Session 161 Posterior segment mechanisms and functions
... Contracted TE-stromas were 133.44 ± 39.44 μm thick. UTS TE-stromas was three times as high as the control whereas ETE-stromas was 12 times as low. Conclusions: At least a 10 minute-wait should be allowed after cutting the TE-stroma before grafting, in order to avoid generating retinal detachment. Th ...
... Contracted TE-stromas were 133.44 ± 39.44 μm thick. UTS TE-stromas was three times as high as the control whereas ETE-stromas was 12 times as low. Conclusions: At least a 10 minute-wait should be allowed after cutting the TE-stroma before grafting, in order to avoid generating retinal detachment. Th ...
Chapter 20 (Ocular Fluid).
... 1. Aqueous humor is produced by the ciliary body epithelium in the posterior chamber and flows into the anterior chamber 2. The aqueous exits the eye either through ...
... 1. Aqueous humor is produced by the ciliary body epithelium in the posterior chamber and flows into the anterior chamber 2. The aqueous exits the eye either through ...
DISSECTING A COW`S EYE
... Scoop out the vitreous body from the globe of the eye. Then, for better viewing, cut the sclera & turn the eye inside-out. __ Below the retina lies the choroid. In cows and many other animals, there is a tapetum - a highly reflective layer of tissue within the choroid that is a blue-green, iridescen ...
... Scoop out the vitreous body from the globe of the eye. Then, for better viewing, cut the sclera & turn the eye inside-out. __ Below the retina lies the choroid. In cows and many other animals, there is a tapetum - a highly reflective layer of tissue within the choroid that is a blue-green, iridescen ...
Cow Eye Dissection
... Scoop out the vitreous body from the globe of the eye. Then, for better viewing, cut the sclera & turn the eye inside-out. __ Below the retina lies the choroid. In cows and many other animals, there is a tapetum - a highly reflective layer of tissue within the choroid that is a blue-green, iridescen ...
... Scoop out the vitreous body from the globe of the eye. Then, for better viewing, cut the sclera & turn the eye inside-out. __ Below the retina lies the choroid. In cows and many other animals, there is a tapetum - a highly reflective layer of tissue within the choroid that is a blue-green, iridescen ...
Comparison of retinal nerve fiber layer thickness between normal
... reaction was because by mechanical injury of phacoemulsification surgery [21, 22]; traction reaction of optic nerve head induced by parts of vitreous liquefaction in ultrasonic emulsification process [23]; with the addition of optic neuropathy from ultrasonic energy [24]. For all above, these factor ...
... reaction was because by mechanical injury of phacoemulsification surgery [21, 22]; traction reaction of optic nerve head induced by parts of vitreous liquefaction in ultrasonic emulsification process [23]; with the addition of optic neuropathy from ultrasonic energy [24]. For all above, these factor ...
Differential temporal and spatial expression of insulin-like
... buds. In the eye, IGFBP-2 mRNA is expressed only in the presumptive corneal epithelium at this time. By E6, IGFBP-2 mRNA expression is present in both the corneal epithelium and endothelium. By El2, IGFBP-2 mRNA is detected clearly in the corneal stroma as well as in several other ocular structures, ...
... buds. In the eye, IGFBP-2 mRNA is expressed only in the presumptive corneal epithelium at this time. By E6, IGFBP-2 mRNA expression is present in both the corneal epithelium and endothelium. By El2, IGFBP-2 mRNA is detected clearly in the corneal stroma as well as in several other ocular structures, ...
Increased levels of extracellular ATP in glaucomatous retinas
... Purpose: To study retinal extracellular ATP levels and to assess the changes in the vesicular nucleotide transporter (VNUT) expression in a murine model of glaucoma during the development of the disease. Methods: Retinas were obtained from glaucomatous DBA/2J mice at 3, 9, 15, and 22 months together ...
... Purpose: To study retinal extracellular ATP levels and to assess the changes in the vesicular nucleotide transporter (VNUT) expression in a murine model of glaucoma during the development of the disease. Methods: Retinas were obtained from glaucomatous DBA/2J mice at 3, 9, 15, and 22 months together ...
2320Lecture12
... fused into a single image • The region of space that contains images with close enough disparity to be fused is called Panum’s Area ...
... fused into a single image • The region of space that contains images with close enough disparity to be fused is called Panum’s Area ...
Distinguishing Characteristics of Primary Retinal Vasculitis from
... vasculitis is often closely aligned with Eales disease. Eales disease is also associated with isolated conditions of retinal vasculitis, most often seen in young men. Characteristic features include inflammation of the peripheral retinal vasculature causing retinal phlebitis that can lead to retinal ...
