#human eye

[wisdomfish]

Human eyes cannot see many critically important things that are undoubtedly true.

Samples, Kenneth Richard. ‘Without a Doubt: Answering the 20 Toughest Faith Questions.; p. 40

[2022dirt]

Eye freckles are small dark spots on the colored part of the eye. They’re usually harmless and form when clusters of pigment cells accumulate, often due to sun exposure.

[csmsdust]

[protography0]

[sources: x / x ]

"Almost Familiar" (Annihilation)

Digital collage made in GIMP with stock images from Pexels.com. Based on a scene in the book "Annihilation", part of the "Southern Reach" triology-soon-to-be-tetralogy by Jeff Vandermeer.

I was kinda thrilled that making collages enabled me to re-create this specific scene from the book, even if this piece looks and feels just as eerie to me as reading the scene did. This was more of a quick one, but I still like it very much.

I have made a few other collages that dip into the same uncanny metamorphosis-type entities and imagery as this one that I will hopefully post soon as well.

[sheltiechicago]

The Human Eye

gtasean

[fallensapphires]

Eyes: Blue

Blue eyes up close are a celestial phenomenon.

[weneverlearn]

Don't know how I missed this lil' tidbit, from 2023.

If you haven't dug into the long sonic severity of anything Timmy Vulgar-related, get on it pal!

[weherzit]

[lucidsouldynamics]

Coincidence? I think not!

[absolute-weirdo-inc]

my art gcse homework lol x

[responsivethoughts]

The iris from the human eye.

[amiralibanani]

All About The Human Eye!

The eye is our most complex sensory organ. It consists of versatile structures such as the lens and iris that allow regulated amounts of light from varying distances to be focused on the retina – which converts the light into signals that are sent to the brain to be processed.

The main parts of the human eye represented on a cross-section illustrated transversally.

The cells of the retina, divided into 3 primary layers (from innermost to outermost):

Photoreceptor cell layer (rods and cones)

Bipolar cell layer (bipolar and horizontal cells)

Ganglion cell layer (ganglion and amacrine cells)

In the retina, there are 1.2 million ganglion cells, 6 million cones, and 120 rods spread across 10 layers of cells and 6 unique cell lines that work to convert light energy into electrical signals. These signals are gathered from all the cells and transmitted to the visual cortex inside the brain's occipital lobe via the optic nerve.

Light that enters our eyes from the left side of our visual field is processed in the right hemisphere of the brain while the light that enters our eyes from the right side of our visual field is processed in the brain's left hemisphere. This 'crisscrossing of visual fields', which takes place at the optic chiasma, results in a flipped image – which the brain automatically corrects.

[entropy-sea-system]

Human Eye Pigments and also a tangent on Oil Droplets Found in Photoreceptor Cells In Birds' Eyes

ok so. pigments in the iris of the human eye!! Lipochrome is also called lipofuschin and its a carotenoid pigment!!

This infographic does not have grey eyes but grey eyes are basically due to irises that have very little melanin and have more coarse collagen in the stroma of the iris and this causes the light to reflect in a way that makes the iris appear grey

This image explains what colors get scattered by the stroma and the resultant eye color.

Now about the birds..

I also remembered that birds have some carotenoid pigments in their eyes. Those are in the form of oil droplets too in some birds (they apparently have the same visual pigments as humans which are rhodopsins - which is formed after vitamin A or retinol undergoes a cycle known as Wald's visual cycle).

And this image above shows where the oil droplet is present in the cone cell(cone cells are responsible for color vision and daytime vision). These oil droplets are also found in rod cells occasionally(rod cells are for night vision/low light and black and white vision) but not as often, so these oil droplets play more of a role in diurnal species.

So they have visual pigments but in addition to that, some birds eyes have oil droplets containing carotenoid pigments in front of cone cells that act as spectral filters, like spherical microlenses, and help channel light. These oil droplets are also found in some reptiles, fish, and amphibians, and were actually first studied in turtles!

(links for further reading below!)

This one is a research article from 2014, its open access so not behind a paywall.

This is a science news article from Purdue about a type of retinal structure that contains megamitochondria(a structure producing energy) and oil droplets (MMOD or megamitochondria-oil droplet complex) that was discovered in flycatchers(a type of passerine, or songbird) in 2019.

This study was done on new world flycatchers (various species of the Empidonax genus, specifically). A flycatcher is a 'sit-and-wait' predator of insects(what says on the tin- the bird waits on a branch and catches insects when it sees them) and this eye structure enables precise visual tracking. And below is the link to the study itself which is also open access.

[linpunny]

This is literally how I look anytime I get an ask reblog or follow

reblog if your inbox is always open for new members of the fandom who may be a little shy or intimidated. doesn’t matter whether or not you’re a “popular blog”; everyone here is equal and if you’re reading this as a new person/someone considering entering the fandom, we will not turn you away!!!! talk to us!! make friends!! i more than understand being shy but trust me this fandom is chill come join us in this hellhole

[texaschainsawmascara]

links to the donations mentioned

https://unrwa.org/

https://www.instagram.com/gazamutualaid

https://campusbailfunds.com

[couldnt-think-of-a-funny-name]

I think we're too harsh on medieval painters because this is legitimately what some poodle mixes look like