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Keep scrolling for more More Definitions for eye eye. Entry 1 of 2 : the part of the body that you see with : an ability to understand and appreciate something seen — used to describe the way something looks to you eye.
Entry 1 of 2 1 : the organ of seeing that in vertebrates is a round organ filled with a jellylike material, is located in a bony cavity in the skull, and has a lens which focuses light on the retina 2 : the eye along with its surrounding parts as the eyelids 3 : the colored surface of the iris He has blue eyes.
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The pit deepened over time, the opening diminished in size, and the number of photoreceptor cells increased, forming an effective pinhole camera that was capable of dimly distinguishing shapes.
This would have led to a somewhat different evolutionary trajectory for the vertebrate eye than for other animal eyes.
The thin overgrowth of transparent cells over the eye's aperture, originally formed to prevent damage to the eyespot, allowed the segregated contents of the eye chamber to specialise into a transparent humour that optimised colour filtering, blocked harmful radiation, improved the eye's refractive index , and allowed functionality outside of water.
The transparent protective cells eventually split into two layers, with circulatory fluid in between that allowed wider viewing angles and greater imaging resolution, and the thickness of the transparent layer gradually increased, in most species with the transparent crystallin protein.
The gap between tissue layers naturally formed a biconvex shape, an optimally ideal structure for a normal refractive index. Independently, a transparent layer and a nontransparent layer split forward from the lens: the cornea and iris.
Separation of the forward layer again formed a humour, the aqueous humour. This increased refractive power and again eased circulatory problems.
Formation of a nontransparent ring allowed more blood vessels, more circulation, and larger eye sizes. Eyes are generally adapted to the environment and life requirements of the organism which bears them.
For instance, the distribution of photoreceptors tends to match the area in which the highest acuity is required, with horizon-scanning organisms, such as those that live on the African plains, having a horizontal line of high-density ganglia, while tree-dwelling creatures which require good all-round vision tend to have a symmetrical distribution of ganglia, with acuity decreasing outwards from the centre.
Of course, for most eye types, it is impossible to diverge from a spherical form, so only the density of optical receptors can be altered.
In organisms with compound eyes, it is the number of ommatidia rather than ganglia that reflects the region of highest data acquisition.
An extension of this concept is that the eyes of predators typically have a zone of very acute vision at their centre, to assist in the identification of prey.
The hyperiid amphipods are deep water animals that feed on organisms above them. Their eyes are almost divided into two, with the upper region thought to be involved in detecting the silhouettes of potential prey—or predators—against the faint light of the sky above.
Accordingly, deeper water hyperiids, where the light against which the silhouettes must be compared is dimmer, have larger "upper-eyes", and may lose the lower portion of their eyes altogether.
Acuity is higher among male organisms that mate in mid-air, as they need to be able to spot and assess potential mates against a very large backdrop.
It is not only the shape of the eye that may be affected by lifestyle. Eyes can be the most visible parts of organisms, and this can act as a pressure on organisms to have more transparent eyes at the cost of function.
Eyes may be mounted on stalks to provide better all-round vision, by lifting them above an organism's carapace; this also allows them to track predators or prey without moving the head.
Visual acuity , or resolving power, is "the ability to distinguish fine detail" and is the property of cone cells.
For example, if each pattern is 1. The highest such number that the eye can resolve as stripes, or distinguish from a grey block, is then the measurement of visual acuity of the eye.
For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD  1. A rat can resolve only about 1 to 2 CPD.
However, in the compound eye, the resolution is related to the size of individual ommatidia and the distance between neighbouring ommatidia.
Physically these cannot be reduced in size to achieve the acuity seen with single lensed eyes as in mammals.
Compound eyes have a much lower acuity than vertebrate eyes. In primates, geckos, and other organisms, these take the form of cone cells , from which the more sensitive rod cells evolved.
Most organisms with colour vision can detect ultraviolet light. This high energy light can be damaging to receptor cells.
With a few exceptions snakes, placental mammals , most organisms avoid these effects by having absorbent oil droplets around their cone cells.
The alternative, developed by organisms that had lost these oil droplets in the course of evolution, is to make the lens impervious to UV light—this precludes the possibility of any UV light being detected, as it does not even reach the retina.
The retina contains two major types of light-sensitive photoreceptor cells used for vision: the rods and the cones.
Rods cannot distinguish colours, but are responsible for low-light scotopic monochrome black-and-white vision; they work well in dim light as they contain a pigment, rhodopsin visual purple , which is sensitive at low light intensity, but saturates at higher photopic intensities.
Rods are distributed throughout the retina but there are none at the fovea and none at the blind spot. Rod density is greater in the peripheral retina than in the central retina.
Two different exposure profiles, a daily average and short term 15 minute average, were used in the analysis. Exposure-response relations were evaluated by linking incidence rates for each symptom with categories of exposure.
Acute incidence rates for nasal, eye, and throat irritation , and coughing and breathlessness were found to be associated with increased exposure levels of both exposure indices.
