Thanks Ed, that's exactly what I was looking for!! :) On Feb 8, 8:49 pm, EdT <[email protected]> wrote: > 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?- Hide > > quoted text - > > - Show quoted text -
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