I assume that you are far-sighted to have a + sphere. Yes, your sphere would be +3.00 for reading glasses and +1.75 for computer glasses.
As per Zenni Optical's site: Single vision reading glasses – Combine the Add and Sph numbers. In the case of the Positive Add and a negative Sph, net the difference, and the new number becomes the Sph. The Add data entry field will be blank, by virtue of it having been combined with the Sph number. If your Sph is already positive, you simply combine the positive Sph and the Add number, using it for the new Sph. The Add data entry field will be blank. For single vision reading only, you narrow the PD by 3mm from the distance vision PD. Multi-focal Computer/Desktop glasses – To create this modification, you simply split the Add number in half (if there is no equal division of the Add number, you’ll need to decide if you want your focus closer or further, and the quarter diopter difference will shift the depth of the focal plane, accordingly) and combine half of the Add with the Sph. The balance of the Add will stay in that data entry field. Note: We do not create a multi-focal lens with an Add of less than +1.00. Use your distance PD, unless your monitor is extremely close (less than 18”), in which case, you may wish to narrow the PD by a millimeter or two. On Feb 8, 12:51 pm, Firewalker <[email protected]> wrote: > I know I've seen this on here somewhere but can't seem to find it. > If ordering a pair of straight reading glasses, how do you adapt your > presciption from the multifocal (ADD) to just single vision for > reading only specs? Say my sphere is +0.50 and my ADD is +2.50, would > I just add them together and put +3.00 in the sphere section? > I assume the cylinder and axis would remain constant...correct? --~--~---------~--~----~------------~-------~--~----~ 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 [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 -~----------~----~----~----~------~----~------~--~---
