Sensation
... conversion of one form of energy to another in sensation, transforming of stimulus energies into neural impulses ...
... conversion of one form of energy to another in sensation, transforming of stimulus energies into neural impulses ...
OUf Amazing Eyes* ( - - - -
... other things, receptor cells that are stimulatedby light. Visualimagespickedup by your eyes are translatedinto nervous impulses that are eventuallyinterpretedby the brain. Amazingly,we not only "see" a very clear and precise image through our eyes, we also record this image in living color! Hopefull ...
... other things, receptor cells that are stimulatedby light. Visualimagespickedup by your eyes are translatedinto nervous impulses that are eventuallyinterpretedby the brain. Amazingly,we not only "see" a very clear and precise image through our eyes, we also record this image in living color! Hopefull ...
Idiopathic Choroidal Neovascularization
... The light entering the human eye through the pupil is focused on the back lining of the eye, a layer of nerve tissue called the retina. There, photoreceptor cells turn the incident light into nerve signals, a process called phototransduction. The nerve signals travel to the brain via the optic nerve ...
... The light entering the human eye through the pupil is focused on the back lining of the eye, a layer of nerve tissue called the retina. There, photoreceptor cells turn the incident light into nerve signals, a process called phototransduction. The nerve signals travel to the brain via the optic nerve ...
Association Cortex and Smooth Pursuit Eye Movements
... The POINT of this Demonstration: The brain is wired to perceive motion even though in this demonstration none of the objects were actually moving ...
... The POINT of this Demonstration: The brain is wired to perceive motion even though in this demonstration none of the objects were actually moving ...
Cow Eye Dissection (Key)
... At very back of eye; pink and as thick as a pencil; may be surrounded bv fat and muscle. Tough, whiter outer covering of eye; easily seen at the front of eye Clear covering at front of eye ...
... At very back of eye; pink and as thick as a pencil; may be surrounded bv fat and muscle. Tough, whiter outer covering of eye; easily seen at the front of eye Clear covering at front of eye ...
Bitemporal Hemianopia Caused by Retinal Disease
... rate of both cone and rod responses. A diagnosis of acute zonal occult outer retinopathy, a disorder known to produce diffuse or focal field defects, was made.3,4 Comment. To our knowledge, this is the first case report of bilateral temporal hemianopic defects from a retinal disorder. In this case, ...
... rate of both cone and rod responses. A diagnosis of acute zonal occult outer retinopathy, a disorder known to produce diffuse or focal field defects, was made.3,4 Comment. To our knowledge, this is the first case report of bilateral temporal hemianopic defects from a retinal disorder. In this case, ...
A1981MJ56400001
... excitability cycles in a few subjects willing to endure long hours of experimentation (the excitability cycles in figures 4 and 5 are from my wife). “When I submitted the paper for publication, it was written so badly that it was saved from rejection only by an extremely kind reviewer who rewrote al ...
... excitability cycles in a few subjects willing to endure long hours of experimentation (the excitability cycles in figures 4 and 5 are from my wife). “When I submitted the paper for publication, it was written so badly that it was saved from rejection only by an extremely kind reviewer who rewrote al ...
CONDUCTIVE KERATOPLASTY(CK)
... contact lenses following the procedure • Can be used for patients with dry eyes ...
... contact lenses following the procedure • Can be used for patients with dry eyes ...
Visual Spectrum
... • Diplopia: double vision. Demonstrate this simply by holding your thumb near your eyes and looking at something far. – This is constantly occurring, in less extreme cases (i.e., objects further from your eyes than in the thumb demo), but you tend not to notice it. Why? (text lists some possibilitie ...
... • Diplopia: double vision. Demonstrate this simply by holding your thumb near your eyes and looking at something far. – This is constantly occurring, in less extreme cases (i.e., objects further from your eyes than in the thumb demo), but you tend not to notice it. Why? (text lists some possibilitie ...
Chapter 18 Senses - Fullfrontalanatomy.com
... 3. Lens : Thick, transparent & biconvex. Concentric layers of cells that become fibers. Fibers are proteins folded in such a way that they are transparent. Fibers added throughout life lens thickens with age, is denser more convex & less elastic- ability to focus diminishes in old age. ...
