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No light perception is considered total visual impairment, or total blindness; see Visual impairment#Classification: NPC: Near point of convergence or no previous correction NRC Normal retinal correspondence NV Near vision NWT Normal wearing time o symptoms Zero symptoms ϕ Horizontal orthophoria θ Vertical orthophoria ⊕
It is light-sensitive and communicates visual messages to the brain. If the retina detaches, it moves and shifts from its normal position. This can cause photopsia, but can also cause permanent vision loss. Medical attention is needed to prevent vision loss. Procedures may include laser treatment, freezing, or surgery.
Papilledema: "The underlying mechanism for visual obscurations in all of these patients appear to be transient ischemia of the optic nerve head consequent to increased tissue pressure. Axonal swelling, intraneural masses, and increased influx of interstitial fluid may all contribute to increases in tissue pressure in the optic nerve head.
During this detachment, the shrinking vitreous can stimulate the retina mechanically, [9] causing the patient to see random flashes across the visual field, sometimes referred to as "flashers", a symptom more formally referred to as photopsia. The ultimate release of the vitreous around the optic nerve head sometimes makes a large floater ...
comet shaped visual field defect, extending temporally from the physiological blind spot Blumberg's sign: Jacob Moritz Blumberg: surgery: peritonitis: rebound tenderness Boas' point: Ismar Isidor Boas: gastroenterology: gastric ulcer: dermal hyperaesthesia just left of T12 Boas' sign: Ismar Isidor Boas: gastroenterology: acute cholecystitis
The most common symptoms of acquired and transient cortical blindness include: A complete loss of visual sensation and of vision [4] Preservation/sparing of the abilities to perceive light and/or moving, but not static objects (Riddoch syndrome) [2] A lack of visual fixation and tracking [4] Denial of visual loss (Anton–Babinski syndrome)
The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
A blurred or gray spot in the central visual field is common when the retina is detached. Reduced visual acuity may persist after the fluid has disappeared. [1] The disease is considered of unknown cause. It mostly affects white males in the age group 20 to 50 (male:female ratio 6:1) [3] and occasionally other groups.