• deficits
  • The supposed artifactual nature of Wilbrand's knee has implications for the degree of resection that can be obtained, namely by cutting the optic nerve immediately at the junction with the chiasm without fear of potentially resulting visual field deficits. (wikipedia.org)
  • optic chiasm
  • Chiasmal syndrome is the set of signs and symptoms that are associated with lesions of the optic chiasm, manifesting as various impairments of the sufferer's visual field according to the location of the lesion along the optic nerve. (wikipedia.org)
  • pituitary
  • The diagnosis of hypopituitarism is made by blood tests, but often specific scans and other investigations are needed to find the underlying cause, such as tumors of the pituitary, and the ideal treatment. (wikipedia.org)
  • subject's
  • Visual field testing can be performed clinically by keeping the subject's gaze fixed while presenting objects at various places within their visual field. (wikipedia.org)
  • 6 . A method in accordance with claim 4 , wherein the tuning includes increasing the spatial frequency of the grating until the illusion is not properly detected by the subject and then maintaining the spatial frequency at a level that is detectable by the subject, yet near the limit of the spatial resolution of the subject's central visual field. (google.com.au)
  • demonstrates
  • Conclusions: The Caspar's Castle system of assessing visual fields using novel game-based strategies demonstrates encouraging levels of sensitivity, specificity, and reliability. (manchester.ac.uk)
  • Vision
  • Vision is tested by presenting different sized pins attached to a black wand, which may be moved, against a black background. (wikipedia.org)
  • Your central vision is relatively easily tested (for example, with a standard Snellen (eye) chart. (northerneyesurgeons.com.au)
  • Abrupt painless loss of vision in the visual field corresponding to territory of the obstructed artery is the typical history of presentation. (wikipedia.org)
  • Streff syndrome is a vision condition primarily exhibited by children under periods of visual or emotional stress. (wikipedia.org)
  • Abnormal results on color vision or visual field testing is not uncommon. (wikipedia.org)
  • Visual decline progresses relatively quickly to the far peripheral field, eventually extending into the central visual field as tunnel vision increases. (wikipedia.org)
  • Color vision testing using color test plates (HRR series) reveals many errors on both red-green and blue-yellow plates. (wikipedia.org)
  • Fluorescent angiography, ERG, and color vision tests are important tools to help facilitate diagnosis in early stages. (wikipedia.org)
  • Apoplexy, in addition to sudden headaches and rapidly worsening visual loss, may also be associated with double vision that results from compression of the nerves in the adjacent cavernous sinus that control the eye muscles. (wikipedia.org)
  • Binasal hemianopsia (or binasal hemianopia) is the medical description of a type of partial blindness where vision is missing in the inner half of both the right and left visual field. (wikipedia.org)
  • The absence of vision in half of a visual field is described as hemianopsia. (wikipedia.org)
  • Abnormal
  • Abnormal cone function on the ERG is indicated by a reduced single-flash and flicker response when the test is carried out in a well-lit room (photopic ERG). (wikipedia.org)
  • varies
  • The visual prognosis for ocular ischemic syndrome varies from usually poor to fair, depending on speed and effectiveness of the intervention. (wikipedia.org)
  • diagnosis
  • Risk factors include: Hypertension Elevated lipid levels cigarette smoking Diabetes Ancillary testing is not usually necessary to make the diagnosis. (wikipedia.org)
  • Because of the wide spectrum of fundus changes and the difficulty in making the diagnosis in the early stages, electroretinography (ERG) remains the best test for making the diagnosis. (wikipedia.org)
  • secondary
  • Toxic and nutritional optic neuropathy is a group of medical disorders defined by visual impairment due to optic nerve damage secondary to a toxic substance and/or nutritional deficiency. (wikipedia.org)
  • The condition presents with visual loss secondary to hypoperfusion of the eye structures. (wikipedia.org)
  • cone
  • The relative sparing of rod function in cone dystrophy is evidenced by a normal scotopic ERG, i.e. when the test is carried out in the dark. (wikipedia.org)
  • often
  • Visual field often presents as constricted 'tubular' at multiple test distances. (wikipedia.org)
  • Phenomena such as photophobia, which describes the event in which light is perceived as an intense glare, and photopsia, the presence of blinking or shimmering lights within the visual field, often manifest during the later stages of RP. (wikipedia.org)
  • structural
  • Early Adaptive Syndrome Most optometrists agree that Streff syndrome is a generalized reduction in visual performance that is not caused by structural damage. (wikipedia.org)