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Proliferative diabetic retinopathy
... the office after numbing medicines are given. The anti-VEGF medication has a temporary effect and may need to be repeated periodically depending on the response to treatment. This treatment is sometimes used prior to vitrectomy surgery or in combination with laser. ...
... the office after numbing medicines are given. The anti-VEGF medication has a temporary effect and may need to be repeated periodically depending on the response to treatment. This treatment is sometimes used prior to vitrectomy surgery or in combination with laser. ...
Ocular migraines
... The symptoms often occur in both eyes at once, and unsettle or scare patients. They constrain sufferers in the workplace and sometimes even leave them incapable of working until the symptoms subside. Research into the causes is based on shortcomings in our nervous system. Hormones play a role, as d ...
... The symptoms often occur in both eyes at once, and unsettle or scare patients. They constrain sufferers in the workplace and sometimes even leave them incapable of working until the symptoms subside. Research into the causes is based on shortcomings in our nervous system. Hormones play a role, as d ...
Laser Eye and Skin hazards
... The cornea, lens and vitreous fluid are transparent to light of these wavelengths but it is absorbed by retinal tissue. Damage to the retinal tissue occurs by absorption of light and its conversion to heat by the melanin granules in the pigmented epithelium or by photochemical action to the photorec ...
... The cornea, lens and vitreous fluid are transparent to light of these wavelengths but it is absorbed by retinal tissue. Damage to the retinal tissue occurs by absorption of light and its conversion to heat by the melanin granules in the pigmented epithelium or by photochemical action to the photorec ...
Speciality clinics investigation
... In vacuities case when there is NVD, NVE Peripheral PRP is done. In diabetic Retinopathy cases additional laser is done. ...
... In vacuities case when there is NVD, NVE Peripheral PRP is done. In diabetic Retinopathy cases additional laser is done. ...
File
... loss associated with degeneration of nerve tissue in the ear and the vestibulocochlear nerve. A similar type of hearing loss can occur after chronic exposure to loud noises which damage the receptors in the Organ of Corti. Cochlear implants may help improve hearing. Cochlear implants are made from a ...
... loss associated with degeneration of nerve tissue in the ear and the vestibulocochlear nerve. A similar type of hearing loss can occur after chronic exposure to loud noises which damage the receptors in the Organ of Corti. Cochlear implants may help improve hearing. Cochlear implants are made from a ...
AP Unit IVB - Mater Academy Lakes High School
... b. process by which stimulus energies are changed into neural signals. c. system for sensing the position and movement of individual body parts. d. diminished sensitivity to an unchanging stimulus. e. process of organizing and interpreting sensory information. ____ 34. Which of the following sensory ...
... b. process by which stimulus energies are changed into neural signals. c. system for sensing the position and movement of individual body parts. d. diminished sensitivity to an unchanging stimulus. e. process of organizing and interpreting sensory information. ____ 34. Which of the following sensory ...
AP Unit IVA - Mater Academy Lakes High School
... c. experience the whole as different from the sum of its parts. d. are unable to adapt to an inverted visual world. e. are born with the ability to perceptually adapt. ____ 42. Kinesthesis refers to the a. quivering eye movements that enable the retina to detect continuous stimulation. b. process by ...
... c. experience the whole as different from the sum of its parts. d. are unable to adapt to an inverted visual world. e. are born with the ability to perceptually adapt. ____ 42. Kinesthesis refers to the a. quivering eye movements that enable the retina to detect continuous stimulation. b. process by ...
Ocular Albinism
... retinal vasculature to surround the fovea, and the silhouette of medium and large choroidal vessels in contrast to the sclera. These findings are consistent with ocular albinism, a category of albinism that mainly affects the eyes, with minimal to no skin involvement. ...
... retinal vasculature to surround the fovea, and the silhouette of medium and large choroidal vessels in contrast to the sclera. These findings are consistent with ocular albinism, a category of albinism that mainly affects the eyes, with minimal to no skin involvement. ...
Module - Mount Sinai Hospital
... Isolated iris colobomas may not affect visual acuity. Decreased visual acuity, photophobia, field loss often result from colobomas, depending on area that failed to develop. Congenital cataracts Wright May result from genetic/hereditary ...
... Isolated iris colobomas may not affect visual acuity. Decreased visual acuity, photophobia, field loss often result from colobomas, depending on area that failed to develop. Congenital cataracts Wright May result from genetic/hereditary ...
Student Vision Presentation
... vessels are blocked, depriving several areas of the retina with their blood supply. These areas of the retina send signals to the body to grow new blood vessels for nourishment. Proliferative Retinopathy. At this advanced stage, the signals sent by the retina for nourishment trigger the growth of ne ...
... vessels are blocked, depriving several areas of the retina with their blood supply. These areas of the retina send signals to the body to grow new blood vessels for nourishment. Proliferative Retinopathy. At this advanced stage, the signals sent by the retina for nourishment trigger the growth of ne ...
Eye Case Studies Sean Every
... People who smoke should not take beta-carotene supplements. This is the reason it is not in all AREDS supplement products. ...
... People who smoke should not take beta-carotene supplements. This is the reason it is not in all AREDS supplement products. ...
Glossary - west side eye surgery
... angioid streak – a break within Bruch’s membrane that when viewed with an ophthalmoscope resembles a branching blood vessel. Angioid streaks are found in association with pseudoxanthoma elasticum, Paget’s disease, sickle cell disease and possibly Ehler’s-Danlos syndrome. angle-closure – narrowing of ...
... angioid streak – a break within Bruch’s membrane that when viewed with an ophthalmoscope resembles a branching blood vessel. Angioid streaks are found in association with pseudoxanthoma elasticum, Paget’s disease, sickle cell disease and possibly Ehler’s-Danlos syndrome. angle-closure – narrowing of ...
Control of retinal growth and axon divergence at the chiasm: lessons
... projecting tectal axons,(39) and decussation of the corticospinal tract.(40) Recent investigations that examined the molecular nature of axon guidance at the optic chiasm in rodents have involved ephrin-A ligands. Using receptor affinity probe in situ, Marcus, Mason and colleagues found that A-type ...
... projecting tectal axons,(39) and decussation of the corticospinal tract.(40) Recent investigations that examined the molecular nature of axon guidance at the optic chiasm in rodents have involved ephrin-A ligands. Using receptor affinity probe in situ, Marcus, Mason and colleagues found that A-type ...
Eyes and Gustation
... Cataract- balance in the lens becomes disturbed and the lens loses transparency; they can result from injury, radiation, or reaction to drugs, as well as aging Glaucoma- eye disease in which the optic nerve is damaged in a ...
... Cataract- balance in the lens becomes disturbed and the lens loses transparency; they can result from injury, radiation, or reaction to drugs, as well as aging Glaucoma- eye disease in which the optic nerve is damaged in a ...
Lecture - ClassTools.Info
... Biological Motion • We are very sensitive to biological motion • An analogy: Face in object perception • Appears to require – extremely complex computations – a special motion processing mechanism ...
... Biological Motion • We are very sensitive to biological motion • An analogy: Face in object perception • Appears to require – extremely complex computations – a special motion processing mechanism ...
Ophthalmic Terminology 101 Lynn E. Konkel, MS, CPOT Heart of
... o. Choroid – the vascular (blood carrying) layer of the eye. This layer is just posterior (meaning behind) the retina and anterior to the sclera. The choroid provides nutrition to the retina. p. Retina – the nervous layer (contains nerve cells, rods and cones, that respond to light) of the eye. It ...
... o. Choroid – the vascular (blood carrying) layer of the eye. This layer is just posterior (meaning behind) the retina and anterior to the sclera. The choroid provides nutrition to the retina. p. Retina – the nervous layer (contains nerve cells, rods and cones, that respond to light) of the eye. It ...
The mechanisms involved in the transduction of light energy into
... higher pitch (and higher frequency!). However, the higher a photon’s frequency, the lower its wavelength and different retinal cells are sensitive to particular wavelengths. When photons of light, between 400 to 780nm in wavelength, enter the eye, they collide with the pigment molecules inside these ...
