circulation – Copy
... 2. Choroidal blood flow is 20 times greater than that of retina. 3. Choroidal blood flow is the highest of any system in the body. 4. The choroidal circulation supplies 80% of the retina (outer 130 mm – up to the outer part of the inner nuclear layer), while the retinal vessels supply only 20%.When ...
... 2. Choroidal blood flow is 20 times greater than that of retina. 3. Choroidal blood flow is the highest of any system in the body. 4. The choroidal circulation supplies 80% of the retina (outer 130 mm – up to the outer part of the inner nuclear layer), while the retinal vessels supply only 20%.When ...
CRAO
... Unlike the rather wide range of "normal" values seen with an ESR, the range of "normal" serum C-reactive protein levels is smaller and does not vary by age. Obtaining both ESR and C-reactive protein levels improves the sensitivity and specificity of a giant cell arteritis diagnosis. Elevated platele ...
... Unlike the rather wide range of "normal" values seen with an ESR, the range of "normal" serum C-reactive protein levels is smaller and does not vary by age. Obtaining both ESR and C-reactive protein levels improves the sensitivity and specificity of a giant cell arteritis diagnosis. Elevated platele ...
The Eye in Behcet`s disease
... the presence of inflammatory cells in the jelly gives rise to little black specks clouding the vision (floaters) which, if dense, can significantly reduce vision. In addition the inflammation affects the blood vessels that supply the retina (the light sensing tissue lining the back of the eye). As a ...
... the presence of inflammatory cells in the jelly gives rise to little black specks clouding the vision (floaters) which, if dense, can significantly reduce vision. In addition the inflammation affects the blood vessels that supply the retina (the light sensing tissue lining the back of the eye). As a ...
What is Perception?
... neurons, the bipolar cells Ganglion cells: Collected messages from the bipolar cells are passed along to the third layer of neurons, the ganglion cells. Fovea: The highly sensitive region of the retina responsible for precise, focused vision, composed largely of cones ...
... neurons, the bipolar cells Ganglion cells: Collected messages from the bipolar cells are passed along to the third layer of neurons, the ganglion cells. Fovea: The highly sensitive region of the retina responsible for precise, focused vision, composed largely of cones ...
Chapter 8: Special Senses - River Valley Local Schools
... tones in dim light. They are responsible for our peripheral vision. Vitamin A is important for rod maintenance. Cones allow us to see color in bright light, are most dense near the center of the retina. The fovea centralis, lateral to each blind spot only contains cones. This is the area of greatest ...
... tones in dim light. They are responsible for our peripheral vision. Vitamin A is important for rod maintenance. Cones allow us to see color in bright light, are most dense near the center of the retina. The fovea centralis, lateral to each blind spot only contains cones. This is the area of greatest ...
The potential usefulness to research of retina obtained by
... and embedded in Lowicryl K4M (Polysciences, Warrington, PA). The Lowicryl was polymerized with ultraviolet light for 24 hr at 4°C and additionally for 48 hr at room temperature. After washing in 0.1 M phosphate buffer (pH 7.4) and blocking with 4% bovine serum albumin (BSA) in phosphate buffer, sect ...
... and embedded in Lowicryl K4M (Polysciences, Warrington, PA). The Lowicryl was polymerized with ultraviolet light for 24 hr at 4°C and additionally for 48 hr at room temperature. After washing in 0.1 M phosphate buffer (pH 7.4) and blocking with 4% bovine serum albumin (BSA) in phosphate buffer, sect ...
10_Instruments for research and correction of the human eye
... • Because of their different functions, rods and cones are present in varying densities in the retina. The blind spot is due to the connection of the optic nerve ...
... • Because of their different functions, rods and cones are present in varying densities in the retina. The blind spot is due to the connection of the optic nerve ...
Part a
... (a) Diagrammatic view. The vitreous humor is illustrated only in the bottom part of the eyeball. Copyright © 2010 Pearson Education, Inc. ...
... (a) Diagrammatic view. The vitreous humor is illustrated only in the bottom part of the eyeball. Copyright © 2010 Pearson Education, Inc. ...
Chapter 15 PowerPoint
... (a) Diagrammatic view. The vitreous humor is illustrated only in the bottom part of the eyeball. Copyright © 2010 Pearson Education, Inc. ...
