Posts Tagged ‘eye’

Camera App and Attachment Turns Any Smartphone Into an Eye Exam Lab On-The-Go

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Smartphones have revolutionized the way we go about our everyday lives. And while more often than not they’re used for more trivial tasks, there are times where their ubiquity and decreasing costs play a vital role in far more meaningful endeavors.

One such case is Peek Retina, a smartphone camera adapter and accompanying app that enables anyone with the know-how to perform an extensive eye exam on anyone… anywhere. The humanitarian potential is obvious.

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Dietary Experiment Claims to Successfully Extend Human Vision Into Near Infrared

Update: Since we published this, a reader and retinal neuroscientist wrote up a rebuttal, explaining why this couldn’t possibly work in humans. Click here to read his full explanation.


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Mind = Blown. A camera sensor might fall short of the human eye in a lot of respects, but one area where it exceeds it is infrared. The sensor can see it (sometimes with a little bit of help), but humans can’t… or can they?

A crowd-funded experiment maintains that they can, given a little bit of dietary help. And they just got their first positive results, successfully extending human vision to 950nm! Read more…

This is the First Photo Taken with the Sony Curved Sensor

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Released in an article earlier today, what you see above is the first photograph taken with Sony’s revolutionary curved sensor. And while you can’t really tell much about the quality or any other specifics about the sensor from it, it’s still exciting to see that this tech isn’t just schematics on a piece of paper — it’s real and it works. Read more…

Answering the Unanswerable: What is the Resolution of the Human Eye?

What is the resolution of the human eye? You might think it’s a straight forward question with a straight forward answer. We have a certain number of photon collecting cells in our retina much like an image sensor right? So we should be able to pull a ‘megapixel’ count of sorts out of there.

Well, actually, it’s not nearly that simple. And in the video above, video blogger Michael Stevens (aka. Vsauce) explains why, before ultimately answering the question anyway. Read more…

Stunning Macro Photographs of Animal Eyes

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They say beauty is in the eye of the beholder, but in the case of Suren Manvelyan‘s macro photography, it’s just in the eye. After his extreme close-up photos of both human and animal eyes went viral one right after the other, Manvelyan decided to continue seeking out more beauty in the eyes of animals by releasing a part two to the amazing series we shared with you back in 2011. Read more…

The Great Compositions of Photographer Alfred Eisenstaedt

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Has someone ever asked you why you like an image? Beneath the surface of great picture, there is a geometric design in hiding. During World War II, photographer Alfred Eisenstaedt worked for the early version of the Associated Press and went on to become a Life Magazine photographer, taking over fifty cover shots for them. Without getting too deep into Eisenstaedt’s personal story, I will say that he started photography with very little formal training.
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Rumor: Sony May Introduce Eye-Tracking Autofocus Next Year

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Want to focus your camera simply by looking at a particular area of the viewfinder? If you’re a Sony shooter, you might be enjoying that feature as early as next year. The company is reportedly working on building Eye Tracking autofocus into its cameras, with the initial version arriving in a flagship camera sometime in 2014.
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The Camera Versus the Human Eye

This article started after I followed an online discussion about whether a 35mm or a 50mm lens on a full frame camera gives the equivalent field of view to normal human vision. This particular discussion immediately delved into the optical physics of the eye as a camera and lens — an understandable comparison since the eye consists of a front element (the cornea), an aperture ring (the iris and pupil), a lens, and a sensor (the retina).

Despite all the impressive mathematics thrown back and forth regarding the optical physics of the eyeball, the discussion didn’t quite seem to make sense logically, so I did a lot of reading of my own on the topic.
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Iris: A Concept Camera That’s Controlled Using Your Eye

Using the human eye to control cameras isn’t a new idea — Canon used to offer eye-controlled focusing in its SLRs — but designer Mimi Zou‘s Iris concept camera takes the concept one step further by having the camera be entirely controlled by the eye. Shaped like a lens, the photographer uses the camera by simply looking through it. Focusing, zooming, and snapping photos are done by looking, narrowing/widening the eyes, and blinking (respectively).
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What’s the F-number of the Human Eye?

Ever wonder what the f-number of your eyes are? It can easily be calculated using the human eye’s focal length (~22mm) and physical aperture size. Here’s what Wikipedia has to say:

Computing the f-number of the human eye involves computing the physical aperture and focal length of the eye. The pupil can be as large as 6–7 mm wide open, which translates into the maximum physical aperture.

The f-number of the human eye varies from about f/8.3 in a very brightly lit place to about f/2.1 in the dark. The presented maximum f-number has been questioned, as it seems to only match the focal length that assumes outgoing light rays. According to the incoming rays of light (what we actually see), the focal length of the eye is a bit longer, resulting in minimum f-number of f/3.2.

The article also notes that the eye cannot be considered an ordinary air-filled camera since it’s filled with light refracting liquid.

F-number: Human Eye (via Reddit)


Image credit: eye 172/365 by attila acs