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Medical Forum / General / Vision / July 2007Do I have "with-the-rule astigmatism", and what does that mean?
Do I have "with-the-rule astigmatism", and what does that mean? Hee's my script: OD: Sph: -3.00; Cyl: Sph; Axis: Balance; Prism: Balance OS: Sph: -3.75; Cyl: -1.00; Axis: 168; Prism: 0 Also, why does the cylinder component on my OD say "Sph"? And what does "balance" mean? > Do I have "with-the-rule astigmatism", and what does that mean? Yes. It just means that most astigmatism clusters around the 180 axis. Mine is 090, and that's called "against-the-rule". The majority of astigmatic prescriptions fall within +/- 20 degrees of 180 or 90. The remainder are called "oblique." > Hee's my script: > > OD: Sph: -3.00; Cyl: Sph; Axis: Balance; Prism: Balance > OS: Sph: -3.75; Cyl: -1.00; Axis: 168; Prism: 0 > > Also, why does the cylinder component on my OD say "Sph"? Because your refraction is spherical. There is negligible difference between the vertical and horizontal meridians. > And what does "balance" mean? The meaning of "balance" is not clear in this context. Presumably it means "no prism". -MT > > Do I have "with-the-rule astigmatism", and what does that mean? > [quoted text clipped - 20 lines] > > -MT Dr. Ryan said I actually needed a -11 lens on my right eye, but since it's amblyopic, there's no use. So he gave me a -3 lens w/ a balance for the axis and prism for my right eye. The right lens should be a sphere of ~-3.00. Don't put cyl in as it may cause spatial problems. |
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