why can nearsighted people see ditant ojects better through a pinhole?
439932
There is less for your eye to see, therefore, it has a better ability to foucus. The same thing is with concave/convex lenes if you want to look into it.
394062
It depends.  If you are nearsighted, glasses can make your eyes look smaller.  (The more nearsighted, the smaller the lenses make your eyes look.)  If you're farsighted, the glasses can make your eyes look bigger (like a magnifying glass).
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!
626305
Because you can read/see something better through a smaller hole. It's just like making a small circle with your index finger and thumb, if you look through it you can see a lot better!
212819
As dunnro said, it's the "aqueous humor." Look at the source link below to see if you can answer any other eye questions yourself - conserve your points and your homework time.
609119
The image is focused in front of retina, and you are near-sighted (MYOPIA).
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.
565800
I swear I saw a guy take his eyeball, still attached, out of it's socket, then put it back in. I would not reccomend it though, as if you mess up your retina, your eyesight is gone in that eye.
37469
There's optical aid.  You get to see out of your new corneas.
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.
307724
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.
918738
http://science.howstuffworks.com/question126.htm\n\n20/20 means that at 20 feet away, the person can see what a 'normal' person can see at 20 feet.  20/40 means that at 20 feet away, the person can see what a 'normal' person can see at 40 feet.  (Paraphrased from site.)\n\nNow:  not consulting the site anymore. . . .\n\nThe eye prescription is measuring something different, and you're missing part of it.  There should be minus signs or plus signs:\n\n-0.25 + 1.50 x 134\n\nThe first number is called the cylinder.  The second number is called the sphere, and the third number is called the axis.  If the first number is negative and the second number is positive, then the glasses are for a nearsighted person.  I'm not sure what the configuration is for a farsighted person.  My guess is that your friend is farsighted(?), or at least not very nearsighted at all.\n\nYou are trying to compare apples and oranges.  You need to know how well your friend sees on the 20/20 scale, or else you need to know your own eyeglass prescription in order to see who has the stronger prescription.  An optician told me that thicker glasses do not necessarily mean your vision is worse than the vision of someone else who does not have as strong a prescription as yours.\n\nThe defiinition of legal blindness includes the phrase "best corrected vision."  Neither of you seem to be anywhere near that threshold (20/200 in the better eye, best corrected vision).  But notice that visual acuity is measured on the 20/x scale and is not expressed in terms of sphere, cylinder or axis.  \n\nBy the way, my brother told me that the measurement for glasses (-13.75+0.75x010) is taken in diopters.  So if you're wondering minus 13.75 what, it's diopters.  And that was the prescription for my right eye at one time (I'm not sure what the latest prescription is).  The right eye is the worse eye, at least.  Oh, well.\n\nhttp://en.wikipedia.org/wiki/Diopter\n\nA dioptre, or diopter, is a measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in meters.\n\nAt any rate:  in order to make a fair comparison, you need to compare your prescription to your friend's prescription or your best corrected visual acuity to your friend's best corrected visual acuity.
1121044
It would lessen the amount of light that enters the eye. The lens must be completely clear, and blood vessels are opaque.
570309
behind the retina - farsighted (HYPEROPIA)
1117176
Probably because they want less distractions and can't see as much through peripherial vision when they are closer.
1133459
I'm gonna go with C.  if only because, as a young lad, I noticed that the image is clearest when your eye is the same distance from the lens as the object you are viewing.\n\nthen I discovered if you take it out in the sun, you can burn a hole in a piece of paper.  boys may be dumb, but we sure do have fun at things!  LOL
840084
I dont know much but i would like to help you....u can use lenses...and a liquid similar to the vitreous humor.\nBut its really interesting that u r trying to create a Working model of human eye. Good luck.