Vision Definition and 125 Threads

Homework Statement: From a description of the photo below, the woman on the left is actually taller than the boy on the right. Relevant Equations: This is a so-called "Ames room" and has been constructed to eliminate the usual monocular depth cues that our eyes use to determine distance based...

So, non-quartz sand has 1/2 mm kernels, they can be seen as individual objects from about 60cm distance. Standing in front of it, about a half of the individual sand kernels beam each separately into your pupil, so 500,000 discrete beams, each covers almost the entire pupil. Yet, you see a...

Bear with me this will be long, but everything here I feel is necessary to understand the context. I recently used a crt at varying refresh rates and noticed a few things that has made me question how the brain perceives colors on a display. First, is that my crt appears to have more color...

Here's something different: I just heard a podcast about recent biological research. Fly are insects (arhtropods) with an exoskeleton. An exoskeleton cuticle covers are the exposed surface areas of their equivalent of skin cells. The cuticle is usually stiff and hard (to resist mechanical...

The measurement for astigmatism is diopter. But what does 1 diopter of astigmatism mean? Thanks a lot if you help me figure this out!

Let me start off with saying I am just a idiot with a high school level education (and a learning disability ). But i have a idea of using a diverter with a plasma actuator equiped, to generate a stream of negatively charged electrons to attract spent alpha particles and impurities. Tuned to...

Hello Everyone, I have a thermal imager and I am interested in better understanding night vision (NV) technology. Apparently, NV goggles respond to NIR and SW See this article. NV goggles can see from the near infrared (NIR) to the shortwave infrared (SWIR) portions of the light spectrum. Do...

While glancing through an ophthalmology textbook several years ago, I learned that the transition between the two forms of rhodopsin (that results in neural activation and, ultimately, vision) can be accomplished through the electromagnetic energy provided by certain radio wave frequencies (and...

You can not see 1 grain of sand from 238,900. miles away with the naked eye so why can we see the moon it is billions of grains of sand? We can not see 1 germ with the naked eye, can we see 1 teaspoon of pure 100% germs?

I'm trying to perform depth estimation on stereo vision using live feed. I'm using two webcams. The code below doesn't give any error but I only get a block box without any sign of live video! Could you please give it a look? leftCam = imaq.VideoDevice('winvideo', 1, 'MJPG_320x240')...

I am a computer science graduate working in computer vision , remote sensing field for a private company. Been studying physics on my own for curiosity(A levels, H&R books, feynman essentials) . I developed interest in physics few years back and I have been searching for ways to convert my...

Hi Physics friends. Quick Question at a very, very basic level regarding vision. It’s so basic that it needs to be checked out to make sure I’m distilling it properly. Can I do it like this? “At a very basic level, we see an object because light reflects off of it and hits our eyes. The darker...

Is most of human vision processing performed in a linear step-by-step fashion in the brain or is it concurrent? Let's take for example; for the process of us recognising a pen on a table. Light/information enters the eye, is focused on the fovea part of the retina because we are focusing on...

Do Rod photo-sensitive cells contribute at all to daytime vision? If so, what exactly do they contribute? For example, they contribute towards big homogenous shapes, slow moving big objects, etc. I'm interested in whether this applies to any animal not just humans.

In a story I’m working on, the antagonists are (humanoid--almost identical to humans) aliens, with 2 eyes, binocular vision. Their tech and bio-engineering is several hundred years advanced from ours. They can see the (human) visual spectrum, but also into the infrared (how far I haven’t...

I ran across an interesting little article in a trade mag e-newsletter. I tracked down the original research article, which is sadly pay-walled-in. Color vision depends upon having different photoreceptors that maximally respond to different light frequencies. The brain then recombines the...

I'm not sure where this thread belongs; it is essentially a topic at the intersection between quantum optics, human physiology and even psychology, but I will focus more or less on the implications for quantum physics, so I just opted for this subforum. There is a recent article over Scientific...

I just googled to see if this was a known thing and saw there was a closed topic on the subject. Usually I like to think of myself as a creature of logic and love to point out when other people distort reality to support their emotions but now I am all alone and trippin' about what follows. For...

So I read a couple of explanations of how night-vision equipment works. Unfortunately I don't remember the sources but my recollection/understanding is that infrared light is converted into electrons and then into visible light. So my question is how does the information by which I mean (the...

The new Predator movie is coming out soon. I just watched part 1 to 3, and this weekend the Predator vs Alien (part 4 and 5). And there is one thing that is not certain. Do the Predator Aliens have normal vision? In part 1.. it seems to see all red and has such low resolution it can't see...

As per Wikipedia, there are three types of cone cells. Quoting Wikipedia: I searched a bit more, and found that there are three different types of iodopsin pigment in these cells. Quoting Wikipedia again: Can you say what reaction occurs for each of the pigments when they are exposed to...

Abstract: The restoration of light response with complex spatiotemporal features in retinal degenerative diseases towards retinal prosthesis has proven to be a considerable challenge over the past decades. Herein, inspired by the structure and function of photoreceptors in retinas, we develop...

I am interested to know how does thermal night vision works. Can anyone explain that to me, I would be thankful. I want to see the physics perspective on this.

First let me tell you the context: There was this recently discovered tiny sealstone depicting warriors in battle measuring only 1.4 inches across. This piece contains incredible detail that modern human eye cannot discern without a mechanical aid. Read more at...

