Question 1

what is the vision of a typical human eye?

Accepted Answer

Defined as 20/20: A normal human eye can resolve a certain standardized height and size of letters at 20 feet termed 20/20.  Some can see a little better and those with eye diseases may have this reduced

Question 2

do infrared (ir) cameras pose a risk to human eyes?

Accepted Answer

Tnfra red light: The amount of infra red light emitted by a camera has no ocular effect.

Question 3

is it possible that a human being have red or violet eyes ?

Accepted Answer

I guess: If you mean the white part of the eye, then yes. If the sclera, episclera or conjunctiva get sufficiently irritated or inflamed, they can look red--even violaceous. If you mean the colored part of the eye, well, i suppose it could if the eye was filled with blood (and even that would look closer to brown or black) or they had albinism (they would be pink from lack of pigment).

Question 4

what is the smallest point in which the naked human eye can see?

Accepted Answer

25-50 microns: With good contrast, you can distinguish about 50-100 microns without magnification at near.

Question 5

is something 10 angstroms in diameter large enough for the human eye to discern?

Accepted Answer

No: This is the size of some of the important individual biomolecules.

Question 6

what determines eye dominance in humans?

Accepted Answer

Unknown: About 2/3 of the population are right eye dominant versus 1/3 for left. A few individuals are codominant or neither eye is dominant. Eye dominance is not usually related to.

Question 7

what is the resolution of the human eye in pixels?

Accepted Answer

Not standardized: First you have to define the size of a pixel since this varies with the device because a pixel can be of different widths.  Photoreceptor packing is analogous to pixels and the resolution depends upon that packing.  Once you have decided which size pixels you are using for this, then you can look up photoreceptor size and compare them.

Question 8

woud you please discuss the chief optical defects of the human eye?

Accepted Answer

The optical system: Of the eye consists of the cornea and the lens.  The cornea provides about 2/3rds of the power of the system and the lens provides the rest.

Question 9

how long can a human keep their eyes open?

Accepted Answer

No limit: There are strong protective reflexes which cause blinking to protect the eye.  Given sufficient will power, someone might keep the eye open indefinitely - something done for religious reasons by some.  Be happy that your eyes blink to spread the tears and keep the eye healthy.

Question 10

how does astigmatism affect human eye ?

Accepted Answer

Blurs vision: Images are blurred with astigmatism.  You can think of astigmatism as a football on the surface of your eye.  You need the equivalent of a round basketball to see clearly.  Patients with astigmatism wear contacts or glasses shaped as a football in the opposite axis, thus neutralizing the astigmatism.

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Doctor answers about:

Human eye megapixel equivalent

A member asked:

What is the vision of a typical human eye?

A member asked:

Do infrared (ir) cameras pose a risk to human eyes?

A member asked:

Is it possible that a human being have red or violet eyes ?

A member asked:

What is the smallest point in which the naked human eye can see?

A member asked:

Is something 10 angstroms in diameter large enough for the human eye to discern?

A member asked:

What determines eye dominance in humans?

A member asked:

What is the resolution of the human eye in pixels?

A member asked:

Woud you please discuss the chief optical defects of the human eye?

A member asked:

How long can a human keep their eyes open?

A member asked:

How does astigmatism affect human eye ?

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