Optometrists write in minus cylinder form (makes for smaller, thinner lenses), while ophthalmologists write in plus cylinder form (which translates into "surgical" talk). These prescriptions are actually almost the same. Go to a calculator online for "converting plus to minus cyliner."
Best of luck,
Timothy D. McGarity, M.D.
Converting Minus to Plus Cylinder:
Add the magnitude and power of the cylinder to the sphere = New sphere power, then keep the magnitude of the cylinder the same, but change it's power to plus and rotate the axis by 90 degrees:
Your right eye:
-2.25 sph (+) -0.25 cyl =-2.50 sph ("new sphere")
-0.25 cyl 150 axis = +0.25 cyl 60 axis ("new cylinder in plus form")
-2.50 sph +0.25 cyl 60 axis
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