First let's define vision:
Vision refers to the ability to see and recognize with the eyes.
In human vision, the field of view is composed of two monocular field of views that our brains stitch together to form a binocular field of view. It is in the central area where both eyes see together.
How wide is the viewing angle of human vision
The overlapping field of vision of human eyes is around 124 degrees, and the comfortable field of vision of one eye is 60 degrees.
As far as the human visual range is concerned, within 10° is the sharp vision area, that is, the central field of view, which is very sensitive to the color and details of the image.
It can correctly identify graphics and other information within 20°, the effective field of view. From 20° to 30°, although the visual acuity and color discrimination ability begin to decrease, it is more sensitive to activity information, and in the vision beyond 30°, the drop is very low.
So, the viewing angle of human eyes is approximately 135 degrees vertically and 200 degrees horizontally. It includes the vision of two eyes with a horizontal binocular field of view of about 120 degrees.
What resolution does the human eye see?
The maximum resolution of our vision is 576 megapixels.
576 million pixels seems to be huge, but in fact, there are already many mobile phone screens whose display capability exceeds the resolution limit of the human eye. Within normal reading distance, the pixel density on the mobile phone screen is very high.
Source: Paulo Schor, an ophthalmologist at Unifesp (Calculation was based on a viewing angle of 120 degrees).
Just as a comparison a 8K is 33 megapixels. So in the future there may be no need for higher resolution TVs as we may not be able to see the difference.
Tip: Turn on the caption button if you need it. Choose “automatic translation” in the settings button, if you are not familiar to the english language. You may need to click on the language of the video first before your favorite language becomes available for translation.
Note: The resolution of the human eye is determined by the distance between the visual cells on the retina. There are about 6 million cone or light-sensitive cells in each retina and between 90 and 126 million rods, the cells responsible for vision in low light conditions.
If you are interested in the details of the eye check this video:
Refresh rate
Some experts say the human eye can see 30 to 60 frames per second. Most agree that it is practically impossible for the human eye to perceive more than 60 frames per second.
How wide is the field of view of human binocular vision?
Humans have horizontal binocular vision of approximately 114 degrees, with the central 5% being the field of greatest acuity visual field.
There is no binocular vision in the remaining 40 degrees on either side (because only one eye can see that part of the field of view).
What is the maximum angle a human eye can see?
The maximum angle a human eye can see is 150 degree.
By two eyes we can see 180 degree .
Most of that field is what's called a Cyclopean image, the single mental picture that a Cyclops might see.
But that single image, created by two eyes, has both range and depth.
How far can human sight reach?
The human eye can actually see pretty far.
On a global scale, you can see up to about 5 kilometers before the horizon becomes the limit because of the earth’s curvature.
From a high vantage point, like a skyscraper, plane or mountain top, your eyes can see objects hundreds of miles away.
But that also should take into account the many factors that affect eyesight, as well as other considerations such as eye health, lighting, visual obstacles, etc.
In eye tests, a person with normal vision should be able to read a word with 7 mm2 letters at a distance of 6 meters.
So how far do you see?
Well, the photopic distance is 25cm. Anything beyond 4km is not easy to see.
When the distance is greater than 500m, you may get a blurred image of the object.
If need to identify flowers and trees, you should be less than 100m from it.
A question to you...
Do you think the human eyesight will improve beyond that?
Video: Testing the limits of human vision...
Youtube has a related video on this topic: “Testing the limits of human vision...”
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