Do hi-index lenses make  noticable difference?
967565
YOU MIGHT WANT TO SPEAK TO YOUR DOCTOR AND SEE IF THEY CAN FIX THEM WITH AN OPERATION, HAD MINE DONE ABOUT 4 YEARS AGO AND ITS REALLY GREAT....TED
303018
Did you buy glasses? It sounds about like the price and description of two lenses. If your didn't buy glasses, you'd better ask them, maybe they made a mistake.
781828
Absolutely. It may not be the most comfortable (stand off distance between the diopter piece and your glasses) and there may be a slight reflection in your glasses; but, it's not out of the question. The newer AN/PVS-7 NVGs have an adjustable diopter lens that allows you to use the NVGs without corrective lens'. \n\nIf you had to wear corrective lens' I would recommend using glasses in the field/combat when you have to utilize your NVGs. Just remove your glasses and flip down the NVGs. Since they're already set to correct your vision, just flip them back up and put on your glasses when you're done.\n\nContact lens would be the most comfortable; however, the down side of contact lens' is the maintenance and up-keep in the field/combat.
379777
Yes - to protect your eyes from the sun's harmful rays.  As for looking for good ones - beyond style and fit - make sure the lenses have max UV protection.  Talk to someone in an optical department about it.  UV A and UV B protection is what you want to have.
154725
The difference is....if you place a screen where the images is suppose to be and you can actually see an image, then it's real. Otherwise it's virtual.\n\nThis applies to diverging lenses, among others.\n\nAs much as I dislike using websites in my responses, sometimes it can't be avoided....like now.\n\nIn the link below, about half way down it talkes about a little a virtual image.\n\nHope this helps you.
220793
are they new? If so, you may have the wrong prescription. In either case, see your eye professional
349142
We do a very complete exam. Not a little quick doc-in-the-box exam. And we charge $65 dilation and all. Yo can get cheap glasses for around $70. Frames are actually much better after you get past the $120 range. Lenses can range from $59 to around $600 for all the bells and whistles.\n\nCan you be more specific?
728593
i actually tried that before when i wasnt wearing my contacts....and yes you can see better if you squint really hard...its pretty neat u should try it sometime and see for yourself!
271368
I don't think wearing contacts makes it worse. In an old wives tale, carrots made your vision better. You can get a lasar procedure to make you not have to use glasses or contacts!
648069
If you need them all the time then wear them all the time.  It's not wearing them when you need to that makes them worse. -- My husband wears eye glasses and his prescription barely changes enough to notice --
44487
Something is wrong with this question. I see it is 2 months old and would write directly if you allow email.\nI think the question should be about the object not the image. If the object is at the focal length of the lens, then the rays are parallel and easy to see with the eyes. The only image is on the inside of the eye.\nIt doesn't make sense to have length anywhere.
51120
It might take a little getting used to because progressive lenses don't give you quite as big of a field of view in the center of the lens.  I don't think I've ever heard of a person not thinking that progressives were worth it.  If you aren't sold on the idea, another option is a trifocal, but you don't get quite the versatility with that as you do with a progressive.  A progressive will give you a wide range of close distances that you can see clearly and a trifocal will only give you 2.  Hope this helps.
964811
No.  The binocular is fine, but for most people 8X is about the highest power to hold by hand.  If you are steady you could try up to 10X but even then you would have to hold it agains something steady.  With 11X it would be very hard to hold them steady enough to really see something.
118241
Glasses and contacts will NOT make your eyes worse.  Not everyone's eyes get so bad that they have really strong prescriptions.  Since you're a kid (and worried about your eyes getting really bad), you might want to ask your eye doctor about something called the COMET 2 study.  This is a study that's trying to find out if bifocal or progressive lenses slow down the progression of near-sightedness.  Take it with a grain of salt, though, because if it does help, it doesn't help very much.  The best thing for you to do is to take good care of your eyes and don't over-work them.  (If you're doing a lot of reading, for example, take breaks every once in a while.)
156368
No. You may see a distorted image, but it is not what the person themselves see without glasses.\n\nI'm high-myopic, -9 to -10, and people would look through my glasses and say "wow, do you really see like that?"\n\nI'd have to tell them "no. That's the correction to my vision, not the way I see without glasses."\n\nOne day, by accident, I found common lenses that would let me show other people what my uncorrected vision was like. I picked up a double pocket magnifying glass. It had two ordinary magnifying lenses in it that could be swung out one at a time or both at once to increase magnification. With both lenses out, while I was wearing my glasses, I looked through the magnifiers at a distant wall. I realized that what I was seeing was the same as I would see without any glasses at all! \n\nSince then I've had a way to show people roughly what I see like without glasses. For extreme nearsightedness, put two standard magnifying glasses together and hold them to one eye about where normal eyeglasses would sit and look at something distant. If you're vision is in the normal range, you'll approximate my uncorrected vision.\n\nIn general, I believe, if you want to know what it is like to see what another sees *without* their glasses, and your vision is withing normal limits, you would need another pair of glasses made to the *opposite* prescription. Theirs corrects the prescribed amount, your vision would have to be distorted that same amount.\n\nMy trick wouldn't show you how someone farsighted sees. You'd need a different type of lens. In general, correction for nearsightedness like I've got is done with lenses that make distant objects smaller and darker. Correction for people with farsightedness is accomplished with lenses that are more like magnifying lenses.\n\nThis doesn't even deal with other problems with the eye, such as astigmatism or presbyopia.\n\nThere's one plus to my vision that most people don't realize -- when I take my glasses off, I see magnified up to a distance of about four inches. I can literally read engraving on the head of a pin.\n\nThen there's what Spider Robinson said: "People with glasses are lucky. We can see stars on rainy nights."
401186
It's called simultaneous viewing.  You actually look through the distance, near, and intermediate portions of the lens at the same time (they're each determined by a different curve on the lens).  Your brain automatically selects the clearest image.
943525
You need to adjust your contrast.