Strength of spectacle lens?
147056
It depends because the length of the patient's eye and the distance of the object also play a role in the power needed.  MOST eyes need a total power of approximately 60 diopters, but this is a highly variable number.
218555
it depends on the shape of your eye
72595
There are many different types of lenses. Here's a site with good information.
488914
Wear magnifying lenses.
148376
I don't have a specific answer for you, but have you tried asking your local eye doctor or optician?  They have access to just about everything available and may be able to point you in the right direction.
873065
The lens in your eye may be too strong and thus focus the image of the outside world in front of your retina, or it may be to weak and focus the image behind the retina.  By placing a lens (glasses) in front of the eye, we can compensate for this by ensuring the image falls exactly on the retina, which allows for good vision.
444224
Sorry to hear of your loss. Although your description gives me an idea, I thought I would attach some information for you to read. I tried to attach a picture to this response but the software is not suitable. Instead, please see the following website and refer figure 11, page 36. http://www.ski.org/Colenbrander/Images/Measuring_Vis_Duane01.pdf#search='measuring%20vision%20loss'\nIf you are not familiar, copy the line above and paste in your browser, it should take you to a pdf file. If you can not get pdf, you can download it for free. \n\nIf you still are unable to obtain this information, email me at jodygrissom@yahoo.com and I will send it as a file for you. \n\nBased on your limited information, I estimate that you have lost between 25-50% of your vision. But it is complex and I am not a physician.
334825
Glasses, contacts, and Corrective eye surgery
406370
More light is needed as the magnification is increased since the size of the hole of the objective lens decreases. Try it!
330033
Very strong. Good field.
895656
Hi. You could start here : http://www.mellesgriot.com/products/optics/oc_3.htm\nMay not be the best for everyone.
925423
I used to manage an optical shop so I can tell you from experiance.  If you are able to get the exact same type of frame than you can put the old lenses in them.  If you cannot find the same frame than it will not work.  If the frame is too big for the lens than it will fall out.  If the frame is too small than it will put presure on the lens and warp it not only causing damage to your eyesight, but also possibly break the lens (not a good idea that close to the eye.  Another thought to try to save money...If it broke at the weld on a metal frame try to take them to a jeweler and ask them to reweld them.  This option should only cost you $10 - $15!\nHope this helped.
491576
There's no reason why your nearsightedness should interfere in your weight training, unless your lifting weights with your eyeballs. Just make sure if you wear glasses that they're secured by an elastic or headband so they won't slide off your nose if you get all sweaty.
933597
Wearing contact helps - coz ur center does not change - and has more sharp / focus than glasses.\nIf u follow eye related healthy diet/exercise - u can get by with a smaller no, like  -1.75 for starter, and help it reduce further (coz ur eye will not suffer strain from change of optical centers, etc - as is with glasses...\nTheoretically, one cannot go beyond 20/20, it is perfect vision...
744055
I tried multi focal and they are really difficult to get used to.  I went back to mono, its easier  to change spectacles than keep moving your head around to keep the image focused in the "sweet spot" in the multis....:D
354436
(m)\n\nField of View or Field Diameter is very important in microscopy as it is a more meaningful number than "magnification".  Field diameter is simply the number of millimeters or micrometers you will see in your whole field of view when looking into the eyepiece lens.  It is just as if you put a ruler under the microscope and counted the number of lines.  \n\nThe chart below will tell you (approximately) what to expect when looking through a microscope with varying combinations of eyepiece and objective lenses.  As an example (in green below), a dual power stereo microscope with 10X eyepiece lenses and 1X and 3X combinations of objective lenses, would have total powers of 10X and 30X and your field of view would be 20 mm and 6.7 mm respectively.  \n\nThis means that an object 20 mm (2 cm, or about 3/4 inch) wide would fill up the whole viewing area at 10X and an object about 6.7 mm wide would fill up the whole area at 30X.  As you can see, having the highest power may not be best for your particular application.  When you move to greater magnifications, you sacrifice field of view.
583537
Adding to the above... If you can afford it and you want more than about 7x magnification, you should consider buying IS (image stabilizing) binoculars.   These need batteries, but dynamically correct for the shaking of your hands.  You can get them up to 15x magnification.\n\nAlso, it's important to consider what you want to use the binoculars for.  If you're going to use them at comparatively short distances, you don't want a pair that magnify too much because you'll have to keep moving the glasses around to see entire objects.  (That's why opera glasses, which are a form of binocular, are such low magnification - typically 2-4x).   Also, if you plan to use them at night or in low light, you want a large objective lens size (50mm or larger) because that allows the glasses to gather more light.\n\nLastly, if you'll use them in unstable situations (like a moving boat), consider the size of the exit pupil.  This is the objective diameter divided by the magnification, and measures the diameter of the image which your eye looks at.   This is important because it affects how precisely your eye has to be lined up with the eyepiece for you to see the image.