... vasculitis is often closely aligned with Eales disease. Eales disease is also associated with isolated conditions of retinal vasculitis, most often seen in young men. Characteristic features include inflammation of the peripheral retinal vasculature causing retinal phlebitis that can lead to retinal ...
The Eye Examination 1 - Stony Brook University School of Medicine
... extends to the retina. The cavity is filled with a transparent jellylike material called vitreous humor. Retina The neural tissue lining the vitreous cavity posteriorly. Essentially transparent except for the blood vessels on its inner surface, the retina sends the initial visu ...
... extends to the retina. The cavity is filled with a transparent jellylike material called vitreous humor. Retina The neural tissue lining the vitreous cavity posteriorly. Essentially transparent except for the blood vessels on its inner surface, the retina sends the initial visu ...
Vision - Kansas State University
... chose “Light Rays in the Eye.” Set the object at some small distance from the eye. Then, adjust the lens inside the eye so that the object focuses sharply on the retina. Now move the object slightly so that the image is slightly less than sharp. To bring it back to sharp, move the back of the eye. A ...
... chose “Light Rays in the Eye.” Set the object at some small distance from the eye. Then, adjust the lens inside the eye so that the object focuses sharply on the retina. Now move the object slightly so that the image is slightly less than sharp. To bring it back to sharp, move the back of the eye. A ...
Central retinal vein occlusion – A patient with systemic
... Rheumatology include major and minor criteria. Major criteria consist of anterior scleroderma (thickening of the skin) affecting the arms, face, and/ or neck, while minor criteria include digital pitting scars or the loss of the volar pads of the finger tips, pulmonary fibrosis and sclerodactyly (sc ...
... Rheumatology include major and minor criteria. Major criteria consist of anterior scleroderma (thickening of the skin) affecting the arms, face, and/ or neck, while minor criteria include digital pitting scars or the loss of the volar pads of the finger tips, pulmonary fibrosis and sclerodactyly (sc ...
The use of optical coherence tomography in neuro
... OCT is widely reported. Not surprisingly, there is PRNFL thinning after optic neuritis. More interestingly, even in the eyes of multiple sclerosis patients with no prior history of optic neuritis, the PRNFL is thin.19 PRNFL thinning has also been reported in Alzheimer’s and Parkinson’s disease.20 Su ...
... OCT is widely reported. Not surprisingly, there is PRNFL thinning after optic neuritis. More interestingly, even in the eyes of multiple sclerosis patients with no prior history of optic neuritis, the PRNFL is thin.19 PRNFL thinning has also been reported in Alzheimer’s and Parkinson’s disease.20 Su ...
Walls (1962) Evolutionary history of eye movements
... “fixation” and “pursuit” reflexes; and there is no good reason not to call the reflex component of convergence “psycho-optic” (and the accommodation reflex as well, if its arc does include Area 17). The obvious motor elements in Area 17 for some or all of these arcs are the cells of Meynert, whose a ...
... “fixation” and “pursuit” reflexes; and there is no good reason not to call the reflex component of convergence “psycho-optic” (and the accommodation reflex as well, if its arc does include Area 17). The obvious motor elements in Area 17 for some or all of these arcs are the cells of Meynert, whose a ...
the challenges of ophthalmic drug delivery: a review
... The BAB allows small lipophilic drugs to enter the uveal blood circulation and, consequently, facilitates their rapid elimination from the anterior chamber. In contrast, larger and more hydrophilic drugs are merely eliminated by aqueous humor turnover across the BAB [20]. Blood-Retinal Barrier: The ...
... The BAB allows small lipophilic drugs to enter the uveal blood circulation and, consequently, facilitates their rapid elimination from the anterior chamber. In contrast, larger and more hydrophilic drugs are merely eliminated by aqueous humor turnover across the BAB [20]. Blood-Retinal Barrier: The ...
Acute Inflammation and Loss of Retinal Architecture and Function
... shown that antibiotics effectively kill intraocular organisms, and anti-inflammatory agents are occasionally successful in suppressing the intraocular inflammatory response.1–6 In similar experimental models, some of the important toxins involved in the virulence of endophthalmitis pathogens have also ...
... shown that antibiotics effectively kill intraocular organisms, and anti-inflammatory agents are occasionally successful in suppressing the intraocular inflammatory response.1–6 In similar experimental models, some of the important toxins involved in the virulence of endophthalmitis pathogens have also ...
