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Topic: Human eye

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In the News (Fri 24 May 19)

  Evolution and the human eye
A frequently raised criticism of evolution in any evolution-creation debate is that of the human eye.
Little was known about mollusks' eyes at the time, and Paley merely treated the blind spots as one of the problems the eye must solve.
All the way to the human eye and hand and immune system and all the other well-engineered machinery by which we, and all other organisms, solve the problems of life...
www.2think.org /eye.shtml   (1505 words)

  Eye - Wikipedia, the free encyclopedia
Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris which regulates the intensity of the light that enters the eye.
The eyes are automatically rotated to remain fixed on the object, directed by input from the organs of balance near the ears.
He dissected the eyes of animals, and discovering three layers (not two), found that the fluid was of a constant consistency with the lens forming (or congealing) after death, and the surrounding layers were seen to be juxtaposed.
en.wikipedia.org /wiki/Eye   (4598 words)

 AllRefer.com - eye : The Human Eye : Anatomy and Function (Anatomy And Physiology) - Encyclopedia
The human eye is a spheroid structure that rests in a bony cavity (socket, or orbit) on the frontal surface of the skull.
The iris is the area of the eye where the pigmentation of the choroid layer, usually brown or blue, is visible because it is not covered by the sclera.
Accessory structures of the eye are the lacrimal gland and its ducts in the upper lid, which bathe the eye with tears, keeping the cornea moist, clean, and brilliant, and drainage ducts that carry the excess moisture to the interior of the nose.
reference.allrefer.com /encyclopedia/E/eye-the-human-eye.html   (546 words)

 [No title]
The actual existence of such receptor cells, known as cones, have maximum sensitivities in the red, green, and blue regions of the spectrum, with absorption peaks near 565 nm for red, 535 nm for green and 445 nm for blue.
When the human eye looks at a colored object and a few minutes later at a similar, it cannot tell us from memory whether the colors are different unless the difference is substantial.
The human eye does not function as an instrument for spectral analysis, that means that the same color sensation can be produced by different physical stimulus.
home.wanadoo.nl /paulschils/05.00.html   (513 words)

 How many frames per second can the human eye see?
The fact is that the human eye perceives the typical cinema film motion as being fluid at about 18fps, because of its blurring.
If you had a movie with 50 very sharp and crisp images per second, your eye would make out lots of details from time to time and you had the feeling, that the movie is stuttering.
Even though single eye cells (rods and cones) may have their limitations due to their chemical reaction times and due to the distance to the brain, you cannot be sure how they interact or complement or synchronize.
www.100fps.com /how_many_frames_can_humans_see.htm   (1385 words)

 The Genetics of Human Eye Color   (Site not responding. Last check: 2007-10-14)
A favorite pastime for many expectant parents is documenting the eye color of grandparents and extended family members to attempt to predict the eye color of their baby.
In basic terms, eye color is determined by the amount of a pigment called melanin that is in the iris of the eye.
The exact color of the human eye is determined by the amount of a single pigment called melanin that is present in the iris of the eye.
www.seps.org /cvoracle/faq/eyecolor.html   (1333 words)

 How We See: The First Steps of Human Vision   (Site not responding. Last check: 2007-10-14)
Aristotle's explanation of the process of human vision was that the object being looked at somehow altered the "medium" (now known to be air) between the object itself and the viewer's eye.
A sketch of the anatomical components of the human eye, as we now know it, is shown in Figure 1.
Young was the first to propose that the human eye sees only the three primary colors, red, blue and yellow and that all of the other visible colors are combinations of these.
www.accessexcellence.org /AE/AEC/CC/vision_background.html   (2917 words)

 Diameter of a Human Eye
The human eye is the organ of sight.
Eye formation begins during the end of the third week of development when outgrowths of brain neural tissue, called the optic vesicles, form at the sides of the forebrain region.
During the remainder of the prenatal period, eye structures continue to enlarge, mature and form increasingly complex neural networks with the visual processing regions of the brain.
www.hypertextbook.com /facts/2002/AniciaNdabahaliye1.shtml   (280 words)

