This article offers some clues: http://www.company7.com/library/televue/Astigmatism_RX.pdf
After reading about this myself, I think that 0 is the same as 180, just easier to write, but I think you should wait until you hear from someone who knows for sure. --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://glassyeyes.blogspot.com! You received this message because you are subscribed to the Google Groups "GlassyEyes" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/glassyeyes?hl=en -~----------~----~----~----~------~----~------~--~---
