Vision Definition and 125 Threads

Hi, I am suffering from blurred vision and often have headaches. I fear it is some transient disorder, but it could be something more serious. Can someone suggest me as to what to do? Your suggestion would be highly appreciated. Thanks!

Persistence of Vision! If you wave a 5mm bright green led in a circle fast enough you see a green circle (say you attach it to a bike wheel and spin the wheel). What will the intensity of that green circle be? Will the light intensity be smeared throughout the whole circumference of the...

My textbook states that if something i am looking at disappears for 0.1 second and appear again, I'll not able to perceive that it was not there for some moments. When an object build an image in my brain, the sense of vision lasts for one-tenth of a second. Doesn't it imply that if any other...

1) How powerful is the human eye at discerning differences in light? (in a completely dark room could you make out one photon, how much light needs to emanate from a single point to be visable, how close of an angle must separate beams of light be projected in order to appear seamless to the...

What is the lowest intensity of light that generates any stimulus in the human eye? In what wave length range?

This is somewhat amusing if you have the time and lack of productive activity. http://sbrtna.blogspot.com/2006/02/how-to-give-yourself-temporary-night.html Enjoy!

when i look at something very very carefully, one side seems blue and the other seems redish(at the border). I was wondering if 1.Im crazy 2. Its a eye/lens/vision thing 3. physics at work! YEY!:smile: :smile:

I discovered this way people with Windows xp can turn everything on your screen into a beautiful, large, easy to read format. This will be of particular interest to those of us past 40 whose vision isn't what it used to be. Click Start->Control Panel->Acessibility Options->Display Here, put a...

Is it possible for one's vision to improve? I've read that myopia can be caused by excessive near work (e.g. reading). Would it be possible for a myope to improve his vision by straining his eyes looking at things in the distance for prolonged periods?

Our sun eminates electromagnetic radiation over an enormous range of frequencies. Radiation curves (energy@wavelength) resemble bell curves, and highly accurate measurements have shown that the peak of the sun's radiation curve is in the visible light range. This is not a coincidence, it is...

Hi all, I'm just curious what you see on these testimages: http://www.toledo-bend.com/colorblind/Ishihara.html http://en.wikipedia.org/wiki/Color_blindness When I was in school, our biology teacher asked us what we see and there were 2 out of 24 pupils who couldn't see the red 8. I...

Humans have full 4D spatial vision Consider this: 1) objects in motion show non-simultaneities along the direction of motion (the "temporal distance" between the endpoints is \gamma vl/c^2) 2) objects in motion show time dilation (the "temporal velocity" runs slow with a factor 1/\gamma)...

I'm not sure if this is the right forum for it, but I had a few questions about how color vision works. I know that mixtures of pure colors look like other pure colors. For example, some mixture of pure (monochromatic) green and blue looks like pure yellow. So for a given color, are there an...

How do people who can't see or hear.. use computers.. I know there must be some way for them to... but what is it?

I know it is used to refer to the property of brain/eye that it takes them one-tenth of a second to process a new image after processing one but I just can't figure out how does a movie camera takes advantage of it and fool our brain so that it thinks that its waching a smooth motion though i...

Two years ago I had a vision in which a vine streched to the sky. It was thin and yet it went straight up much like the beanstalk. It should have not been able to be that high and that thin defying physics and yet it did. I stepped back and so did my in law who was also part of the dream...

http://www.nature.com/news/2004/040719/full/040719-19.html

Has anyone found a connection with computers and bad eyesight? (sorry for being so vague .. but I am not able to exten my post at the moment)

After reading the reviews and seeing the promos, all I can say is that the "Good Dr." must be spinning in his grave! To make a movie based on his work that revolves around a plot by robots against humans is a slap to his face and memory. Dr. Asimov created the three laws of robotics for the...

A look at any image in photoshop reveals that everyday scenery consists of many pixels of different hues. Even in an image of the same basic colors, there appears to be hundreds of different hues of different brightness. However this great contrast is not apparent unless you zoom in on the...

I suppose this topic could go into the Politics forum, but I think the interested members are mostly here. So, what will Kerry's vision be? Here's a clue from Space.com... http://www.space.com/news/kerry_report_040616.html Reading between the lines, I get the impression that Kerry would...

Does anyone remember when Pravda only told the government's lies? I am posting this as a reminder that IMHO, Pravda is not a valid news source. http://english.pravda.ru/science/19/94/377/11797_phenomenon.html

Hello everybody. Making a search about magnetic propulsion systems using relativity speeds (and then time delays on fields), i found this VERY VERY INTERESTING internet page: http://members.dancris.com/~bfraser/4v4a/ADVPROP.html I recommend to read it as you would read "history of time"...

Experiment 1: Rotate your dominant leg clockwise and use your dominant hand to write the number 8 on a piece of paper. Do the same thing except rotate the other leg. What are the results and why? I kknow that its easier to do the second scenario but how can I explain it? All I can think...

There may have been other threads, wondering about the mystery of Venus. Or to sum up: http://solarsystem.nasa.gov/feature...enus/venus.html There seems to be some explaning to do here for the boldface. We have some tidal - gravity lock mechanism that may have caused that rotation stop, but...