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Ordering "Glasses" On-Line -- Astigmatism
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Ordering "Glasses" On-Line -- Astigmatism
Posts: 845
Threads: 102
Joined: Jul 2006
Dear Friends,
Subject: How to convert you prescription to "no astigmatism".
I truly hate the "astigmatism" prescription.
It is very rare that that "adjustment" would prevent 20/20. If less that 2 diotpers (cyl) or (astiigmatism) I always INSIST that I get a "spherical" prescription, i.e., NO CYC.
I have never had a problem with this sincere request. But if I ever did -- I would find another OD who would comply with my request.
Since some of you are ordering "reduced" glasses on-line, here is how you "convert" a "prescription" to Spherical-Equivalent:
You simply divide the Astigmatic part in half, and then add it to the first part of the prescription. Just ignore the "angle" part of the prescription.
For Example -- you have this prescription:
-2 diopters, Cyl -2 diopter, Angle 75 degrees.
This becomes:
- 2 diotpers - 2 diopters astig / 2 = -3 diopters (Spherical Equivalent).
As always, check your Snellen, with this change, and I think you will always pass the DMV with it -- as required.
Best,
Otis