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Top competitors on query "where are the highest concentration of rods and cones in the retina"
http://serendip.brynmawr.edu/exchange/node/50 Competition: low
Then Beike in china said thats all rubish ofcourse you can inject adult stem cells close to the retina and expect that they will migrate to the damaged area but they also said each individuell is different and therefore the effect will not allways be the same. We need to be able to coax them, either by chemical means or by simply growing the tissue in a laboratory setting and implanting the newly grown tissue into the dmaged area
SparkNotes: Sensation and Perception: Vision
http://www.sparknotes.com/psychology/psych101/sensation/section2.rhtml Competition: low
An example of this is the phi phenomenon, or stroboscopic movement, which is an illusion of movement that happens when a series of images is presented very quickly, one after another. Gestalt psychology, a school of thought that arose in Germany in the early twentieth century, explored how people organize visual information into patterns and forms
Glossary of Ophthalmology Terms
http://www.doctor-hill.com/patients/glossary.htm Competition: low
Uncorrected visual acuity (UCVA): Best possible vision a person can achieve without corrective lenses measured in terms of Snellen lines on an eye chart . LASEK: Laser Epithelial Keratomileusis, a refractive surgery in which the epithelium is cut with a fine blade, called a trephine, and involves displacing the cornea l epithelium as a sheet and then replacing it to (theoretically) act as a natural bandage
Lesson Ideas: Optics: Worksheet 2
http://www.internal.schools.net.au/edu/lesson_ideas/optics/optics_wksht2_p1.html Competition: low
Once light reaches our eyes, signals are sent to our brain, and our brain deciphers the information in order to detect the appearance, location and movement of the objects we are sighting at. In people over sixty, the most common cause of blindness is macular degeneration, in which the macula becomes covered with scar tissue and vision is obscured
http://faculty.washington.edu/chudler/eyecol.html Competition: low
SUGGESTED TIMES for these activities: 45 minutes for introducing and discussing the activity, 45 minutes for the "Class Experiment;" and 45 minutes for Explor Time and "Try Your Own Experiment." BACKGROUND CONCEPTS 1. A "yellow" ganglion cell sends its "yellow" message to the brain when activated by a certain pattern from green and red cones, but no messages from blue cones
Neuroscience for Kids - Vision Exp.
http://faculty.washington.edu/chudler/chvision.html Competition: low
Octopus Eye (Image courtesy of Biodidac) Benham's Disk For grades 3-12 My FAVORITE illusion! Make colors appear using only black and white! Make your own Benham Disk Depth Perception - I For grades K-12 Two eyes are better than one, especially when it comes to depth perception. Hmmm...is the center circle on the right the same size as the center circle on the left? For many people it appears that the circle that is surrounded by the small circles is larger that the circle that is surrounded by the larger circles
http://www.ncbi.nlm.nih.gov/books/NBK1298/ Competition: low
Interestingly, a high degree of intrafamilial variability was observed with respect to the presence or absence of intellectual disability, leading the authors to suggest the possibility of a third allele or modifier gene in the development of cognitive disability in this subtype of LCA.IMPDH1 (LCA11). All newly diagnosed individuals with LCA should have testing for mutations in this gene and, if found, should undergo careful monitoring of renal function
http://users.ipfw.edu/abbott/120/adaptation.html Competition: low
Smell -- We can detect amazingly low concentrations of some chemicals in the air (e.g., perfumes) but although the perfume is still in the air about us, we quickly cease to detect it. Light Adaptation As with dark adaptation, light adaptation involves (a) an immediate change in pupil size (it becomes smaller, admitting less light), (b) a change in the sensitivity of the cones to light (it decreases), and (c) a change in the sensitivity of rods to light (it also decreases)
Your Eyes
http://kidshealth.org/kid/htbw/eyes.html Competition: low
This may have happened to you if you've been poked in the eye, if you've been in a dusty or smoking area, or if you've been near someone who's cutting onions. Then, the optic nerve carries those messages from the eye to the brain! The optic nerve serves as a high-speed telephone line connecting the eye to the brain
California Retina Consultants: Terminology
http://www.californiaretina.com/section.asp/csasp/DepartmentID.1055/cs/SectionID.2278/csasp.html Competition: low
The light sensitive nerve tissue in the eye that converts images from the eye's optical system (cornea and lens) into electrical impulses that are sent along the optic nerve to the brain, to interpret as vision. blue eyes, brown eyes) and controls the amount of light that enters the eye by varying the size of the pupillary opening according to lighting conditions
