Outstanding, thanks. I'm feeling very well equipped to nail this down. Cheers! Ian
On Oct 31, 11:26 am, Chuck Knight <[email protected]> wrote: > Unfortunately, it's not as simple as a linear calculation. BUT, the > rule of thumb is as follows: > > Distance prescription = 20' to infinity > Computer prescription = 24-36" > Reading prescription = 12-24" > > In your case your ADD (reading correction) is a +2.00, which means > that an additional +2.00 diopters (for a total prescription of -/25 + > 2.00 = +1.75) gives you clear vision at 12-24". For a computer > prescription, it would be half of that extra strength...+1.00. > > BUT, there's an easier way...and especially since your regular > prescription is so extremely slight at only -0.25. Just go to your > nearest WalMart or discount store, and try on some reading glasses. > Try them, with your eyes, at various distances...experimentally > determine which gives you the vision you require at the distance you > require. > > And, while we're at it, be aware that yours is a somewhat special > case. DISCUSS YOUR REQUIREMENTS WITH YOUR DOCTOR...standard reading > distance, while useful for most, may be irrelevant to you. Instead, > clearly seeing a column wheel at a distance of 6" or less may be of > paramount importance. > > Ask him also about monovision. You're already using it...regular > vision in one eye, and magnified through a loupe in the other. My own > loupe clips on the side of my glasses. > > Monovision is not a common option, especially at the normal > dispensaries, but there's no reason that it wouldn't work for you. > > -- Chuck Knight > > On Fri, Oct 30, 2009 at 10:53 PM, clocker <[email protected]> wrote: > > > Hi all. > > I have another question. > > > While I was thinking about what Chuck and Ed had to say about my last > > questions I got thinking about task specific glasses for close work. > > > I'm sure glasses that are specifically designated to suit viewing ones > > computer screen would be very popular. I'm developing a few ideas of > > my own on what might be handy. > > > How do you specify the changes, from whatever the default is, in > > relation to ones prescription? Or does the vendor do that for you if > > you provide a verbal confirmation of the desired distance? > > > I'm thinking specifically about a desired reading distance, but not > > exclusively. > > Ian --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
