Your ophthalmologist, optometrist, or optician should explain that to you . . .
whoever it was that wrote the prescription.
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its got tod od somthing about maths that's all i know
It means you are REMARKABLY smart!!! It is in the top 1% of all the population.
trapezoid
OD is Outside Diameter - at least when you are talking about pipe...
There is no corelation between a cylinders ID to OD.