The eye - The Sense Organs - blood, body, brain, parts, high, skin, white, muscle
http://www.faqs.org/health-encyc/Your-Body/The-Sense-Organs-The-eye.html Competition: low
One of the principal constituents of visual purple is vitamin A, which is why this vitamin (present in carrots and other yellow produce) is said to increase our capacity to see in the dark. The tiny space between the cornea and lens, corresponding to the pupil, is called the anterior chamber and is filled with the clear, watery, aqueous humor
http://www.austincc.edu/histologyhelp/organs/of_retina.html Competition: low
(The pigmented epithelium of the retina is not the same pigmented layer that is visible as a black stripe in the other images on this page.) The retinal pigmented epithelium is simple columnar, so it is very thin
http://www.medicinenet.com/retinal_detachment/article.htm Competition: low
Three types of benign uterine growths are uterine fibroids, adenomyosis, and Cataracts A cataract is an eye disease that causes the eye's lens to become cloudy and opaque with decreased vision. The peripheral retina allows us to see objects on either side (peripheral vision) and, therefore, provides the vision needed for a person to move about safely
http://www.ncbi.nlm.nih.gov/books/NBK1417/ Competition: low
Responses obtained under dark-adapted conditions with stimluli that are dim or blue generally reflect rod function, and responses obtained under light-adapted conditions or with 30 Hz flicker stimuli generally reflect cone function. Family history may be "negative" because of early death of a parent, failure to recognize retinitis pigmentosa in family members, late onset in a parent, incomplete penetrance of the mutant allele in an asymptomatic parent, or a de novo mutation
http://www.visionaware.org/section.aspx?FolderID=6&SectionID=120 Competition: low
Early eye examinations can detect vision problems related to the disorder, which can usually be corrected with eyeglasses, contact lenses or eye surgery. Daily medication (usually eye drops), surgery, or a combination of both enables most people to control their intraocular pressure and retain their vision
Webvision - The Organization of the Retina and Visual System
http://webvision.med.utah.edu/ Competition: low
Dysfunction in conserved ciliary structure and function therefore results in a variety of disorders (termed ciliopathies) which include polycystic kidney disease, anosmia, obesity, bronchiectasis and hydrocephalus, to name a few. This approach allowed them to perform day-by-day inactivations, achieving a temporal scale of gene expression control not previously reported in the retina
The Eye and Its Parts
http://www.99main.com/~charlief/Blindness.htm Competition: low
Lateral Geniculate Nucleus - (LGN) This part of the brain acts as a relay station; it decodes visual information from the optic tract before sending it to the visual cortex for final processing. There are three types of cone cells: one sensitive to red light, another to green light, and the third sensitive to blue light.Rod cells are about 500 times more sensitive to light then cone cells; they give us our dim light or night vision
http://webvision.med.utah.edu/book/part-i-foundations/simple-anatomy-of-the-retina/ Competition: low
Simple organization of the retina When an anatomist takes a vertical section of the retina and processes it for microscopic examination it becomes obvious that the retina is much more complex and contains many more nerve cell types than the simplistic scheme (above) had indicated. Though the reality is that at some point in the middle of the outer plexiform layer the retina makes the transition as that is the connectivity layer between the photoreceptors and horizontal and bipolar cells
http://www.stanford.edu/group/stanfordbirds/text/essays/Hawk-Eyed.html Competition: low
Hawk-Eyed Hawk-Eyed Birds and people are "sight animals." For both, the eyes are the dominant sense organs, vastly more important than their inferior sense of smell. However, the diversity of visual pigments found in birds' eyes, and the presence of an array of brightly colored oil droplets inside the cones, suggest that avian color perception may surpass our own
Retina International
http://www.retina-international.org/index.php?menuid=36 Competition: low
Individually available information about you is not disclosed to any third party without first receiving your permission, Disclaimer, Privacy Statement
SIU SOM Histology SSB
http://www.siumed.edu/~dking2/ssb/eye.htm Competition: low
The low cuboidal cells which form the cornea's innermost layer, the so-called corneal endothelium, actively pump ions and water from the corneal ground substance into the aqueous humor, to prevent excess water from disturbing the regularity of the collagen layers and causing opacity. The epithelium of the cornea is continuous with the epithelium of the conjunctive, both that of the eyeball itself and that of the inside of the eyelid, which in turn is continuous with the epidermis of skin on the exposed surface of the eyelid
http://neuroscience.uth.tmc.edu/s2/chapter14.html Competition: low