 Neuroscience for Kids - Vision
Humans are very visual animals...we use our sense of sight to interpret much of the world around us.
retina is the area of the eye that contains the receptors (rods and cones) that respond to light.
The word "pupil" comes from the Latin word "pupa" that means "doll." The use of the word pupil for the center of the eye may have come from the observation that if you look into the eye of another person, a small version of yourself (a "doll") is reflected back.
faculty.washington.edu /chudler/bigeye.html   (676 words)

 Wikipedia:Neutral point of view - Wikipedia, the free encyclopedia
But human beings disagree about specific cases; for any topic on which there are competing views, each view represents a different idea of what the truth is, and insofar as that view contradicts other views, its adherents believe that the other views are false and therefore not knowledge.
To write from a neutral point of view, one presents controversial views without asserting them; to do that, it generally suffices to present competing views in a way that is more or less acceptable to their adherents, and also to attribute the views to their adherents.
In the case of human beliefs and practices, explanation encompasses not only what motivates individuals who hold these beliefs and practices, but an account of how such beliefs and practices came to be and took shape.
en.wikipedia.org /wiki/Wikipedia:Neutral_point_of_view   (5744 words)

 Gross Anatomy of the Eye   (Site not responding. Last check: 2007-10-14)
Eye color, or more correctly, iris color is due to variable amounts of eumelanin (brown/fl melanins) and pheomelanin (red/yellow melanins) produced by melanocytes.
When we remove the eye from the orbit, we can see that the eye is a slightly asymmetrical sphere with an approximate sagittal diameter or length of 24 to 25 mm.
Surface membranes cover the eye cup and develop into lens, iris and cornea with the three chambers of fluid filled with aqueous and vitreous humors.
webvision.med.utah.edu /anatomy.html   (1334 words)

 Newton's Apple: Teacher's Guides   (Site not responding. Last check: 2007-10-14)
Human beings can obtain a large amount of information about the surrounding environment through their sense of vision.
When your eye focuses on an object, all the light rays from a single point on that object are bent toward a single point on your retina.
Within each eye is a small blind spot with no rods or cones, where the optic nerve is attached to the eyeball.
www.ktca.org /newtons/14/humaneye01.html   (1176 words)

 Astronomy and the Human Eye   (Site not responding. Last check: 2007-10-14)
The human lens grows continuously with age, with new cells added on the outside of the lens, resulting in an onion-like layering of cells with age.
Your eye is remarkably efficient, able to produce a signal with only one photon, Though the brain routinely suppresses single photons as noise, and generally you need 2-3 photons over a small area in a short time span to produce a signal (pixel) to the brain.
Your eye utilizes nearly all of the oxygen that reaches it, and is also dependent on glucose (sugar).
www.atmob.org /Articles/AstroAndEye.html   (843 words)

 The Human Eye
Darwin was at a loss to explain exactly what was happening, but he proposed a stepwise evolution of the human eye by showing examples of differences in the eyes of other creatures that seemed to be less complex.
With one exception, all the eyes I have so far illustrated have had their photocells in front of the nerves connecting them to the brain.
To say then that the human eye is definite proof of a lack thoughtful design, is a bit presumptuous I would think.
www.rae.org /HumanEye.html   (4429 words)

 The Physics Classroom
The human eye is a complex anatomical device that remarkably demonstrates the architectural wonders of the human body.
In bright-light situations, the iris is dilated to reduce the size of the pupil and limit the amount of light which enters the eye; and in dim-light situations, the iris adjusts its size so as to maximize the size of the pupil and increase the amount of light which enters the eye.
An adult eye is typically equipped with 120 million rods which detect the intensity of light and 6 million cones which detect the frequency of light.
www.physicsclassroom.com /Class/refrn/U14L6a.html   (634 words)

Normally, eye resolution is far less at the edges of the field of view than near the center where most detail is seen.
The pinhole eye design occurs in the eyes of the nautilus, the eyes of a planarian (flat worm) and the eyes of other simple animal forms.
For most insects, the total eye volume required for a scaled-down pinhole design would be much larger for a given angular field than more complex multifaceted eyes taking into account the expected light gathering power and resolution of each facet.
www.eyedesignbook.com /ch2/eyech2-abc.html   (1565 words)

