Round Black Eye Floaters

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 Color Is A Mirror

Hey, Vsauce. Michael here.And today we are going to talk about color. (Green Green, Green Green).quot;Goldquot; on, let me just quot;Pinkquot; this up. quot;Yellowéquot; quot;Michael, quot;Orangequot; you going to come to theconcert this eveningéquot; quot;I quot;Redquot; about that, there are going to bea lot of quot;Purplequot; there.quot; quot;I didn't quot;Tealquot; you about this earlieréquot; quot;Well, look, I have to go quot;Brownquot; town first,but I'll be quot;White Black.quot; Colors.

Did you know that the human eye can differentiate10 million different colorsé But what color is a mirroré You might say quot;silver,quot; because mirrors areoften illustrated that way, and, to be sure, they are made out of silver or silvery thingslike aluminium. But a mirror, in reality, is whatever color you point it at. In this Green Room, the mirror is green. Andif you look inside a mirror, it becomes quot;youcolored.quot; An object is whatever color it doesn't absorb.These sticky notes are orange because when hit with typical white light, they absorbevery other wavelength of visible light, except

for orange, which they diffuse into your eye balls. But a perfect mirror reflects all colors equally.So, in a way, you could say that a mirror is white, except a mirror doesn't reflectcolors in the same way that pigment does. A mirror reflects incoming light in a singleoutgoing direction specular reflection, not diffuse. This kind of reflection creates animage of the very thing in front of the mirror. So, as Bad Astronomy jokes,a mirror is more of a quot;smart white.quot; But wait a second, that is a quot;perfectquot; mirrorand we live in the real world where there are no perfect mirrors. Every mirror absorbsa little bit of light, not enough that it

matters, I mean, it looks pretty clear tome, but when you take a look at the spectrum of light reflected by a typical mirror, youwill find that it best reflects light within the 510 nanometer range, which we perceiveas green light. So, technically, a mirror is a tiny, tiny, tiny bit green. You may have noticed this yourselfwhen investigating a quot;Mirror Tunnel.quot; This happens when two mirrors face each other,reflecting the same scene back and forth, and back and forth, and back and forth. Witheach new reflection, a little bit more visual light is lost, but green least of all. That'swhy the reflection way down the tunnel is

dimmer and greener. So maybe real world mirrors aren't quot;smartwhite,quot; they're actually kind of green, but we should talk about white. quot;En español, quot;whitequot; es quot;blanco.quot; quot;En français, quot;whitequot; est dit quot;blanc.quot; And in English we have a word that comesfrom the same route. Black, which is the opposite of white. How did that happené Well, it turns out that all of those wordscome from the same ancient ProtoIndoEuropean

root word quot;Bhleg,quot; which meant quot;shine,quot; quot;burn,quot;quot;flash.quot; Some languages took it to mean the brightness of the flash: quot;white.quot; While otherstook it to mean what's left behind: the burned, quot;black,quot; darkness. If you have blue eyes, your eyes aren't actuallyblue, in the sense that the molecules inside them are absorbing all other wavelengths ofvisible light and diffusing the blue. No, no, no, instead, your eyes are blue for thesame reason that the sky is blue: interference. In our sky, light from the Sun encountersmolecules of air and because of the size of those molecules, light of longer wavelengthscan slip on by, but shorter wavelengths crash

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