10-Trauma (dr amani badawi
... Vossius ring: A circle of iris pigment on the anterior lens capsule due to the impress of the pupillary border of the iris on the lens. Anterior and posterior cortical opacities: Posterior cortical cataract is more common, as the posterior capsule is thinner than the anterior capsule and more vu ...
... Vossius ring: A circle of iris pigment on the anterior lens capsule due to the impress of the pupillary border of the iris on the lens. Anterior and posterior cortical opacities: Posterior cortical cataract is more common, as the posterior capsule is thinner than the anterior capsule and more vu ...
Matthew Berrios
... Management: Necessary to find object causing discomfort. Can be flushed out using saline solution. Refrain from rubbing or scratching. Use moist cotton applicator to remove object Comments: ~ Foreign objects may lead to corneal abrasions – heal on own in 1-2 days Extra Fact: ~ Foreign bodies are not ...
... Management: Necessary to find object causing discomfort. Can be flushed out using saline solution. Refrain from rubbing or scratching. Use moist cotton applicator to remove object Comments: ~ Foreign objects may lead to corneal abrasions – heal on own in 1-2 days Extra Fact: ~ Foreign bodies are not ...
Welch Allyn Direct and Indirect Veterinary Eye and Ear Examination
... The ear drum can usually be seen in normal dogs less than one year of age. It may be difficult to visualize the eardrum in older dogs because the meatus has narrowed, because the tense part of the eardrum is obscured by the flaccid part, because the lining of the meatus obscures the eardrum or beca ...
... The ear drum can usually be seen in normal dogs less than one year of age. It may be difficult to visualize the eardrum in older dogs because the meatus has narrowed, because the tense part of the eardrum is obscured by the flaccid part, because the lining of the meatus obscures the eardrum or beca ...
Computer measurement of retinal nerve fiber layer
... computerized densitometry. 4 They used a variability measure defined as the mean of absolute differences between adjacent density values along arcs concentric with the optic disk as a measure of RNFL atrophy. This measure is highly sensitive to contrast and luminance changes between images. We have ...
... computerized densitometry. 4 They used a variability measure defined as the mean of absolute differences between adjacent density values along arcs concentric with the optic disk as a measure of RNFL atrophy. This measure is highly sensitive to contrast and luminance changes between images. We have ...
- Ingineeri.com
... contains 512 A-scans, whereas the fast 6 mm scan contains only 128 A-scans, resulting in a lower resolution image ...
... contains 512 A-scans, whereas the fast 6 mm scan contains only 128 A-scans, resulting in a lower resolution image ...
refractive media
... the cornea, aqueous humor, lens, and vitreous humor. • This system is responsible for refraction of light that fall on it onto a point on the retina Physiology of Special senses, Abdelaziz Hussein ...
... the cornea, aqueous humor, lens, and vitreous humor. • This system is responsible for refraction of light that fall on it onto a point on the retina Physiology of Special senses, Abdelaziz Hussein ...
relation of macular and other holes to the insertion of the inferior
... "The m. obliquus inferior has the shortest tendon of all the eye muscles (often practically none at all). One therefore, often sees cross-sections of muscle-fibres clinging to the outer surface of the sclera on the temporal side in horizontal sections through the posterior half of the eye; they belo ...
... "The m. obliquus inferior has the shortest tendon of all the eye muscles (often practically none at all). One therefore, often sees cross-sections of muscle-fibres clinging to the outer surface of the sclera on the temporal side in horizontal sections through the posterior half of the eye; they belo ...
Perfluorocarbon Liquid-Assisted External Drainage in the
... occur as a result of central serous chorioretinopathy (CSCR). Typical CSCR generally affects healthy middle-aged males and is characterized by localized serous RD of the neurosensory retina and retinal pigment epithelium in the macula that often spontaneously improve within 2 to 3 months. On rare oc ...
... occur as a result of central serous chorioretinopathy (CSCR). Typical CSCR generally affects healthy middle-aged males and is characterized by localized serous RD of the neurosensory retina and retinal pigment epithelium in the macula that often spontaneously improve within 2 to 3 months. On rare oc ...
Reid (D)
... Thus two factors argue against poor optics or retinal immaturity as the cause of immature geniculate receptive-field shapes19: first, these ganglion-cell receptive fields were smaller relative to most comparably aged geniculate receptive fields (Fig. 3) and, second, their shapes were adult-like (Gau ...
... Thus two factors argue against poor optics or retinal immaturity as the cause of immature geniculate receptive-field shapes19: first, these ganglion-cell receptive fields were smaller relative to most comparably aged geniculate receptive fields (Fig. 3) and, second, their shapes were adult-like (Gau ...
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.