 Eye Resources on the Internet
Anatomy, Physiology and Pathology of the Human Eye
The eye motion simulator demonstrates the effects of disabling one or more of the 12 eyes muscles and one or more of the 6 cranial nerves that control eye motion.
Wilmer Eye Institute, the Department of Ophthalmology of the Johns Hopkins University School of Medicine and Johns Hopkins Hospital, Baltimore, Maryland.
webeye.ophth.uiowa.edu /dept/websites/eyeres.htm   (10056 words)

 Clarkvision Photography - Resolution of the Human Eye
Note that at ISO 800 on a 10D, the gain is 2.7 electrons/pixel (reference: http://clarkvision.com/imagedetail/digital.signal.to.noise) which would be similar to the eye being able to see a couple of photons for a detection.
The Human eye is able to function in bright sunlight and view faint starlight, a range of more than 10 million to one.
The f/stop maximum in the astronomical community is spec'd at f/3.5 for a dark adapted human eye.
www.clarkvision.com /imagedetail/eye-resolution.html   (1648 words)

 The human eye cannot spot the offside rule   (Site not responding. Last check: 2007-10-14)
The human eye is unable to detect an offside position during a football match, claims a doctor from Spain in this week's Christmas issue of the BMJ.
To apply the offside rule correctly, the referee must be able to keep at least five moving objects in his visual field at the same time (two players of the attacking team, the last two players of the defending team, and the ball).
This is beyond the capacity of the human eye, especially as these five objects can be anywhere within the defenders' half of the pitch, an area of at least 3200m2, says the author.
www.eurekalert.org /pub_releases/2004-12/bmj-the121504.php   (244 words)

 FreeVisĀ® Lasik Centers: Eye an Vision - the human eye
The anatomy of the normal human eye, seen from the side, is shown in Figure 1.
The foremost part of the eye is transparent and is called the cornea.
The anatomy of the eye is readily comparable to the construction of a camera (see figure 2).
www.lasik-center.com /info/auge.html   (378 words)

 The Human Eye
The applet is a simplified model of the eye in which the front of the eye is a single converging lens.
In the applet accommodation is accomplished by using the slider at the bottom to vary the focal length of the lens.
Since light is focused in front of the retina in a nearsighted eye, nearsightedness is corrected using a diverging lens.
webphysics.davidson.edu /physlet_resources/dav_optics/Examples/eye_demo.html   (720 words)

 Standardized Human Eye
Upon elimination of the collimator lens, the field corrector, the continuous gradient index of refraction for the lens, and limiting the field angle to ~0.0; the resulting simplified paraxial (Gaussian) optics is identical to that of Gullstrand.
The temporal performance of the human eye is a function of which signal path is involved and the irradiance level.
Tremor in the eye causes a sharp edge in the object field to be sampled at up to 90 Hertz.
www.4colorvision.com /standeye.htm   (1191 words)

 HUMAN EYE PICTURE   (Site not responding. Last check: 2007-10-14)
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www.cashinfo.biz /25k/human-eye-picture.html   (175 words)

 FAQ - How Does The Human Eye Work?
The individual components of the eye work in a manner similar to a camera.
eye function properly, light is converted to impulses and conveyed to the brain where an
eye corresponds to the "blind spot" since there are no rods or cones in these location.
www.pasadenaeye.com /faq/faq15/faq15_text.html   (910 words)

 Human eye - toric contact lenses
The optical system of the eye has to focus an image of the world around us onto the retina - a sheet of light sensitive cells within the eye.
Astigmatism is where the optical system of the eye, particularly the front surface of the cornea, has one curvature going across the eye and a different curvature at right angles to this.
An eye with astigmatism does not have a single position of focus where that small distant light can be focussed as a point.
www.terencemendoza.co.uk /human_eye_astigmatism.htm   (909 words)

 Eye Anatomy - one our most important sensory organs
The optic nerve and the central retinal blood vessels enter the back of the eye at the disc (also called the blind spot).
The back 2/3 of the eye is called the retina and gives us our wide field of view vision.
The sclera is the tough outer wall of the eye and the choroid is the thin spongy layer between it and the retina filled with blood vessels.
www.brianseye.com /anatomy.htm   (172 words)

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