OCT * What We Can See
... Review of Retinal Anatomy Review Normal Retinal OCT Review of Optic Nerve Anatomy Review of Normal ONH OCT Review of Corneal Anatomy Review of Normal Corneal OCT Review of Angle Anatomy Review of Normal Angle OCT Case Studies of Abnormal OCTs ...
... Review of Retinal Anatomy Review Normal Retinal OCT Review of Optic Nerve Anatomy Review of Normal ONH OCT Review of Corneal Anatomy Review of Normal Corneal OCT Review of Angle Anatomy Review of Normal Angle OCT Case Studies of Abnormal OCTs ...
File - BINZHOU MEDICAL UNIVERSITY
... Cone cells are color receptors that function best during the day Rod cells are dark-light receptors that function best at night and in dim light ...
... Cone cells are color receptors that function best during the day Rod cells are dark-light receptors that function best at night and in dim light ...
Dr Ziai chronic visual loss_compressed
... of the retina is supplied by the central retinal artery (branch of the ophthalmic artery, which is the first branch of the ICA) if this supply is interrupted (embolus, thrombosis, inflammation, vasculitis or compression), the retina becomes ischemic irreversible damage occurs after approximately ...
... of the retina is supplied by the central retinal artery (branch of the ophthalmic artery, which is the first branch of the ICA) if this supply is interrupted (embolus, thrombosis, inflammation, vasculitis or compression), the retina becomes ischemic irreversible damage occurs after approximately ...
7-1 CHAPTER 7 VISION hotoreception is a particularly important
... Figure 7-5A, results when the length of eye is too short for the refractive power of the lens; this can result from having too short an eyeball or too weak a lens system. When a weak lens system results from age-related changes in the lens itself, the condition is presbyopia. The hyperopic eye sees ...
... Figure 7-5A, results when the length of eye is too short for the refractive power of the lens; this can result from having too short an eyeball or too weak a lens system. When a weak lens system results from age-related changes in the lens itself, the condition is presbyopia. The hyperopic eye sees ...
Myopia – or nearsightedness
... If an object was placed at 25cm from your eye and a clear image forms on your retina located 2.5cm behind your lens, what is the focal length of your eye? In a near-sighted eye your lens no longer has the ability to change its focal length so that objects located far away can be focused clearly on t ...
... If an object was placed at 25cm from your eye and a clear image forms on your retina located 2.5cm behind your lens, what is the focal length of your eye? In a near-sighted eye your lens no longer has the ability to change its focal length so that objects located far away can be focused clearly on t ...
Proton irradiation of simulated ocular tumors.
... loosening of the scleral suture. The dose delivered to the ocular target and adjacent tissues by the 7 mm. beam, when the Bragg peak was positioned on the tantalum clip within the scleral sponge is shown by the isodose lines superimposed on a scale drawing of the owl monkey eye and orbit (Fig. 5). T ...
... loosening of the scleral suture. The dose delivered to the ocular target and adjacent tissues by the 7 mm. beam, when the Bragg peak was positioned on the tantalum clip within the scleral sponge is shown by the isodose lines superimposed on a scale drawing of the owl monkey eye and orbit (Fig. 5). T ...
The Human Eye
... can no longer make the lenses change _____________. This occurs as a person ages. People with presbyopia cannot focus on _____________ objects. If someone was already ___________________ and they get presbyopia, they can not focus on distant or nearby objects. To correct this problem, people wear __ ...
... can no longer make the lenses change _____________. This occurs as a person ages. People with presbyopia cannot focus on _____________ objects. If someone was already ___________________ and they get presbyopia, they can not focus on distant or nearby objects. To correct this problem, people wear __ ...
Retinal break or tear
... Acute retinal breaks are usually associated with symptoms, with flashing lights (photopsia), often in the periphery; one or more floaters of recent onset, or there may be a recent history of head or ocular trauma. However, chronic retinal breaks or atrophic holes may not cause symptoms. Signs Breaks ...
