#human eye | Explore Tumblr Posts and Blogs

wisdomfish · 7 months

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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

#humanity #human eye #eyesight #critical theory #tru

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csmsdust · 5 months

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#human eye #squid eye #blind spot #evolution

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sheltiechicago · 4 months

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The Human Eye

gtasean

#gtasean #photographer #human eye #fact

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weneverlearn · 8 days

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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!

youtube

vimeo

#clone defects #human eye #timmy's organism #detroitpunk #Timmy Vulgar #punk rock #garage rock #space rock #epileptix #Youtube #Vimeo

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ilikeit-art · 2 years

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#human eye #eyesight check #new technology #self measuring

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lucidsouldynamics · 6 months

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Coincidence? I think not!

#universe #spiritualguidance #spiritualawakening #witchyvibes #witchythings #love #art #nebula #death of a star #human eye #birth of a cell #brain cells

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absolute-weirdo-inc · 7 months

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my art gcse homework lol x

#my art #human anatomy #human eye #human nose #human ear #human lips #pencil art #homework #art gcse

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albertayebisackey · 2 years

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Wednesday 12th October 2022 - Anybody who knows me... when I'm tired, I sleep with my eyes open.- John Daly

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amiralibanani · 1 year

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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.

#human eye #opthalmology #optics #optical #brain #neurology #vision #ophthalmic #medicine #health #biology

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entropy-sea-system · 1 year

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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.

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palirev-web · 2 months

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Inspired by this post by @alex-just-vibing. PaliRev values the contribution of all people to the liberation of Palestine, and we encourage you to share this around your schools or with others to give accessible options for us all to show solidarity for the Palestinian people.

[image id: an image with a white background, bordered on the bottom left and top right with green, corner illustrations, an olive garden branch drawing on the bottom right, and a drawing of a boy sitting down with a backpack leaning on him, looking downwards sadly on the top right. there is a low opacity palestinian flag behind black text reading "HOW DO I SUPPORT PALESTINIAN RESISTANCE IF I CAN'T DONATE?" below this is a list in smaller black text, bulleted with light green arrows. the list reads:

"- Wear shirts, pins, keffiyehs, anything outwardly pro Palestine.

Email your Representatives, Congress, White House. Tell the people in charge you want a ceasefire.

Talk to your local library about holding an educational night about the genocide and/or Palestinian culture.

Make schoolwork about Palestine! Writing about news? Focus on Palestine. Making questions for a test? Use Palestine as an example.

Find social media accounts for your representatives and schools, and make a fuss. Comment and @ them!

Show up to local actions (i.e. protests), join and organization, and follow Palestinian journalists! (next line) - Motaz Azaiza, Plestia Alaqad, Hind Khoudary, Bisan Owda -

Educate yourself on anti-Palestine talking points (Palestine toolkit) and how to refute them in a calm manner.

Speak up! It's scary, but don't let other people's bigotry go unchecked. You'll find that other people agree, and speak up from your example.

Don't engage with people unwilling to learn. Your goal is to educate people who are and make those comfortable with genocide feel UNCOMFORTABLE."

below this in light grey text reads "@PALIREV.WEB". /end id.]

#palestine #free palestine #eyes on gaza #eyes on palestine #gaza #free gaza #infographic #PaliRev #student #solidarity #current events #activism #protest #human rights

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embraceyourdestiny · 6 months

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to any americans who feel "paralyzed" and "dont know what to do" to help with gaza:

reading a fucking book. i beg of you.

in a time of knowledge suppression is it your duty to arm yourself with knowledge.

read about americas occupations in the middle east.

read about 9/11 from outside of america and see how they inflicted senseless harm and violence to countless amounts of people and have been suppressing your rights for the past 2 fucking decades.

read about any of the countless wars from the past 30 years. especially from a civilian's. and the victims and survivors' perspective. listen to the horror stories and do not plug your fucking ears as to what your country is doing.

and read about fucking gaza and palestine and keep up with what is happening no matter how "sad" or "uncountable" you might get.

dont look away from this.

you dont have the right to be comfortable during countless active genocides.

if you're knowledgeable, you're powerful, and our current state doesnt fucking want that.

you have the power to change things if you open your eyes and scream to the world.

wake the fuck up.

Edit: please check the reblogs there are readings and ways to help

#og #truly if youre not about it your against it and i dont fuck with you because you're complacent #wake the fuck up #we're all responsible and dont you dare say you're not #americans need to stop living in the world with their eyes closed and their ears covered #look at what your fucking 'glorious country' is doing to people #everyone should be against america no fucking exceptions because america is violent and evil and needs to be stopped #then read about what america has done to the natives of their land #radicalize yourself #decolonize your mind #free palestine #land back #palestine will be free #theres too many fucking movements of just the past couple years all happening at once to act like the world is fucking fine #we are in a human rights CRISIS #WAKE THE FUCK UP PLEASE

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intersectionalpraxis · 3 months

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48 million people in Sudan still can not contact their families across the diaspora. They're cut off from the internet, which includes their online banking services as well. Thousands of displaced Sudanese people were also recently turned away as asylum seekers: