Differences in how prescriptions are written?

I have heard that prescriptions can be written in different ways. This is based on the fact that one person can write astigmatism prescriptions in + diopters or - diopters. So I ask, how does this work? Can any of you translate my prescription into one with a negative diopter astigmatism and then explain how you translated my prescription? And can you explain how you translate other prescriptions in general from positive to negative diopters of astigmatism? And how to do it in the reverse?

My prescription is :
Right : +1.00 diopters sphere/farsightedness, +1.00 diopters cylinder/astigmatism, 120 axis.
Left: -3.25 diopters sphere/nearsightedness, +.50 diopters cylinder/astigmatism, 90 axis.

EDIT: Okay, I found a website that explains how to do the conversion:

http://www.tedmontgomery.com/the_eye/gla...

That was helpful. Are there any other details I need to know?

Nothing other than Optometrists generally write in - and ophthalmologist in + and either way you write it it comes out the same in glasses

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