... Acute retinal breaks are usually associated with symptoms, with flashing lights (photopsia), often in the periphery; one or more floaters of recent onset, or there may be a recent history of head or ocular trauma. However, chronic retinal breaks or atrophic holes may not cause symptoms. Signs Breaks ...
Things about the Eye that every Internist should know COLD!!!
... Retinal Disease • Central Retinal Artery Occlusion – 90 minutes to save perfusion – Ocular massage (press on globe for 10 sec and release for 10 sec, repeated over approx 5 min) – Ophthalmologist will sometimes give tPA if seen within 90 minutes, AC tap to lower IOP (why?) – Time is retina!!! ...
... Retinal Disease • Central Retinal Artery Occlusion – 90 minutes to save perfusion – Ocular massage (press on globe for 10 sec and release for 10 sec, repeated over approx 5 min) – Ophthalmologist will sometimes give tPA if seen within 90 minutes, AC tap to lower IOP (why?) – Time is retina!!! ...
Tran, C
... 2. In animal studies, it has shown that glutamate receptor inhibitors have increased visual outcome by noncompetitively blocking glutamate released from apoptotic cells from inducing death of adjacent cells 3. Treatment for TON varies based on each patient’s case - considerations include risks of s ...
... 2. In animal studies, it has shown that glutamate receptor inhibitors have increased visual outcome by noncompetitively blocking glutamate released from apoptotic cells from inducing death of adjacent cells 3. Treatment for TON varies based on each patient’s case - considerations include risks of s ...
ASSESSING THE EYES
... Retina: inner layer; receives light waves that are sent to brain and converted into visible perceptions Macula: an indistinct, darker, avscular area on the retina responsible for night, color, and central vision and motion detection ...
... Retina: inner layer; receives light waves that are sent to brain and converted into visible perceptions Macula: an indistinct, darker, avscular area on the retina responsible for night, color, and central vision and motion detection ...
Fact: FALSE.
... vision. If you look through a toilet tissue tube your vision is restricted to less then 20 degrees. You can have 20/20 vision with a visual field of less then 20 degrees and be considered legally blind. ...
... vision. If you look through a toilet tissue tube your vision is restricted to less then 20 degrees. You can have 20/20 vision with a visual field of less then 20 degrees and be considered legally blind. ...
Zachary Roth
... temporal retina and there are more crossed than uncrossed fibers with the proportion of decussating and non-decussating fibers estimated to be 53:47. As a result, each optic tract contains more pupillomotor input from the contralateral eye and lesions will result in a contralateral RAPD. The classic ...
... temporal retina and there are more crossed than uncrossed fibers with the proportion of decussating and non-decussating fibers estimated to be 53:47. As a result, each optic tract contains more pupillomotor input from the contralateral eye and lesions will result in a contralateral RAPD. The classic ...
Sensory physiology lecture
... and amacrine cells that the action potentials are generated. This is then sent to the optical nerve and from there, to the visual cortex of the brain. Slide #41: Scanning electron micrograph and drawing showing the structure of the retina and its component cells. Slide #42: Retinal cells: Action pot ...
... and amacrine cells that the action potentials are generated. This is then sent to the optical nerve and from there, to the visual cortex of the brain. Slide #41: Scanning electron micrograph and drawing showing the structure of the retina and its component cells. Slide #42: Retinal cells: Action pot ...
Proton irradiation of simulated ocular tumors.
... loosening of the scleral suture. The dose delivered to the ocular target and adjacent tissues by the 7 mm. beam, when the Bragg peak was positioned on the tantalum clip within the scleral sponge is shown by the isodose lines superimposed on a scale drawing of the owl monkey eye and orbit (Fig. 5). T ...
... loosening of the scleral suture. The dose delivered to the ocular target and adjacent tissues by the 7 mm. beam, when the Bragg peak was positioned on the tantalum clip within the scleral sponge is shown by the isodose lines superimposed on a scale drawing of the owl monkey eye and orbit (Fig. 5). T ...