The off bipolar cell (Figure 14.27, Right) will depolarize when it is dark on its center cones and will therefore release glutamate when it is dark on the center of its receptive field. The cones differ in the color of light their photopigments absorbs: one type of photopigment absorbs red light, another green light, and a third blue light
Eye exercises for best vision
http://www.forbestvision.com/retina-macula-fovea-foveola/ Competition: low
Generally speaking, the treatment of lazy eye should be started with easy exercises when infants begin to follow moving objects with their eyes at around three months of age. The macula lutea is approximately 5.5mm in diameter; its center is approximately 3.5mm lateral to the edge of the optic disc and approximately 1mm inferior to the center of the optic disc
The Eye: Structure, Focusing, Rod and Cone Cells
http://scienceaid.co.uk/biology/humans/eye.html Competition: low
There is a higher concentration of cone cells in the fovea.They are more sensitve to high light intensities and therefore colour can not be seen very easily when it is dark.Cones have a high visual acuity because each cone cell has a single connection to the optic nerve, so the cones are better able to tell that two stimuli are seperate. RodsCones Are spread evenly across the retina but there are none in the fovea.Rod cells are sensitive to low light intensities, so are made best use of at night.They have a low visual acuity because several rod cells share a connection to the optic nerve
Difference between rods and cones
http://wiki.answers.com/Q/Difference_between_rods_and_cones Competition: low
Answer History Related Answers: Difference between rods and cones? The main difference between rod cells and cone cells is that the rod cell is responsible for detecti What is the difference between rods and cones? cone cells help you see colors while rod cells helps you see in dim light Difference between rod cell and cone cell? Rod cells are sensitive to dim light, while cone cells help you see colors. How do rods and cones differ functionally? Rods: dim light and peripheral vision receptors, more sensitive to lightCones: operate in bright lig Difference between cone cell and rod cell of eye in human body? Rod cells pair one neuron with many light receptor cells
Retina - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Retina Competition: low
In order for higher functions in the brain (or in a computer for that matter) to extract and classify objects such as a dog and a cat, the retina is the first step to separating out the various objects within the scene. The optic nerve is a central tract of many axons of ganglion cells connecting primarily to the lateral geniculate body, a visual relay station in the diencephalon (the rear of the forebrain)
Photoreceptor cell - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Rods_and_cones Competition: low
The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. When glutamate binds to an ionotropic receptor, the bipolar cell will depolarize (and therefore will hyperpolarize with light as less glutamate is released)
Then Beike in china said thats all rubish ofcourse you can inject adult stem cells close to the retina and expect that they will migrate to the damaged area but they also said each individuell is different and therefore the effect will not allways be the same. We need to be able to coax them, either by chemical means or by simply growing the tissue in a laboratory setting and implanting the newly grown tissue into the dmaged area
SparkNotes: Sensation and Perception: Vision
An example of this is the phi phenomenon, or stroboscopic movement, which is an illusion of movement that happens when a series of images is presented very quickly, one after another. Gestalt psychology, a school of thought that arose in Germany in the early twentieth century, explored how people organize visual information into patterns and forms
Glossary of Ophthalmology Terms
Uncorrected visual acuity (UCVA): Best possible vision a person can achieve without corrective lenses measured in terms of Snellen lines on an eye chart . LASEK: Laser Epithelial Keratomileusis, a refractive surgery in which the epithelium is cut with a fine blade, called a trephine, and involves displacing the cornea l epithelium as a sheet and then replacing it to (theoretically) act as a natural bandage
Lesson Ideas: Optics: Worksheet 2
Once light reaches our eyes, signals are sent to our brain, and our brain deciphers the information in order to detect the appearance, location and movement of the objects we are sighting at. In people over sixty, the most common cause of blindness is macular degeneration, in which the macula becomes covered with scar tissue and vision is obscured
SUGGESTED TIMES for these activities: 45 minutes for introducing and discussing the activity, 45 minutes for the "Class Experiment;" and 45 minutes for Explor Time and "Try Your Own Experiment." BACKGROUND CONCEPTS 1. A "yellow" ganglion cell sends its "yellow" message to the brain when activated by a certain pattern from green and red cones, but no messages from blue cones
Neuroscience for Kids - Vision Exp.
