Yes, computer lenses would be for primarily presbyopes. Although there are exceptions to the rule. For instance, some strong myopes could possibly benefit from a milder strength lens for mid-range work. If you're having trouble focusing on your computer screen with your single vision lenses, I'd have my eyes rechecked and tell the OD about it. It's possible your becoming an emerging presbyope. If you're nearing 40 years old or more, that would be a very good possibility.
-=# Firewalker #=- On Mar 22, 5:54 am, John Szlachta <[email protected]> wrote: > Ok I see now. This is for people who normally wear a progressive lens > that are using a single vision lens for a specific task(s) at a > specific distance. Sorry, I spoke with my trusted eye doctor and asked > him about a computer prescription for my correction. He said there was > no such thing, but that's because I only wear single vision lenses - > although I do a lot of computer work. > > One last question, are the computer lenses primarily for presbyopia? > Or do you guys using computer lenses also have hyperopia? > > Thanks for the clarification all- > > John > > > > On Sun, Mar 22, 2009 at 4:36 AM, Chuck Knight <[email protected]> wrote: > > It's simple, John. Certain people need help focusing at certain distances. > > > The traditional bifocal prescription involves different corrections for > > distance (infinity) and reading (12" away) use. Guess what...unless you sit > > unusually close to your screen, neither one of those is the right strength > > for working on a computer! Or a typewriter, or even a desk, truth be known. > > > So, they came out with the "computer prescription," which is the right > > correction for an object (monitor) that's just about at arm's length. Works > > well for people who work at desks, all day long... One other benefit is the > > wide field of vision. No matter how good a pair of bifocals or > > progressives, the relevant part is *tiny* compared to a pair of single > > vision glasses. I don't yet wear bifocals, so I can only imagine what it's > > like. I have a 24" monitor, and can't imagine peeking at it through > > something as tiny as a bifocal. > > > There's one other benefit to it, the way we buy glasses. Single vision > > glasses are so cheap online, that we can have specialized pairs for > > specialized tasks. If I had to pay $400 for a pair used only with my > > computer, I would complain...an extra $8-13 doesn't hurt nearly so much. > > > -- Chuck Knight > > > On Sat, Mar 21, 2009 at 6:13 PM, John Szlachta <[email protected]> wrote: > > >> What's the story with computer lenses? Is this some kind of marketing > >> ploy? Why would you wear single vision lenses in anything other than > >> your full correction? Unless I'm missing that we're talking about > >> progressive lenses here. > > >> iPhone > > >> On Mar 21, 2009, at 8:37 PM, Firewalker <[email protected]> > >> wrote: > > >> >> I just ordered 1 more pair tonight for computer use. > > >> >> My normal perscription is > > >> >> OD -3.50 -1.50 X 24 > >> >> OS -4.50 - 1.50 X 165 add + 2.25 > > >> >> I ordered for computer > > >> >> OD -2.50 -1.50 X 24 > >> >> OS -3.50 -1.50 X 165 > > >> >> Is that correct? > > >> > If that ADD +2.25 is for both eyes, and not just for the left eye as > >> > shown, then yes, that is correct. > > >> > For the record, computer (or intermediate) glasses would have approx. > >> > half of the ADD power added to the original SPHERE value. When it's an > >> > odd number like +2.25, then you'd add either +1.00 or +1.25 to the > >> > SPHERE value. > >> > Just remember, if your original SPHERE is a negative (myopia), then > >> > adding power to it would make the SPHERE go the opposite direction. > >> > (-3.50 ADD +1.00 = -2.50). > > >> > -=# Firewalker #=-- 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 [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 -~----------~----~----~----~------~----~------~--~---
