Spots In Eyes Can See

What are those floaty things in your eye Michael Mauser

Have you ever noticed something swimmingin your field of visioné It may look like a tiny wormor a transparent blob, and whenever you try to geta closer look, it disappears, only to reappearas soon as you shift your glance. But don't go rinsing out your eyes! What you are seeing is a common phenomenon known as a floater. The scientific name for these objectsis Muscae volitantes,

Latin for quot;flying flies,quot; and true to their name,they can be somewhat annoying. But they're not actually bugsor any kind of external objects at all. Rather, they exist inside your eyeball. Floaters may seem to be alive,since they move and change shape, but they are not alive. Floaters are tiny objectsthat cast shadows on the retina, the lightsensitive tissueat the back of your eye.

They might be bits of tissue, red blood cells, or clumps of protein. And because they're suspendedwithin the vitreous humor, the gellike liquidthat fills the inside of your eye, floaters drift alongwith your eye movements, and seem to bounce a littlewhen your eye stops. Floaters may be onlybarely distinguishable most of the time.

They become more visiblethe closer they are to the retina, just as holding your hand closerto a table with an overhead light will result in a moresharply defined shadow. And floaters are particularly noticeable when you are lookingat a uniform bright surface, like a blank computer screen, snow, or a clear sky,

where the consistency of the backgroundmakes them easier to distinguish. The brighter the light is,the more your pupil contracts. This has an effect similarto replacing a large diffuse light fixture with a single overhead light bulb, which also makesthe shadow appear clearer. There is another visual phenomenonthat looks similar to floaters but is in fact unrelated. If you've seen tiny dots of lightdarting about

when looking at a bright blue sky, you've experienced what is knownas the blue field entoptic phenomenon. In some ways,this is the opposite of seeing floaters. Here, you are not seeing shadows but little moving windowsletting light through to your retina. The windows are actually causedby white blood cells moving through the capillariesalong your retina's surface. These leukocytes can be so largethat they nearly fill a capillary

What Is The Resolution Of The Eye

Hey, Vsauce. Michael here. I am at the White House, in America's capital, Washington, D.C. America makes a lot offeature films every year Hollywood. But they don't make the mostfeature films every year. Nigeria makes more. But the country that makes the mostfilms every single year is India. Every two years, the country of India fills up enough film with uniquefeature films that stretch all the way from this city,Mumbai, to where I live,

in London. That's double what Hollywoodproduces in two years. That is a lot of movies, but is reallife a movieé I've discussed the framerate of the human eye before but how does the resolution of the human eye compare to a camera or screené VHS, LaserDisc, DVD, Bluray, IMAX. Numbers like these arepixel dimensions. When multiplied they tell us the total number of pictureelements an image is made up of.

A figure often used to describe digitalcameras. It might sound like more is better, but to be sure numberslike 1920 by 1080 are not resolutions per se.More pixels is only part of the equation. Resolution is about distinguishing fine details and that depends on a lot of other factors. For instance, the amount of light, thesize of the sensors, what the millions of pixels are actuallyencoding and how close the subject is. I mean, up close

Salvador Dali's painting of his wifelooking at the Mediterranean can be resolved into boxes. But from a far, well, it's Abraham Lincoln. For crying outloud, on a small enough screen from far enough away, low and high,socalled resolutions on screens, aren't even resolved differently from one another by your eye. How different nearby pixels are from oneanother also matters. This is called spatial resolution.

For instance, if I go outoffocus the number of pixels in the tutorial framestays the same but you can't resolve as much detail. Now, with all this in mind we can still compare human vision to a digital image,by asking a better question. Assuming everything else is optimal, howmany pixels would you need to make an image on a screen large enough to fillyour entire field of view look like real life, without anydetectable pixelationé Now we are getting somewhere.

Kind of. The analogy is still crudy because a camera snaps an entire frameat once, whereas our eyes move around. The brain amalgamates their constant stream of informationinto what we call vision sight. In fact, the image created by theeyeball alone during a single glance would hardly even be acceptable on abroken TV screen. We think our eyes create images like this pictureGuy took of me with a camera. But for one thing, unlike a camera,you've got some stuff

Leave a Reply