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Doctor insights on: Human Eye Color Chart

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How does the human eye work?

How does the human eye work?

Too complex: The answer to this question cannot be answered in 400 words that are allowed. You can read about it on the internet. ...Read more

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What are the parts of the human eye?

What are the parts of the human eye?

Parts of eyes: Great question: there are many parts: see http://eyedoc2020.blogspot. Com for best explanation & photos. ...Read more

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What is the vision of a typical human eye?

What is the vision of a typical human eye?

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 ...Read more

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

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

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

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

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

Violet maybe, no red: Iris can be many colors and some have a mixture of blue and other colors that look sort of violet - think of Elizabeth Taylor. Red is only possible if the iris surface is covered with blood vessels which is not normal but pathologic. Some advanced albinos have pink eyes. ...Read more

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

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

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

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Do infrared cameras like security cameras pose a risk to human eyes?

Do infrared cameras like security cameras pose a risk to human eyes?

No: Infrared cameras record light in the beyond red end of the visible spectrum. Fires, heat lamps and the sun put out far more infrared than such cameras and many of them emit no light at all but only record the image. It is the short wavelength end that is a problem such as uv light. ...Read more

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

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

Not even close: 10 angstroms = 1 nanometer. The smallest thing the human eye can see is about 0.1 mm which is 100, 000 nanometers or 1 million angstroms! Angstroms are really really small! ...Read more

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What is the function of iris for human eye?

What is the function of iris for human eye?

As an aperture: The main function of the iris is to regulate how much light enters the eye, much like the aperture of a camera. It also drains a small amount of aqueous humor, and likely has some other cellular functions that have not been well characterized. ...Read more

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What are the different aids to the human eye?

What are the different aids to the human eye?

Aids to the eye: Eyeglasses are the most common. Contact lenses are also popular. Other aids include magnifiers such as reading glasses, loupes and near telescopes. There are sophisticated electronic magnifiers as well. ...Read more

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What number of cones are present in the fovea of human eye?

What number of cones are present in the fovea of human eye?

About 5 million: I'm impressed that you know about retinal cones. The average number is about 5 million but up 6 million have been reported. As you probably know cones are for day vision and rods for night vision. The cones are clustered in the fovea so at night you see better looking a little off center. ...Read more

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How long can a human keep their eyes open?

How long can a human keep their eyes open?

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. ...Read more

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How does astigmatism affect human eye?

How does astigmatism affect human eye?

Blurred vision: Astigmatism is generally corrected with glasses and contact lenses. Otherwise is will simply cause vision to not be as clear as normal. ...Read more

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What determines eye dominance in humans?

What determines eye dominance in humans?

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. ...Read more

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What does the cornea do in the human eye?

What does the cornea do in the human eye?

Front window: The cornea is transparent and has refractive qualities. This means that it lets light into the eye, and modifies it by focusing so that you see well. It is the front window of the eye and also is a protective cover for the inside of the eye. ...Read more

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How can I learn more about the human eye?

Many sources: You can 'google' eye anatomy or eye function and get a lot of information. Most public libraries have books on the eye and of course medical libraries have whole shelves devoted to this topic. Your personal eye doctor can probably give to you or loan you some information and certainly can answer questions you may have. ...Read more

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How does enucleation of the human eye work?

How does enucleation of the human eye work?

Removal of the eye: The eye itself is separated from both the covering conjunctiva & 6 attached extraocular muscles. The optic nerve is severed & globe is removed from the orbit. A ball made of an inert porous material (like coral) is placed in the space & the muscles reattached to it. A peg on the front of ball snaps into prosthesis (glass eye molded later). Tissue is closed again. Plastic spacer placed btwn lids. ...Read more

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How can an enucleation of the human eye work?

How can an enucleation of the human eye work?

Surgical removal: Enucleation is a term to describe surgically removal of an eye ball. When a blind eye becomes intolerably painful, enucleation may be the only way to get complete relief. The surgery is carried out in the operating room. Patient usually is under general anesthesia. The eyeball is removed and the empty orbit is replaced with an implant. Patient later will be fitted with an prosthesis. ...Read more

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How many frames per second can a human eye see?

How many frames per second can a human eye see?

The eye: Will merge rapidly changing still images into motion. Generally less than 30 frames per second will result in a flicker when viewing, but this is highly dependent on the type of image, contrast, etc. ...Read more

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What is the resolution of the human eye in pixels?

What is the resolution of the human eye in pixels?

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. ...Read more

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

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. ...Read more

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How can the human eye accommodate for viewing very close and very distant objects?

How can the human eye accommodate for viewing very close and very distant objects?

Natural: The lens of the eye is connected to a muscle behind the iris is called the ciliary body. When the ciliary body contracts, the fibers connecting the lens called the zonules relax, & the lens fattens. When the ciliary body relaxes the fibers tighten & the lens flattens. This change in shape causes a change in the way light is bent through the lens and this changes the focusing for distance & near. ...Read more

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What are the chemical stimuli in the human body the eyes fingers etc (sense organs) or something else?

What are the chemical stimuli in the human body the eyes fingers etc (sense organs) or something else?

Neurochemicals: All sensory organs convert a stimulus (light, sound, heat, cold, touch, pressure, etc.) into an electrical signal which travels up the nerve for the body to respond to that stimulus. There are a variety of neurochemicals that are part of this relay including acetylcholine and epinephrine and many others. The specific one depends upon the circuit in question. ...Read more

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Can you explain human attraction between male and female? How can guys tell when women like them? I see females look my way, but eyes don't talk.

Can you explain human attraction between male and female? How can guys tell when women like them? I see females look my way, but eyes don't talk.

Out of Bounds: This question, about how to attract and find a partner, is way out of bound for this simple health website. Perhaps you can do some therapy or go to a class on how to date, but there is little we can do here to answer this life long quest to find the love of your life. ...Read more

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Eagle eyes are sharp, why no transplant of corneal for human?

Eagle eyes are sharp, why no transplant of corneal for human?

Raptor eyes: Not quite. Raptors have two foveas connected by a visual streak. Their eyes are so large they cannot move. Fovea #1 is for far vision (seeing prey), and as they dive, the image goes down the visual streak until imaged on fovea #2 at the level of the talons. This allows them to catch their prey. Focusing has little to do with it. ...Read more

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How do you fix a floater in the retina in the human eye?

How do you fix a floater in the retina in the human eye?

Three options: Three options: live with it, yag laser, and vitrectomy. When living with it has been ruled out, consider the later two. An exam to establish that it is the floaters that are the cause of your concern. Remember there are risks with every surgical procedure, but vitrectomy is safe in good hands. Beware cataracts. Be sure to get dilated exam to check for retinal tears too. ...Read more

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I'm curious as to why is the blind spot in the human eye necessary?

I'm curious as to why is the blind spot in the human eye necessary?

Optic nerve: Its not that its necessary, but its where you're optic nerve is located. Information from your retinal fibers have to go somewhere and although its not optimally located, your brain compensates well enough that you hardly notice. ...Read more

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Might dogs spread eye infections to humans?

Might dogs spread eye infections to humans?

Unlikely: Most organisms are species specific and so a dog with an infected eye will not have a species that will transfer to humans. There are a few cross overs like rabies that can affect any mammal. ...Read more

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What effects di constriction and dilation have on the human eye?

What effects di constriction and dilation have on the human eye?

Focus: Pupillary size governs the amount of light entering the eye. Pressure within the eye is affected by pupil size and may result in glaucoma. Widely dilated eyes often result in blurred vision. ...Read more