Held Reading Magnifier

I've always been very near sighted and have a considerable stigmatism in both eyes. My first bifocals were at 25, but switched back since they no longer work as well for me. New dr. says it's nearsighted but also because the receptor cells (we all have rods and cones in our eyes to distinguish light/dark/color shapes) are spread too far apart. I'm corrected at 20/40, but closer to 20/50 now. Bye bye night driving!

He wasn't terribly helpful in what to do, other than get a hand held magnifier, so that I can keep up with my course work. Any tips/tricks or things to ask for so I can keep up with all this college work?? Reading a couple of hundred pages each night and working on this computer was a challenge last term; it's getting harder and harder to do this. So, what's a book loving girl to do??

I'm not sure you're looking at this 'right'. I may not be either as there are so many ways to work through this.

Basically, the way the lens thing works is, the more powerful the lens, the more it bends light. The formula where the Power of the lens or P is equal to 1/d where d is in meters helps.

If a lens is focused at a meter away, +1
half meter, +2
third of a meter, +3
quarter of a meter, +4
fifth of a meter, +5

bonk.... sorry, hit my head on the computer....



If you are "near sighted" then you are already focused closer than infinity or far away. If you are focused at a meter away, you are +1 too powerful and need to use a -1.00 to neutralize that power or move the focal point out to distance.

If you are a -2.00 myope you are focused +2.00 too powerful or a half meter away... etc etc etc.

When 'reading', one should try and get a lens that allows you to see at the distance you are doing the work. But if you are already near sighted, then you may not 'need' a lens. Just take off your glasses. But if you use your distance glasses, then read, you'll need to move that distance focal point up to reading distance.

Most of us read at a little further away than a third of a meter. So the +2.50 or +2.75 lens or add to our distance lens works great. One MIGHT want a little depth of focus, so optometrists will measure your ability to focus close,.... for instance if you move your finger closer and closer till you can't see the fingerprint anymore, that's your "near point". If that is for instance a quarter of a meter, then the optometrist will recommend that you get an add of about +2.00 which is half the +4.00 of your ability. That's how the thinking goes.

A computer is about maybe a +2.00 distance or half meter away, or thereabouts. figure it out for yourself, and try the plus lenses at the drug store for testing which reading Rx is good for you. You can figure it out so you don't get fatigued.

Now the real problem is that if you have astigmatism, you should use your distance Rx which corrects for that, then move that distance focal point closer to the distance you want to read. That way you won't be fighting the astigmatism distances or circle of least confusion blur, etc.

If you really have problems, go to a good Optometrist. This is what they are trained to DO, figure out these optical problems so that you can see well, without fatigue or other asthenopic symptoms. It's worth the $ to get the right Rx.

2008-12-29 19:33:51 by Teresa

Great compact and handy designed for 3X Glass Reading Magnifier! The Hand Held Magnifying Glass is perfect for you to reading map,newspaper ...