Sorry for the confusion. I just wanted to write the rx in the common readable form so that his on line site would be more l;ikely.
Yes Chuck, you add the add to the sph which gives you +3.25 -.50 X 100 +2.75 -.25 x 95 +2.75 +.50 x 10 +2.50 +.25 X 5 this is written in plus cyl form, note the plus sign on the cyl cloumn. This is used mainly by older ophthamologists. Most now write in minus sign form, first of all because its the way the glasses are made. They can be converted vy transposition and are equilalent. If in plus cyl you 1. Add the cyl to the sph, dont forget minus and plus math 2. change the cyl sign to - 3. leave the cyl number alone 4. move the axis 90 degrees. wasnt trying to make it so complicated, buyt my fear was as a newbie he might punch his cyls into a form which assumes minus, many do. I supose the sites do check for this. But there you go Chuck, another little trick. I heard you're quite a brilliant guy Sincerely Michael Katz OD On Sep 22, 1:18 pm, "Chuck Knight" <[EMAIL PROTECTED]> wrote: > Frankly, I'm confused too. I've always been told that the combined total of > the sphere and the add equals the reading prescription. > > But, if my results differ from those of an eye doctor I always defer to the > expert. > > -- Chuck Knight > > > > On Mon, Sep 22, 2008 at 11:36 AM, Ev <[EMAIL PROTECTED]> wrote: > > > As a bystander, I'm confused - why is Chuck's interpretation different > > than online Doc's? > > Am I missing something here? > > > On Sep 21, 11:22 am, onlineIDoc <[EMAIL PROTECTED]> wrote: > > > NV rx: > > > > +3.25 -.50 X 100 > > > +2.75 -.25 x 95 > > > > transcribed to (-)cyl form as more popular (and technically correct) > > > > On Sep 21, 11:10 am, "Chuck Knight" <[EMAIL PROTECTED]> wrote: > > > > > His reading prescription is simple. It's calculated as SPH + ADD. In > > his > > > > case that's (+0.25) + (+2.50) = (+2.75). > > > > > He has astigmatism (CYL and AXIS), too, so his readers will be a bit > > more > > > > complicated than the average drug store pair. Should work better, too! > > > > > You said he usually wears +1.50? These will be quite a bit stronger. > > > > > -- Chuck Knight > > > > > P.S. Be sure to include an accurate PD reading!!! > > > > > On Sun, Sep 21, 2008 at 9:25 AM, AuntieM <[EMAIL PROTECTED]> > > wrote: > > > > > > Hi there! > > > > > > Now that I have successfully ordered several (okay ... FIVE) pairs of > > > > > single vision glasses from Zenni, my husband is interested in > > > > > purchasing some durable readers in a titanium frame from them. He > > does > > > > > not wear glasses except for reading/close work. Recently he went to > > an > > > > > eye doctor for the first time in ages and received the following > > > > > prescription: > > > > > > SPHERE CYLINDER AXIS ADD V/A > > > > > OD +025 +050 010 +250 20/20 > > > > > OS +25 +025 005 +250 20/20 > > > > > > Am I correct that if filled as written these glasses would be bi- > > > > > focals? Since he doesn't wear glasses all the time (and > > > > > notwithstanding the prescription, he probably won't any time soon), > > > > > how do I order a pair of readers for him based on this prescription. > > > > > Is the ADD value of +250 the equivalent of a 2.50 magnification pair > > > > > of readers off the rack? I ask because he usually buys 1.50 readers > > > > > from the store. > > > > > > Any help you all can give is MUCH appreciated. Thanks in advance.- > > > > > Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://www.glassyeyes.com! You received this message because you are subscribed to the Google Groups "GlassyEyes" group. To post to this group, send email to glassyeyes@googlegroups.com 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 -~----------~----~----~----~------~----~------~--~---