If I am walking on a sunny day, looking mostly straight ahead, and the Sun is close to straight ahead but elevated 30 to 45 degrees so I'm not looking directly at it, is there a risk of vision damage?

I intend to finish my bachelor in Computer Science 3 years from now, by which time I will be 24 years old. I'm very interested in technology and cutting edge fields like Computer Vision/Machine Learning, and I would like to work with something like that in the future. Not necessarily with...

I am not sure of the right group for my question.Medical seems like a place to start. ---- I am monocular with an advancing cataract and macular pucker. Glasses with a corrective plastic lens help me see somewhat better. A pair of tinted No IR UV shields in front of the glasses sharpens my...

What's the average aspect ratio of human vision as we perceive it?

Hi there, i want to know as much as possible about this situation. I want to know the angles of vision for a real image, where can one see the image, the location of our eye to see it. Which factors determine this angle Thank you so much :D I hope this isn't a dumb question, thanks.

Greetings to all, I realize that there is another "dead thread" about this subject (with a lot of interesting comments) but I think I can add a "new dimension" to the conversation.:smile: I have also put this question out on a few other Science Forums... The human eye is much like the lens of a...

Mentor note: Split the thread in two parts, the other part is here: When (and Why) Does a Human Baby's Vision "Flip". This thread discusses the inversion of human vision, "up/down", "left/right" and 180 degree rotations. Greetings to all, I realize that there is another "dead thread" about this...

please refer some live feed drone camera with infrared and night vision and good picture clarity in minimum price . thank you

Homework Statement - Why is it more useful to mark an objective lens [in a microscope] by its magnification rather than focal length? - Why might it be more convenient to think in terms of refractive power rather than focal length? [dealing with vision here] Homework Equations - thin lens...

When I try to imagine face of some persons like relative,friend, celebrities etc. I can visualize them in my mind. I wonder how do brain decide what to show to me in my mind about that person? I might have seen the person at his/her various ages, various dresses, various places. While...

Maybe this sounds mad, but does anyone think it would be possible to see wavelengths that are beyond visible light, maybe through genetic engineering or through other technology? There are many animals than can see infrared & UV. Wouldn't it be cool if we could see what radio waves look like?

I keep reading and hearing conflicting information. Some articles say that eating carrots to improve eyesight is a total myth. Others say that, yes, carrots really are a super food for eyes. The latter group says all that stuff about how beta-carotene creates vitamin A which improves the way...

We already know about echolocation, using the ears to sense objects and space around us (also dolphins, bats, whales and some birds are quite good at this).. But how about using a sensor on our tongue to input visual information. Here is a Scientific American article describing this technology...

what are the different kinds of input can be given to make a pose graph?

I understand the basics of how vision works, but correct me if I'm wrong at any point. Electromagnetic radiation is emitted from the sun as a byproduct of fusion, in the form of photons. These photons travel a vast distance at an incomprehensible speed, and bounce around the atmosphere a bit. A...

Hi I want to know whether DNA inside our brain neuron cells helps us process images of what we see through our eyes.

This happened to me a few years ago, probably starting in 2008. I'd be sitting at me computer or watching TV and suddenly something would shift my attention to a clock somewhere, either on the TV, on my computer, on my phone, or maybe even on some sort of clock related monitor in some public...

hi guys, i just read a passage about colors to our vision it is a fact that we see an apple being red because it reflects red and absorbs the rest of the colors so my question is, is it possible to change the amount of reflection and absorption of an object and hence we see it with a different...

http://www.xrite.com/online-color-test-challenge Lower the number the better. I wish computer monitors can be used to test for Tetrachromacy. To learn more about Tetrachromacy go here: http://nymag.com/scienceofus/2015/02/what-like-see-a-hundred-million-colors.html I seriously doubt I am a...

I know that the blind spot is formed because of the optic nerve leaving the eye ball. Consider this.. Now once your seeing through just one eye you are not able to identify a small region of your vision, so shouldn't it be just dark or black, rather you just see the surroundings as though...

This is something that i noticed.i.e., it happen to me, when i went to my teacher to ask him why it happens he actually didn't believe me, i guess maybe because he was a physics teacher! Consider a room with\ all the lights switched off, let their be a far off light source which is very weak...

http://www.nature.com/ncomms/2014/141223/ncomms6920/full/ncomms6920.html 'Mineralized rods and cones suggest colour vision in a 300 Myr-old fossil fish' Management version: This pushes back in time the probable confirmation of the existence color vision. Interesting point to note: Vertebrates...

Hello, I am an Electrical Engineering student at the University of Georgia and will have to give a presentation on my dream job. I have to give specifics on what I would need to know. If I could get some input or maybe a job application that states the requirements. I know Electrical...

I was looking up space age stuff and stumbled upon some guys blog; He put up a bunch of old science magazine covers from the '50s, 60s. For one, I wonder if people at that time actually believed our century, the 21st century, would really be like what they drew and dreamt of, and why it never...

Hello, 1) I am looking for numerical data behind plots like this one. 2) Also, any information on the experiments the data comes from would be helpful. Are cone cells directly measured, or does it involve a human matching colors to a pure color light source? 3) Will I be able to write a...

I feel stupid mentioning it, but I think this happens to everyone and I'm curious if there is a name for this...sometimes when I'm concentrating on an engaging science problem I will lose awareness of what I'm looking at. I suppose its like a daydream but focused on a problem rather than...