> Just today I got examined by an Optometrist who gave me the following
> prescription:
[quoted text clipped - 9 lines]
> thanks
> Bill
It is the same only written differently. Minus cylinder and plus
cylinder powers.
the newer right converts to -.25 +1.00 X 25
the newer left converts to -2.00 +1.75 X 178
the formula is: add the sphere power to the cylinder power (1st and 2nd
numbers) for a new sphere total, reverse the sign of the cylinder power,
add or subtract 90 (so the new number is less than or equal to 180) for
the new axis.
to understand that they are the same, think of this:
using the new left eye powers:
"the power is -2.00 at axis 178 and the power is (the sum of the two
numbers) -.25 at axis 88 (perpendicular, 90 degrees away)."
as it was written the first time,
"the power is -.25 at axis 88 and -2.00 at axis 178.
--LB, O.D.