... (a) Diagrammatic view. The vitreous humor is illustrated only in the bottom part of the eyeball. Copyright © 2010 Pearson Education, Inc. ...
ch_15_lecture_outline_a
... (a) Diagrammatic view. The vitreous humor is illustrated only in the bottom part of the eyeball. Copyright © 2010 Pearson Education, Inc. ...
... (a) Diagrammatic view. The vitreous humor is illustrated only in the bottom part of the eyeball. Copyright © 2010 Pearson Education, Inc. ...
Intra ocular Tumours Associate Professor Polkinghorne Learning
... distinguished from iris melanoma by being flat and small. They don’t usually distort the pupil and by definition rarely enlarge. Choroidal naevi are also distinguishable from choroidal melanoma, sharing similar characteristics. Large choroidal melanoma are typically elevated, with lipofuscin present ...
... distinguished from iris melanoma by being flat and small. They don’t usually distort the pupil and by definition rarely enlarge. Choroidal naevi are also distinguishable from choroidal melanoma, sharing similar characteristics. Large choroidal melanoma are typically elevated, with lipofuscin present ...
A Case of Unusual Retinal Hemorrhages Stanley
... dilation to more aggressive retinal or optic disc neovascularization and vitreous hemorrhage. Factors contributing to the development of retinal hemorrhages in blood dyscrasias include anemia, thrombocytopenia, leukocytosis, and blood or serum hyperviscosity, which can affect the fragile retinal cap ...
... dilation to more aggressive retinal or optic disc neovascularization and vitreous hemorrhage. Factors contributing to the development of retinal hemorrhages in blood dyscrasias include anemia, thrombocytopenia, leukocytosis, and blood or serum hyperviscosity, which can affect the fragile retinal cap ...
Optic Nerve Hypoplasia
... With Optic Nerve Hypoplasia photophobia and a nystagmus may occur. As the brain matures there may be a mild improvement in visual function and in some cases, reduced nystagmus may also occur. A person with Optic Nerve Hypoplasia has optic nerves which are small and poorly developed. Instead of havin ...
... With Optic Nerve Hypoplasia photophobia and a nystagmus may occur. As the brain matures there may be a mild improvement in visual function and in some cases, reduced nystagmus may also occur. A person with Optic Nerve Hypoplasia has optic nerves which are small and poorly developed. Instead of havin ...
SENSATION & PERCEPTION
... is none sometimes.) The beauty of this is that it allows us to attend to informative changes in our environment and to not be distracted by the uninformative. Once you have “adapted” you can’t return to your original state of sensitivity. • Habituation: the weakening of a response to a stimulus, or ...
... is none sometimes.) The beauty of this is that it allows us to attend to informative changes in our environment and to not be distracted by the uninformative. Once you have “adapted” you can’t return to your original state of sensitivity. • Habituation: the weakening of a response to a stimulus, or ...
1 Measurement of PO2 during vitrectomy for central retinal vein
... retina, ciliary body, lens and aqueous, all of which may provide diffusion of O2 molecules into the vitreous. If the source of O2 is from the retina this is consistent with a reduced retinal blood supply in these patients, as detected on fluorescein angiography and Doppler studies 9. Other condition ...
... retina, ciliary body, lens and aqueous, all of which may provide diffusion of O2 molecules into the vitreous. If the source of O2 is from the retina this is consistent with a reduced retinal blood supply in these patients, as detected on fluorescein angiography and Doppler studies 9. Other condition ...
HP3213501362
... eyes using the natural way of the light: light is directed through the pupil to the retina and the fundus with its normal and abnormal parts can be observed from the reflected light. CR4-45NM camera Non-Mydriatic Retinal Camera is used . The 35 mm camera body should be attached to the main unit and ...
... eyes using the natural way of the light: light is directed through the pupil to the retina and the fundus with its normal and abnormal parts can be observed from the reflected light. CR4-45NM camera Non-Mydriatic Retinal Camera is used . The 35 mm camera body should be attached to the main unit and ...
