Wanting to order some single vision reading glasses.
You say to SUM the SPH and ADD values. For my right eye these numbers are SPH -4.75 and ADD +2.25. Would this SUM = -2.50....OR.....some other number? Not sure how to calculate this.... Chuck Knight wrote: > There are 4 columns of numbers...SPH, CYL, AXIS, and ADD. > > SPH (sphere) is the amount of correction you need to see, at infinity. > CYL (cylinder) is the amount of correction you need for astigmatism. > AXIS is how that cylinder should be placed...twisted at what angle. > ADD is the extra sphere help that you need, for reading. > > To make a single vision pair for reading, you do the following: > > Sum the SPH and ADD values, and enter it into the SPH field. > Leave the CYL and AXIS values the same. > Leave ADD empty > Subtract 3mm from your standard distance PD. > > That should get you the results you want. > > -- Chuck Knight > > > > > On Sun, May 17, 2009 at 5:45 PM, Chris Scott <[email protected]> wrote: > > > > > How do I read my RX to get reading glasses only? > > > > I've got my current RX, along with measurements taken by an > > optometrist a couple of years ago. But I have no idea how to read or > > interpret them. > > > > Any help or explanation would be appreciated! > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
