I want to know which one sees far and which one sees near, negative number eye glasses (eg -3) or positive number eye glasses.
128888
Negatives are prescriptions for near-sightedness (can't see far away) also known as myopia. This happens when the eye is longer then normal from the front to the back. Postives are for far-sightedness (can't see up close), also known as hyperopia. This occurs when the eye is shorter than normal from front to back. The same symptoms of hyperopia occur in most aging people due to a inability of the aging eye to focus properly - a condition known as presbyopia. It is often confused with hyperopia because the first symptoms are blurry vision up close, but the two conditions have different causes, and presbyopia worsens to include blurry vision at all distances. Presbyopia is believed to be caused by a loss of flexibilty in the lens of the eye over time. \n\nAstigmatism is caused by an irregularly shaped cornea or lens, and causes blurred vision as well. Please refer to the site listed if you would like to know more.
31226
Okie... here's something that might help! U have unexplained headaches, you cant read those advert banners from far/ the blackboard in class from the last bench, your eyes get runny and itchy when youre trying to focus on a distant object, far away lights at night seem blurry and not pin points. If the answer to ANY of the above is YES.... its time to visit your friendly neighborhood Optometrist/ Ophthalmologist :) and btw... spectacles can make you look CUTE!
424724
Different glasses\n\nand would guess Endora
155476
what is the relationship between the relative angles of polariztion of two polarized lenses and the degree to which they obstruct light ?
373710
See if these fit\n\n1) bright field\n\n2) cilia\n\n3) contrast? = staining
345598
eye = light \nears = sound\nnose = chemical
628059
Haha...yeah! I go to the doctors, and they say I have 20-20 vision...but I know for a fact, that when I look at things far away...they are somewhat blurry. My right eye is worse than my left. So I finally went to the doctor. And without straining I tried to guess the letters. I got one wrong and the guy was like..ooo! You need glasses! So I got a prescription with only the right eye...like, there are lenses, but only the right one helps me see better...if that makes sense. So yeah...I have glasses, but I don't use them.
196520
General thought about looking directly at very bright light is correct. The lens of our eyes can project a many fold brighter image on the retina. This can damage the rods and cones in your retina and can even cause permanent damage to your vision.
153031
(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.
175698
Just multiply the numbers.  positives will get a positive answer.  Odd number of negatives will get a negative answer.  Even number of negatives will get a positive answer.
487016
To remember what each sign means, look at it closely.  Notice how one side is smaller (lines come to a point) and the other side is bigger (lines spread apart).  The smaller side should point to the smaller number.  The bigger side should be with the bigger number:  You can also imagine the < looks a little like an L for "less than".\n\nFor example:\n\nTwo is less than four:\n2 < 4\n\nFour is greater than two:\n4 > 2\n\nFor multiplication and division of negative numbers, just remember the rule of double negatives.  If you have one negative, the statement is negative.  But if you have *two* negatives it becomes positive.\n\nThis works for English too.  If you tell me to NOT go to the movies, but I say I am NOT going to listen to you.  That means I *am* going to the movies.\n\nSimilarly if you multiply -2 x -3, the answer is +6.\nOr if you divide -10 / - 2, the answer is +5.\n\nJust remember the double negatives rule.  NOT 2 times NOT 3 = YES 6.\n\nAnd if you have more numbers to multiply of divide, just count the number of negative signs.  Every time you have 2 they cancel.  So if you have an even number, the answer is positive.  If you have an odd number, the answer is negative.\n\nFor example:\n-2 x -2 x -2 x -2 = +16 (four negatives, make a positive)\n-2 x -2 x -2 = -8 (three negatives, stay negative)\n-2 x -2 x +6 = +24 (two negatives, make a positive)\netc.\n\nFor addition, the answer depends on the numbers.  If the bigger number is positive, the answer is positive.  If the bigger number is negative, the answer is negative.\n\nYou subtract and use the sign of the bigger number:\n\n8 + (-6) = 2 (bigger number is positive)\n8 + (-13) = -5 (bigger number is negative)\n(-4) + 7 = 3 (bigger number is positive)\n(-4) + 1 = -3 (bigger number is negative)
222147
