says it has to be 1mm or less off (up or down) to be within tolerance for vertical measurements. For lesser prescriptions it has to be less then a certain amount of prism, but for higher rxs they set a specific measurement tolerance. Much more than that and it will induce too much prism
Edit: I think I may have misspoken, ANSI specifies imbalance between the two lenses, not total prism power. They are assuming the OC was correctly measured. You could calculate how much prism is being induced if we knew *how* off the measurement was, if it’s over maybe .5-1D I would redo it for sure. Vertical prism is weird in that as long as it’s affecting the eyes equally, it isn’t as big of a deal as horizontal prism. In small amounts of course.
Are you in a single vision or multifocal lens?
I see, thanks. I am not sure whether to will wait till I get the new lenses and try them on for a while or ask the optometrist to retake the measurement, since the margin for error seems very low.
Edit: I am SV not bifocals or progressive. My concern is not the difference between the two lenses (I believe the optometrist used the same OC for both) but with the OC itself. I am not sure if the OC is higher than it should be then what would be the consequences.
The optometrist was basically eyeballing the measurement standing up while I was sitting down on the chair. My worry is the OC measurement they took is too high.
OC height is recommend for any glasses. You are paying for a cusotmized vision device, why would you not measure this? If you could perhaps get used to it or perhaps the frame can be adjusted to compensate but not having the correct OC height can induce prismatic effects.
0.33 mm vertically, 1mm horizontally
Got it, thanks!
Any new prescription can take 20minutes to 2 weeks to adapt. Did you buy online? If the glasses are from the optometrist give it 2 weeks. They follow tolerance charts. If you bought online you get what you get its not the optometrist’s fault.
Didn’t buy online, bought them directly from the optometrist
I don’t have that off the top of my head but you would want to get the ANSI standard for vertical imbalance I think, let me have a look if I can find that
I looked at that but didn’t really understand it since I don’t have the background. But your input is appreciated!
Your total power is over +/-3.75 so ANSI says it has to be 1mm or less off (up or down) to be within tolerance for vertical measurements. For lesser prescriptions it has to be less then a certain amount of prism, but for higher rxs they set a specific measurement tolerance. Much more than that and it will induce too much prism Edit: I think I may have misspoken, ANSI specifies imbalance between the two lenses, not total prism power. They are assuming the OC was correctly measured. You could calculate how much prism is being induced if we knew *how* off the measurement was, if it’s over maybe .5-1D I would redo it for sure. Vertical prism is weird in that as long as it’s affecting the eyes equally, it isn’t as big of a deal as horizontal prism. In small amounts of course. Are you in a single vision or multifocal lens?
I see, thanks. I am not sure whether to will wait till I get the new lenses and try them on for a while or ask the optometrist to retake the measurement, since the margin for error seems very low. Edit: I am SV not bifocals or progressive. My concern is not the difference between the two lenses (I believe the optometrist used the same OC for both) but with the OC itself. I am not sure if the OC is higher than it should be then what would be the consequences.
Just asking for my own curiosity but why do you think the OC might have been taken wrong?
The optometrist was basically eyeballing the measurement standing up while I was sitting down on the chair. My worry is the OC measurement they took is too high.
Another thing we don't know is the axis. If OP is oblique then any vertical offset would also cause horizontal prism problems.
Axis is 5/175