How do i find out the Dioptre of my glasses?
463128
Your prescription is the power in diopters of your glasses.  No conversion necessary.  If you don't have your prescription, your eye doctor can use a special instrument to read the power of your glasses.
320305
The other mathematical formula to remember (the last one, I promise) is the one that tells you the twilight factor of your instrument, i.e.; how much light will be transmitted to your eye. This is found by multiplying the magnification by the size of objective and taking the square root of the result. Again, using the 7x50 as an example, i.e. Ö7x50 = 18.71 twilight factor. The larger the result the better the theoretical light transmission with 15 being good and 25 being excellent. I say theoretical because if you were to compare two optical instruments of like size, the more expensive one would give you a better image due to the quality of glass and internal finish.\n\nAs in all things there are provisos however. The optical advantages between one or other of the top manufacturers are tiny and can be measured by a very few minutes’ difference at last light, and really the choice boils down to which instrument catches your eye or sports the niftiest badge. Secondly, the superior optical performance of an expensive instrument can be degraded by a single scratch. Yes! One scratch on the front lens will degrade the image in your £600 glass to that of a £250 one.
586805
yes go to an optometrist
162543
Is there a question somewhere there?\n\nWhen you look in a telescope you shouldn't need to wear glasses just adjust the focus till the image is clear.  The type of eyepiece you use doesn't matter.
409574
go here and enter the serial number from the back of your monitor. you may need adobe pdf viewer to read it. it's a free download,\nhttp://www.viewsonic.com/support/userguides.cfm
367001
Buy a magnifying glass.
534267
You won't find them with a -2.75 BC (base curve).  -2.75 is the power.  The base curve will be a number like 8.3 or 8.6.  If you're confused about your prescription, you should talk to your eye doctor.
978638
try this:\n\nhttp://www.ritsumei.ac.jp/~akitaoka/index-e.html\n\nhttp://www.archimedes-lab.org/index_optical.html
488914
Wear magnifying lenses.
95831
Lazy Eye, look up AMBLYOPIA on the link below
516904
People wear glasses for several reasons. People who have "fuzzy" vision when they look at distant objects are called nearsighted (myopic). In these people, the image is focused in front of the retina. The lens of glasses needed to correct vision in nearsighted people is concave. People who need glasses for reading and who have "fuzzy" vision for objects close to them are called farsighted (hyperopia). In farsighted people, objects are focused behind the retina. The lens of glasses needed to correct vision in farsighted people is convex. Astigmatism is another reason that you might have to wear glasses.
133856
An excellent place to look for this is at thrift stores. You can check Goodwill, Salvation Army, your local hospice probably has a thrift store. This way, you have a good chance of getting the real thing, not a "reproduction". If you want them for your prescription eyewear, just clean them thoroughly, and take them to your choice of eyewear providers. They will put your lenses in the frames, and, voila! For probably a quarter or less you have exactly what you are looking for.........quality included.\nI would like to add, that I am on a very tight budget. I wear solid gold wireframe glasses. I paid 25 cents for them at Goodwill, and did as I instructed you. There's no possible way I could afford these frames retail. This advice will also help in other facets of your life. I drive a 7 year old BMW (for example) I have a car that originaly sold for close to $50k, I paid $10k for it. It looks/drives as good as when it left the showroom. My friends have no idea how poor I am.
116040
Im afraid my eyes arent good enuf to see that far... Its an unaswerable question
229198
Do a search on the Adidas Eyewear site:\nhttp://www.adidas.com/eyewear/homesite/index.asp\n\nUse the "Also search within" options to widen your radius search for the particular Denver zip code you live in.
208100
As one gets older the elasticity of the our eye lenses decreases and we require two sets of glasses, viz.\n1) Reading glasses- These are to see the things that are closer to the eyes clearly ( about 8 to 20 inches from the eyes.) This is the distance at which we usually hold any reading material, hence they are called the reading glasses.\n2) Distance or distant glasses- These are to see the things that are at a considerable distance from you for example an approach friend on the road can be clearly seen and identified with the help of these glases only.\n3) Binoculars and telescopes are just that. Binoculars and telescopes. The first is to see objects that are no normal eye can see due to the great distance ( Bird watching)\nTelescopes are for the astronomical observations that is they can see beyond the range of the binoculars.
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Go to your eye doctor and get tested.
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To check for a polarised lens take a watch (digital) and hold the glasses in front of it. Rotate the glasses through 90 degrees (top becomes side). The display should disapere or some of is should dissapear.