... higher pitch (and higher frequency!). However, the higher a photon’s frequency, the lower its wavelength and different retinal cells are sensitive to particular wavelengths. When photons of light, between 400 to 780nm in wavelength, enter the eye, they collide with the pigment molecules inside these ...
Importance of eye care in the elderly
... cloudiness of the crystalline lens that starts interfering with the sharpness of vision, particularly during the evenings. Night driving may become hazardous because of the glare caused by the scattering of light by cataractous opacities. Some people who have these lens opacities in the dead centre ...
... cloudiness of the crystalline lens that starts interfering with the sharpness of vision, particularly during the evenings. Night driving may become hazardous because of the glare caused by the scattering of light by cataractous opacities. Some people who have these lens opacities in the dead centre ...
Conjunctivitis
... • Lateral Rectus -- allows eye to move horizontally and laterally (sideways) • Medial Rectus -- allows eye to move horizontally and medially (middle) • Superior Rectus -- allows eye to elevate (up) • Inferior Rectus -- allows eye to depress (down) • Inferior Oblique -- allows eye to elevate and turn ...
... • Lateral Rectus -- allows eye to move horizontally and laterally (sideways) • Medial Rectus -- allows eye to move horizontally and medially (middle) • Superior Rectus -- allows eye to elevate (up) • Inferior Rectus -- allows eye to depress (down) • Inferior Oblique -- allows eye to elevate and turn ...
An Overview of Anatomy and Physiology of the Eye
... Tenon s capsule is composed entirely of compactly arranged collagen fibers and a few fibroblasts. Anteriorly, it fuses with the conjunctiva slightly posterior to the corneoscleral junction (limbus). Posteriorly, it is perforated by the optic nerve sheath and by the posterior ciliary vessels and nerv ...
... Tenon s capsule is composed entirely of compactly arranged collagen fibers and a few fibroblasts. Anteriorly, it fuses with the conjunctiva slightly posterior to the corneoscleral junction (limbus). Posteriorly, it is perforated by the optic nerve sheath and by the posterior ciliary vessels and nerv ...
Differential diagnosis of PVD and retinal detachment
... Because the RD is separated from the RPE by a fluid reservoir, underlying choroidal detail will be obscured (same as a retinoschisis). The detached retina will be mobile and to differentiate it from retinoschisis, the patient should be asked to move his eye and then re-fixate. The appearance of the ...
... Because the RD is separated from the RPE by a fluid reservoir, underlying choroidal detail will be obscured (same as a retinoschisis). The detached retina will be mobile and to differentiate it from retinoschisis, the patient should be asked to move his eye and then re-fixate. The appearance of the ...
Iris - Stephen Tavoni
... The ciliary muscle and ciliary zonule are arranged sphincterlike around the lens. As a result, contraction loosens the ciliary zonule fibers and relaxation tightens them. ...
... The ciliary muscle and ciliary zonule are arranged sphincterlike around the lens. As a result, contraction loosens the ciliary zonule fibers and relaxation tightens them. ...
FREE Sample Here
... different in several ways: their shape, the location of each type on the retina, and overall number of each in the human eye. As rods and cones have distinct functions, they also can be associated with different disorders in vision: macular degeneration is a condition that destroys foveal cones; and ...
... different in several ways: their shape, the location of each type on the retina, and overall number of each in the human eye. As rods and cones have distinct functions, they also can be associated with different disorders in vision: macular degeneration is a condition that destroys foveal cones; and ...
Tsui, E
... loss is usually indicated. There are no established guidelines for treatment but most common procedure is pars plana vitrectomy (PPV). The literature supports induction of complete PVD during a PPV to relieve traction on the optic disc pit. Gas tamponade is also important to block passage of fluid t ...
... loss is usually indicated. There are no established guidelines for treatment but most common procedure is pars plana vitrectomy (PPV). The literature supports induction of complete PVD during a PPV to relieve traction on the optic disc pit. Gas tamponade is also important to block passage of fluid t ...
Retina
![](https://commons.wikimedia.org/wiki/Special:FilePath/Human_eye_cross-sectional_view_grayscale.png?width=300)
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.