Need my galsses' rx interpreted

[Randolph]

I changed the frames of my glasses and I needed new lenses made to fit the new frames even though the prescription stayed the same. When I put the new glasses on it looked different than with the old ones on.

I had the rx of the new ones checked out and here's what it shwed:

Right:
S: -1.50
C: -0.75
A: 28

On the form with which I ordered the glasses it says:

sph: -1.50
cyl: -0.75
os: 30 (I suspect this might be labeled differently in English speaking countries)

So is this thing that came out different by 2 on my new glasses be significant?

Also, there was one other parameter in the paper I got from the people that checked out the glasses:

Right: P: I 0.00 U 0.00
Left : P: O 0.00 U 0.00

What does this mean? Why is it I on the right lens and O in the left?

[gz9gjg]

Randolph,

What do you mean, "I had the rx of the new ones checked out"? If someone was trying to figure out the prescription by measuring the physical lenses, you should know the method is not very exact.

Lens notations vary.

"SPH" is the spherical correction that is "all over" the lens. The "-" in front of the 1.50 means it is for nearsightedness (myopia).

"CYL" is the correction for astigmatism. Usually there is an angle of orientation called out, maybe that's what the "A" means.

"OS" means the left eye, from the latin "oculus sinster".

"OD" means the right eye, I don't remember the latin word for "right".

There is another lens parameter called "prism" which is used to correct double vision. Maybe that's what the "P" is for.

[gz9gjg]

..........

[Randolph]

Thanks for your answer!

Randolph,

What do you mean, "I had the rx of the new ones checked out"? If someone was trying to figure out the prescription by measuring the physical lenses, you should know the method is not very exact.

I see.

Usually there is an angle of orientation called out, maybe that's what the "A" means.

Ah, in that case os is axis (translated from my language).

[qoute]There is another lens parameter called "prism" which is used to correct double vision. Maybe that's what the "P" is for.[/QUOTE]

Nope, don't have double vision.

Do you think this 2 difference in axis (which, granted, might be accounted for by the inaccuracy of the test) might make a difference? It's odd, the lenses are the same but when I put them on in looks different (if anything is wrong it's the stuff that corrects astigmatism).

[gz9gjg]

Hello Randolph,

Astigmatism correction can be written our several different ways, but mean the same thing in the actual lenses. I am not a doctor and so not give valid examples.

Regards,

Lynne