... 3. Lens : Thick, transparent & biconvex. Concentric layers of cells that become fibers. Fibers are proteins folded in such a way that they are transparent. Fibers added throughout life lens thickens with age, is denser more convex & less elastic- ability to focus diminishes in old age. ...
12/2007 SM 1 OCULAR PATHOLOGY GLAUCOMA • Leading cause
... Wet ARMD – aka exudative or neovascular. More common than dry type. o Characterized by abnormal growth of vessels from the choroidal and retinal circulations (retinal is less frequent) into the subretinal space. These vessels are leaky which can result in exudative retinal detachment and/or hemorrha ...
... Wet ARMD – aka exudative or neovascular. More common than dry type. o Characterized by abnormal growth of vessels from the choroidal and retinal circulations (retinal is less frequent) into the subretinal space. These vessels are leaky which can result in exudative retinal detachment and/or hemorrha ...
The Eye and How It Works
... or makes it smaller. This limits the amount of light which passes through the pupil to the retina at the back of the eye. The retina may be thought of as the camera´s film. When there is little or no light, the iris dilates the pupil, widening it so that more light can enter the eye. The lens, which ...
... or makes it smaller. This limits the amount of light which passes through the pupil to the retina at the back of the eye. The retina may be thought of as the camera´s film. When there is little or no light, the iris dilates the pupil, widening it so that more light can enter the eye. The lens, which ...
A Patient With Acute Visual Loss and Transient
... A Patient With Acute Visual Loss and Transient Neurologic Symptoms continued ...
... A Patient With Acute Visual Loss and Transient Neurologic Symptoms continued ...
consist of receptors and accessory organs. Skin, visual organ
... the ciliary body (consist of ciliary muscle ) ciliary processes—ciliary zonule---lens ciliary muscle relax---curvature of lens↓ ciliary muscle contract---curvature of lens ↑ ...
... the ciliary body (consist of ciliary muscle ) ciliary processes—ciliary zonule---lens ciliary muscle relax---curvature of lens↓ ciliary muscle contract---curvature of lens ↑ ...
The ganglion cell complex and glaucoma
... GCC scans that are centred on the fovea to a diameter of between 6 mm and 9 mm, depending on the instrument and software settings. The results can be displayed as an absolute GCC thickness, as well as a probability map compared to the OCT’s normative ...
... GCC scans that are centred on the fovea to a diameter of between 6 mm and 9 mm, depending on the instrument and software settings. The results can be displayed as an absolute GCC thickness, as well as a probability map compared to the OCT’s normative ...
Ophthalmic emergencies.RC
... previously her vision in right eye has suddenly been lost. There has been no improvement since. The eye is not painful or red. • Past ophthalmic history: early cataracts in both eyes. • Past history: angina, hypertension. Both well controlled with medication. ...
... previously her vision in right eye has suddenly been lost. There has been no improvement since. The eye is not painful or red. • Past ophthalmic history: early cataracts in both eyes. • Past history: angina, hypertension. Both well controlled with medication. ...
evolution of the eye
... that jawed vertebrates inherited the traits from a common ancestor and that our eye had already evolved by around 420 million years ago, when the first jawed vertebrates (which probably resembled modern-day cartilaginous fish such as sharks) patrolled the seas. We reasoned that our camera-style eye an ...
... that jawed vertebrates inherited the traits from a common ancestor and that our eye had already evolved by around 420 million years ago, when the first jawed vertebrates (which probably resembled modern-day cartilaginous fish such as sharks) patrolled the seas. We reasoned that our camera-style eye an ...
The Eye - Downey Unified School District
... ● Dark vs Light vision● The “Dark” vision( scotopic vision): the rods are responsible for vision under very dim levels of illumination. They provide the capability for seeing colors and resolving better detail ( 20/20 or better) o o ...
