This is something that bothered me off and on since I started as an optician, but I'm finally going to ask it why are two different symbols used for diopters.
What I mean is for Sphere and Cylinder wrote independent of a full RX all I ever seen used is D (or DS and DC for sphere and cylinder respectively)
But for prism all I've seen used is Δ.
Why the difference?
A question about the symbols used for Diopters
What I mean is for Sphere and Cylinder wrote independent of a full RX all I ever seen used is D (or DS and DC for sphere and cylinder respectively)
But for prism all I've seen used is Δ.
Why the difference?
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