Octopus Eye (Image courtesy of Biodidac) Benham's Disk For grades 3-12 My FAVORITE illusion! Make colors appear using only black and white! Make your own Benham Disk Depth Perception - I For grades K-12 Two eyes are better than one, especially when it comes to depth perception. Hmmm...is the center circle on the right the same size as the center circle on the left? For many people it appears that the circle that is surrounded by the small circles is larger that the circle that is surrounded by the larger circles
Interestingly, a high degree of intrafamilial variability was observed with respect to the presence or absence of intellectual disability, leading the authors to suggest the possibility of a third allele or modifier gene in the development of cognitive disability in this subtype of LCA.IMPDH1 (LCA11). All newly diagnosed individuals with LCA should have testing for mutations in this gene and, if found, should undergo careful monitoring of renal function
Smell -- We can detect amazingly low concentrations of some chemicals in the air (e.g., perfumes) but although the perfume is still in the air about us, we quickly cease to detect it. Light Adaptation As with dark adaptation, light adaptation involves (a) an immediate change in pupil size (it becomes smaller, admitting less light), (b) a change in the sensitivity of the cones to light (it decreases), and (c) a change in the sensitivity of rods to light (it also decreases)
Your Eyes
This may have happened to you if you've been poked in the eye, if you've been in a dusty or smoking area, or if you've been near someone who's cutting onions. Then, the optic nerve carries those messages from the eye to the brain! The optic nerve serves as a high-speed telephone line connecting the eye to the brain
California Retina Consultants: Terminology
The light sensitive nerve tissue in the eye that converts images from the eye's optical system (cornea and lens) into electrical impulses that are sent along the optic nerve to the brain, to interpret as vision. blue eyes, brown eyes) and controls the amount of light that enters the eye by varying the size of the pupillary opening according to lighting conditions
The eye - The Sense Organs - blood, body, brain, parts, high, skin, white, muscle
One of the principal constituents of visual purple is vitamin A, which is why this vitamin (present in carrots and other yellow produce) is said to increase our capacity to see in the dark. The tiny space between the cornea and lens, corresponding to the pupil, is called the anterior chamber and is filled with the clear, watery, aqueous humor
(The pigmented epithelium of the retina is not the same pigmented layer that is visible as a black stripe in the other images on this page.) The retinal pigmented epithelium is simple columnar, so it is very thin
Three types of benign uterine growths are uterine fibroids, adenomyosis, and Cataracts A cataract is an eye disease that causes the eye's lens to become cloudy and opaque with decreased vision. The peripheral retina allows us to see objects on either side (peripheral vision) and, therefore, provides the vision needed for a person to move about safely
Responses obtained under dark-adapted conditions with stimluli that are dim or blue generally reflect rod function, and responses obtained under light-adapted conditions or with 30 Hz flicker stimuli generally reflect cone function. Family history may be "negative" because of early death of a parent, failure to recognize retinitis pigmentosa in family members, late onset in a parent, incomplete penetrance of the mutant allele in an asymptomatic parent, or a de novo mutation
Early eye examinations can detect vision problems related to the disorder, which can usually be corrected with eyeglasses, contact lenses or eye surgery. Daily medication (usually eye drops), surgery, or a combination of both enables most people to control their intraocular pressure and retain their vision
Webvision - The Organization of the Retina and Visual System
Dysfunction in conserved ciliary structure and function therefore results in a variety of disorders (termed ciliopathies) which include polycystic kidney disease, anosmia, obesity, bronchiectasis and hydrocephalus, to name a few. This approach allowed them to perform day-by-day inactivations, achieving a temporal scale of gene expression control not previously reported in the retina
The Eye and Its Parts
Lateral Geniculate Nucleus - (LGN) This part of the brain acts as a relay station; it decodes visual information from the optic tract before sending it to the visual cortex for final processing. There are three types of cone cells: one sensitive to red light, another to green light, and the third sensitive to blue light.Rod cells are about 500 times more sensitive to light then cone cells; they give us our dim light or night vision