HL16 Eye Aspects of Craniofacial Conditions.pub
... deviations of the eyes can be seen. Most commonly the children show a ‘V’ pattern of eye movements, in which the eyes tend to be divergent in the up-gaze, less divergent in the straight ahead position and less divergent still (or even convergent) in down-gaze. Very often excyclorotation (outward rot ...
... deviations of the eyes can be seen. Most commonly the children show a ‘V’ pattern of eye movements, in which the eyes tend to be divergent in the up-gaze, less divergent in the straight ahead position and less divergent still (or even convergent) in down-gaze. Very often excyclorotation (outward rot ...
I. Case History Demographics 59-year
... and signs typically appear within hours to days of the precipitating event. An intraocular hemorrhage may be apparent on CT scan, though definitive diagnosis should be made with fundoscopy. TS has a good visual prognosis with most cases showing spontaneous resolution over a course of weeks, although ...
... and signs typically appear within hours to days of the precipitating event. An intraocular hemorrhage may be apparent on CT scan, though definitive diagnosis should be made with fundoscopy. TS has a good visual prognosis with most cases showing spontaneous resolution over a course of weeks, although ...
ppt - Click here to
... white area devoid of blood vessels in the inferior fundus Large Coloboma may involve the disc and give rise to leucokoria Complication: Retinal detachment ...
... white area devoid of blood vessels in the inferior fundus Large Coloboma may involve the disc and give rise to leucokoria Complication: Retinal detachment ...
The regulatory role of hepatoma-derived growth
... in Figure 1B. Mouse total brain homogenate and purified HDGF were used as positive controls. The results indicated that HDGF is expressed in the retina and the brain at a similar level. Immunohistochemistry detected HDGF expression in multiple layers of the retina (Figure 1C). The HDGF signal is pre ...
... in Figure 1B. Mouse total brain homogenate and purified HDGF were used as positive controls. The results indicated that HDGF is expressed in the retina and the brain at a similar level. Immunohistochemistry detected HDGF expression in multiple layers of the retina (Figure 1C). The HDGF signal is pre ...
BIO 218 F 2012 CH 18 Martini Lecture Outline
... Light waves pass through the cornea Pass through the anterior chamber Pass through the pupil Pass through the posterior chamber Pass through the lens The lens focuses the image on some part of the retina This creates a depolarization of the neural cells Signal is transmitted to the brain via CN II ...
... Light waves pass through the cornea Pass through the anterior chamber Pass through the pupil Pass through the posterior chamber Pass through the lens The lens focuses the image on some part of the retina This creates a depolarization of the neural cells Signal is transmitted to the brain via CN II ...
Biology 218 – Human Anatomy Lecture Outline Adapted from Martini
... Light waves pass through the cornea Pass through the anterior chamber Pass through the pupil Pass through the posterior chamber Pass through the lens The lens focuses the image on some part of the retina This creates a depolarization of the neural cells Signal is transmitted to the brain via CN II ...
... Light waves pass through the cornea Pass through the anterior chamber Pass through the pupil Pass through the posterior chamber Pass through the lens The lens focuses the image on some part of the retina This creates a depolarization of the neural cells Signal is transmitted to the brain via CN II ...
Fundus Autofluorescence Imaging with the Confocal Scanning
... precise plane of focus (here, the retinal pigment epithelium) can pass through the pinhole and reach the detector. In contrast, light originating in the light beam but out of the focal plane is blocked. Middle row right: The Heidelberg Retina Angiograph (HRA 2) with laser scanning camera, imaged fro ...
... precise plane of focus (here, the retinal pigment epithelium) can pass through the pinhole and reach the detector. In contrast, light originating in the light beam but out of the focal plane is blocked. Middle row right: The Heidelberg Retina Angiograph (HRA 2) with laser scanning camera, imaged fro ...
Avastin.for.RVO
... (top) with a VA of 20/70. After two injections of Avastin, there was less subretinal fluid (middle) and VA was 20/60. After continued treatment, there was persistent CME and VA was still 20/60. However, after three more injections, the CME decreased, and VA was 20/40. ...
... (top) with a VA of 20/70. After two injections of Avastin, there was less subretinal fluid (middle) and VA was 20/60. After continued treatment, there was persistent CME and VA was still 20/60. However, after three more injections, the CME decreased, and VA was 20/40. ...
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.