ok, well think about what the resolving power means, first.  \n\nit says that if you take 2 point-like objects, and bring them closer and closer together, then your eye (or some optical instrument) will have a lower limit in terms of seeing them as 2 individual objects.  at some distance apart from one another, they will simply blur together and look like a single object or blobby thing.\n\nnow obviously, if the 2 objects are closer to your eye, then you can see them better, so the "distance between objects" is maybe not a very good way of determining your resolving power, because it depends on where the objects are.\n\na distance-independent way of stating the resolving power is in terms of the ANGLE between the objects.  this is the angle formed by the line that goes from object 1 to your eye, and the line that goes from object 2 to your eye.  for any given eye, there is some angular separation between 2 objects below which distinct objects cannot be resolved.  this angle is called the resolving power.  (radians are just a unit of angle, like degrees.  there are 2 * pi = 6.28 radians all the way around a circle.) \n\nso, if you think about it, someone with sharper vision can resolve 2 point-like objects that are closer together than can someone with poor vision.  this corresponds to a *smaller* angle because they're closer together.  so a small value for resolving power corresponds to sharp eyesight.\n\nas for optical or visual acuity, that is simply the reciprocal of the resolving power.  that means that a *larger* value means sharper eyesight.  in a medical context, visual acuity is usually expressed as something like 20/10 (which equals 2) for very good eyesight or 20/100 (which equals 0.2) for poor eyesight.  as you can see, the larger the value, the better the eyesight.\n\nhope this helps!\n\nps - have a look at this website if you need more info:\nhttp://www.tedmontgomery.com/the_eye/acuity.html
184421
Personally, I like the policeman comment, but okay.  Try this approach--if you were the budisatha (bodhisattva?), and if I were to humbly walk up to you, then which two eyes would you see my approach with?\n\nIf you see something, you see something; but if you're examining eyes--you're an optometrist!  \n\nWhich two eyes are right? The two eyes the bodhisattva sees out of, of course!  How do you know which two he sees out of?  You must be the bodhisattva, of course!  How does one become the bodhisattva...?  \n\nA good start is, when seeing--see, when sitting--sit, do in the moment only that which is "of" the moment (not that you could do anything else, but it never hurts to try)...and all other things resolve themselves.  It is in that moment of resolution where appear: The two eyes of the bodhisattva!\n\nNote:  If you notice their appearance--they will vanish before your eyes (bad)!  That is, unless, you have truly noticed their appearance, in which case they will truly vanish before your eyes (good).\n\n-S
45620
Carrots, onions, and other vegetables will not decrease your need for glasses.  The See Clearly method also will not work.  If you are nearsighted, it means that your eye is either too long or too strong, so that it focuses light in front of your retina instead of exactly on it.  If you are farsighted, it means that your eye is either too short or too weak so that it focuses light behind your retina.  The only way to correct this is by using lenses or by re-shaping the front of your eye (the cornea).\n\nYou say that you don't want to wear glasses.  Have you considered contacts?  You could also consider LASIK or a temporary, reversible procedure called Orthokeratology (Ortho-K).  Ortho-K uses gas permeable contact lenses to temporarily re-shape your cornea while you sleep so that you don't need to wear glasses or contacts during the day.  Not everyone is a good candidate for all of these options, so talk to your eye doctor about what would work the best for you.
403258
not at all ur specialist wud give different numbered glass for diff eyes thts particular numbered glass for ur left eye n particular other no of glass for ur right eye...... once the perfect numbered glass is fitted in ur glasses n u wear them ur eyes wont look small or big coz each  eye wud be given the type of glass according to its own power......
199493
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.
629633
You can really only see images that are focused onto a small little center on the back of your eyeball.  When your lens becomes distorted, the light is reflected onto the wrong area.  Normally all light converges on this area and you see 1 image.  The images you are seeing are overlapping and appear blurry to you.