Simple organization of the retina When an anatomist takes a vertical section of the retina and processes it for microscopic examination it becomes obvious that the retina is much more complex and contains many more nerve cell types than the simplistic scheme (above) had indicated. Though the reality is that at some point in the middle of the outer plexiform layer the retina makes the transition as that is the connectivity layer between the photoreceptors and horizontal and bipolar cells
Hawk-Eyed Hawk-Eyed Birds and people are "sight animals." For both, the eyes are the dominant sense organs, vastly more important than their inferior sense of smell. However, the diversity of visual pigments found in birds' eyes, and the presence of an array of brightly colored oil droplets inside the cones, suggest that avian color perception may surpass our own
Retina International
Individually available information about you is not disclosed to any third party without first receiving your permission, Disclaimer, Privacy Statement
SIU SOM Histology SSB
The low cuboidal cells which form the cornea's innermost layer, the so-called corneal endothelium, actively pump ions and water from the corneal ground substance into the aqueous humor, to prevent excess water from disturbing the regularity of the collagen layers and causing opacity. The epithelium of the cornea is continuous with the epithelium of the conjunctive, both that of the eyeball itself and that of the inside of the eyelid, which in turn is continuous with the epidermis of skin on the exposed surface of the eyelid
The off bipolar cell (Figure 14.27, Right) will depolarize when it is dark on its center cones and will therefore release glutamate when it is dark on the center of its receptive field. The cones differ in the color of light their photopigments absorbs: one type of photopigment absorbs red light, another green light, and a third blue light
Eye exercises for best vision
Generally speaking, the treatment of lazy eye should be started with easy exercises when infants begin to follow moving objects with their eyes at around three months of age. The macula lutea is approximately 5.5mm in diameter; its center is approximately 3.5mm lateral to the edge of the optic disc and approximately 1mm inferior to the center of the optic disc
The Eye: Structure, Focusing, Rod and Cone Cells
There is a higher concentration of cone cells in the fovea.They are more sensitve to high light intensities and therefore colour can not be seen very easily when it is dark.Cones have a high visual acuity because each cone cell has a single connection to the optic nerve, so the cones are better able to tell that two stimuli are seperate. RodsCones Are spread evenly across the retina but there are none in the fovea.Rod cells are sensitive to low light intensities, so are made best use of at night.They have a low visual acuity because several rod cells share a connection to the optic nerve
Difference between rods and cones
Answer History Related Answers: Difference between rods and cones? The main difference between rod cells and cone cells is that the rod cell is responsible for detecti What is the difference between rods and cones? cone cells help you see colors while rod cells helps you see in dim light Difference between rod cell and cone cell? Rod cells are sensitive to dim light, while cone cells help you see colors. How do rods and cones differ functionally? Rods: dim light and peripheral vision receptors, more sensitive to lightCones: operate in bright lig Difference between cone cell and rod cell of eye in human body? Rod cells pair one neuron with many light receptor cells
Retina - Wikipedia, the free encyclopedia
In order for higher functions in the brain (or in a computer for that matter) to extract and classify objects such as a dog and a cat, the retina is the first step to separating out the various objects within the scene. The optic nerve is a central tract of many axons of ganglion cells connecting primarily to the lateral geniculate body, a visual relay station in the diencephalon (the rear of the forebrain)
Photoreceptor cell - Wikipedia, the free encyclopedia
The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. When glutamate binds to an ionotropic receptor, the bipolar cell will depolarize (and therefore will hyperpolarize with light as less glutamate is released)
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