... ● Dark vs Light vision● The “Dark” vision( scotopic vision): the rods are responsible for vision under very dim levels of illumination. They provide the capability for seeing colors and resolving better detail ( 20/20 or better) o o ...
pdf
... - The Hebbian theory: synaptic strength is derived from repeated and persistent stimulation of a postsynaptic cell by a ...
... - The Hebbian theory: synaptic strength is derived from repeated and persistent stimulation of a postsynaptic cell by a ...
Department of Ophthalmology, Kharkiv National Medical University
... patients with preperimetric glaucoma. Materials and methods: Examined and monitored in the dynamics of 32 patients (47 eyes) with preperimetric glaucoma of them men - 14, women - 18. The age of patients ranged from 40 to 77 years. Ophthalmic examination included conventional methods, automated stati ...
... patients with preperimetric glaucoma. Materials and methods: Examined and monitored in the dynamics of 32 patients (47 eyes) with preperimetric glaucoma of them men - 14, women - 18. The age of patients ranged from 40 to 77 years. Ophthalmic examination included conventional methods, automated stati ...
introduction - Institute for Data Analysis and Visualization
... An accurate solid eye model (with volumetric retinal morphology) is likely to have numerous applications in the field of ophthalmology, including the evaluation of ophthalmic instruments as well as optometry/ophthalmology training. We present a method that uses volumetric OCT retinal data sets to cr ...
... An accurate solid eye model (with volumetric retinal morphology) is likely to have numerous applications in the field of ophthalmology, including the evaluation of ophthalmic instruments as well as optometry/ophthalmology training. We present a method that uses volumetric OCT retinal data sets to cr ...
The Eye - Calgary Emergency Medicine
... Which of the following ocular problems is most commonly ...
... Which of the following ocular problems is most commonly ...
Vision Handicaps Learning Aids
... in the eye (aqueous humour). The term "ocular hypertension" is used for people with consistently raised intraocular pressure (IOP) without any associated optic nerve damage. Conversely, the term 'normal tension' or 'low tension' glaucoma is used for those with optic nerve damage and associated visua ...
... in the eye (aqueous humour). The term "ocular hypertension" is used for people with consistently raised intraocular pressure (IOP) without any associated optic nerve damage. Conversely, the term 'normal tension' or 'low tension' glaucoma is used for those with optic nerve damage and associated visua ...
- International Council of Ophthalmology
... (abducting) eye • NORMAL CONVERGENCE • Causes – Young patients • Bilateral • Demyelination – Older patients • Unilateral • Vascular, tumours ...
... (abducting) eye • NORMAL CONVERGENCE • Causes – Young patients • Bilateral • Demyelination – Older patients • Unilateral • Vascular, tumours ...
Clinical Examination - International Council of Ophthalmology
... (abducting) eye • NORMAL CONVERGENCE • Causes – Young patients • Bilateral • Demyelination – Older patients • Unilateral • Vascular, tumours ...
... (abducting) eye • NORMAL CONVERGENCE • Causes – Young patients • Bilateral • Demyelination – Older patients • Unilateral • Vascular, tumours ...
Retina
The retina (/ˈrɛtɪnə/ RET-i-nə, pl. retinae, /ˈrɛtiniː/; from Latin rēte, meaning ""net"") is the third and inner coat of the eye which is a light-sensitive layer of tissue. The optics of the eye create an image of the visual world on the retina (through the cornea and lens), which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centres of the brain through the fibres of the optic nerve.In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, so the retina is considered part of the central nervous system (CNS) and is actually brain tissue. It is the only part of the CNS that can be visualized non-invasively.The retina is a layered structure with several layers of neurons interconnected by synapses. The only neurons that are directly sensitive to light are the photoreceptor cells. These are mainly of two types: the rods and cones. Rods function mainly in dim light and provide black-and-white vision, while cones support daytime vision and the perception of colour. A third, much rarer type of photoreceptor, the intrinsically photosensitive ganglion cell, is important for reflexive responses to bright daylight.Neural signals from the rods and cones undergo processing by other neurons of the retina. The output takes the form of action potentials in retinal ganglion cells whose axons form the optic nerve. Several important features of visual perception can be traced to the retinal encoding and processing of light.