Optiboarders, an order I recently received from one of my labs has me curious about the miracle of prism thinning.
I know why prism thinning is implemented in the surfacing of various lenses, but I'm curious about how, say, an anisometropic set of lenses might affect the prism thinning process.
In order to not manufacture an intolerable amount of induced prism, I know that prism thinning should be yoked and that the amount should not exceed 0.6 times the add (up to 2D for a +3.00 add [citation needed]).
The job I received yesterday has the following script:
-1.25 -0.75 x033 +2.75 Add
+1.25 -0.75 070 0.5 BU +2.75 Add
With the OS base up prism, the OC of that lens (as measured at the PRP) should be higher than the OD OC, however it's reading about 1D lower. When I called the lab about this, they said that their prism thinning algorithm shows the OCs going in opposite directions and that it factored the patient's BU prism into the equation. We sold the patient a digitally surfaced PAL, but not compensated. The lab owner then proceeded to tell me that if the patient has any issues that I should just give her vodka. Though I appreciate the levity, I just wanted to throw this story to the proverbial wind and have my esteemed Optiboarders-in-arms offer their input.
Does lensmanmd have his own version of a bat signal?
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