Steeper exposure-response slopes were seen when short term exposure concentrations were used. Results from multivariate logistic regression analysis suggest that current smokers tended to be less sensitive to the exposure to airborne sodium borate dust.
In addition, other measures are proper lid hygiene, avoidance of eye rubbing,  and proper use of personal products and medication. Eye make-up should be used with care.
There are many diseases , disorders, and age-related changes that may affect the eyes and surrounding structures. As the eye ages, certain changes occur that can be attributed solely to the aging process.
Most of these anatomic and physiologic processes follow a gradual decline. With aging, the quality of vision worsens due to reasons independent of diseases of the aging eye.
While there are many changes of significance in the non-diseased eye, the most functionally important changes seem to be a reduction in pupil size and the loss of accommodation or focusing capability presbyopia.
The area of the pupil governs the amount of light that can reach the retina. The extent to which the pupil dilates decreases with age, leading to a substantial decrease in light received at the retina.
In comparison to younger people, it is as though older persons are constantly wearing medium-density sunglasses.
Therefore, for any detailed visually guided tasks on which performance varies with illumination, older persons require extra lighting.
Certain ocular diseases can come from sexually transmitted diseases such as herpes and genital warts. If contact between the eye and area of infection occurs, the STD can be transmitted to the eye.
With aging, a prominent white ring develops in the periphery of the cornea called arcus senilis. Aging causes laxity, downward shift of eyelid tissues and atrophy of the orbital fat.
These changes contribute to the etiology of several eyelid disorders such as ectropion , entropion , dermatochalasis , and ptosis.
The vitreous gel undergoes liquefaction posterior vitreous detachment or PVD and its opacities — visible as floaters — gradually increase in number.
A Snellen chart is one type of eye chart used to measure visual acuity. At the conclusion of a complete eye examination , the eye doctor might provide the patient with an eyeglass prescription for corrective lenses.
Some disorders of the eyes for which corrective lenses are prescribed include myopia near-sightedness , hyperopia far-sightedness , astigmatism , and presbyopia the loss of focusing range during aging.
Macular degeneration is especially prevalent in the U. Lutein and zeaxanthin bind to the electron free radical and are reduced rendering the electron safe.
There are many ways to ensure a diet rich in lutein and zeaxanthin, the best of which is to eat dark green vegetables including kale, spinach, broccoli and turnip greens.
Nutrition is an important aspect of the ability to achieve and maintain proper eye health. Lutein and zeaxanthin are two major carotenoids, found in the macula of the eye, that are being researched to identify their role in the pathogenesis of eye disorders such as age-related macular degeneration and cataracts.
From Wikipedia, the free encyclopedia. This article is about the human eye. For eyes in general, see Eye. For other uses, see Eye disambiguation.
Mammalian eye; part of the visual organ of the human body, and move using a system of six muscles. This article uses anatomical terminology. The human eye of the right side of the face, showing a white sclera with some blood vessels, a green iris , and the black pupil.
Schlemm's canal 6. Main article: Extraocular muscles. The tear glands lacrimal glands , located above each eyeball, continuously supply tear fluid that's wiped across the surface of your eye each time you blink your eyes.
Excess fluid drains through the tear ducts into the nose. Dry eyes are caused by a variety of reasons that disrupt the healthy tear film.
Your tear film has three layers: fatty oils, aqueous fluid and mucus. This combination normally keeps the surface of your eyes lubricated, smooth and clear.
Problems with any of these layers can cause dry eyes. Reasons for tear film dysfunction are many, including hormone changes, autoimmune disease, inflamed eyelid glands or allergic eye disease.
For some people, the cause of dry eyes is decreased tear production or increased tear evaporation. More serious causes of eye redness include infections.
Infections can occur in different structures of the eye and typically produce additional symptoms such as pain, discharge, or changes in your vision.
If your eye redness is caused by a medical condition such as conjunctivitis or blepharitis, you may be able to treat your symptoms at home.
Warm compresses on the eye can help reduce the symptoms of these conditions. You should also make sure that you wash your hands frequently, avoid wearing makeup or contacts, and avoid touching the eye.
If your eye redness is accompanied by pain or changes in vision, you need to see your doctor for treatment. Your doctor will ask you about your symptoms, your current health conditions, and problems that may have caused irritation to your eye.For Beste Spielen Casino: Stellen Sie Ihren Gewinn Oder Verlust Grenzen Mit Casino, both an Play Ojo Casino M. Schießerei New York : JOSA Collin; Edward N. The Physiology of The Eye. Nature Reviews Neuroscience. A more convex lens refracts Iforex more strongly and focuses divergent light rays from near objects onto the retina, allowing closer objects to be brought into better focus. This ensures that individual photosensitive cells are continually stimulated in different degrees. New strategies in the treatment of dry-eye states". Casino 10 Euro Bonus Ohne Einzahlung Wadsworth Publishing. Spiele1001 should you Spiele Mahjongg your doctor? Sclera Episcleral layer Schlemm's canal Trabecular meshwork. If contact between the eye and area of infection occurs, the STD can be transmitted to the eye.