Unit 4: Sensation and Perception
... Rods = retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don’t respond. ...
... Rods = retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don’t respond. ...
Glossary ()
... Ophthalmic: pertaining to the eye, particularly medical aspects Ophthalmoscope: instrument used to view inside the eye; direct o.: a lighted handscope magnifier, used primarily to see the optic nerve and macula; indirect o.: a handheld lens is viewed from a lighted telescopic headset, used primarily ...
... Ophthalmic: pertaining to the eye, particularly medical aspects Ophthalmoscope: instrument used to view inside the eye; direct o.: a lighted handscope magnifier, used primarily to see the optic nerve and macula; indirect o.: a handheld lens is viewed from a lighted telescopic headset, used primarily ...
Electroretinographic analysis of retinal function in mice
... pass their information via graded potentials, an electrical potential that can vary continuously in amplitude, meaning that photoreceptors do not respond in all-or-nothing fashion in order to communicate the number of photons being absorbed by them. Ganglion cells on the other hand, ...
... pass their information via graded potentials, an electrical potential that can vary continuously in amplitude, meaning that photoreceptors do not respond in all-or-nothing fashion in order to communicate the number of photons being absorbed by them. Ganglion cells on the other hand, ...
Text, Graphics, symbols, and codes
... on the two retinas are in corresponding positions to get the impression of a single object (the images are fused). •Convergence is controlled by the muscles surrounding the eyeball. Some individuals tend to converge to much and others tend not to converge enough. These two conditions are called phor ...
... on the two retinas are in corresponding positions to get the impression of a single object (the images are fused). •Convergence is controlled by the muscles surrounding the eyeball. Some individuals tend to converge to much and others tend not to converge enough. These two conditions are called phor ...
Capability of the human visual system
... The iris, a thin diaphragm lying between the cornea and the crystalline lens, controls the entry oflight into the eye and functions similarly to the aperture stop and shutter in a camera. The pupil, a variable diameter opening within the iris, determines the amount oflight that passes through to th ...
... The iris, a thin diaphragm lying between the cornea and the crystalline lens, controls the entry oflight into the eye and functions similarly to the aperture stop and shutter in a camera. The pupil, a variable diameter opening within the iris, determines the amount oflight that passes through to th ...
What is age-related macular degeneration (AMD) and who`s at risk?
... photoreceptors are most dense. Like a camera, the retina is the film of the eye that receives images from the other ocular structures. The retina then sends impulses to the brain for interpretation. The macula provides us with central vision and allows us to see fine details such as those on faces, ...
... photoreceptors are most dense. Like a camera, the retina is the film of the eye that receives images from the other ocular structures. The retina then sends impulses to the brain for interpretation. The macula provides us with central vision and allows us to see fine details such as those on faces, ...
Gyrate Atrophy: A Study in a Degenerative Eye
... Although orinthine isn’t used as an amino acid in humans, plants use it a great deal. Because of their function as germinating bodies, legumes have a large pool of energy storing molecules. Specifically, legumes store their energy as proteins. The proteins in the storage structures of the plant mate ...
... Although orinthine isn’t used as an amino acid in humans, plants use it a great deal. Because of their function as germinating bodies, legumes have a large pool of energy storing molecules. Specifically, legumes store their energy as proteins. The proteins in the storage structures of the plant mate ...
Retinal vessel photocoagulation: a quantitative comparison
... The krypton red line, which is effective in photocoagulating the outer retina and choroid, 3 " 6 was not included in this study because of its poor absorption by hemoglobin. The blue argon wavelength (488 nm) was also excluded because of (1) its preferential scattering by the ocular media, (2) its a ...
... The krypton red line, which is effective in photocoagulating the outer retina and choroid, 3 " 6 was not included in this study because of its poor absorption by hemoglobin. The blue argon wavelength (488 nm) was also excluded because of (1) its preferential scattering by the ocular media, (2) its a ...
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.