Search results
Results from the WOW.Com Content Network
Scintillating scotoma is a common visual aura that was first described by 19th-century physician Hubert Airy (1838–1903). Originating from the brain, it may precede a migraine headache, but can also occur acephalgically (without headache), also known as visual migraine or migraine aura.
Peripheral prism spectacles expand the visual field of patients with hemifield visual defects and have the potential to improve visual function and mobility. Prism spectacles incorporate higher power prisms, with variable shapes and designs.
Hemianopsia, or hemianopia, is a loss of vision or blindness ( anopsia) in half the visual field, usually on one side of the vertical midline. The most common causes of this damage are stroke, brain tumor, and trauma. [1]
Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field.
He lost his visual field beyond a 30-degree eccentricity and could not identify visual objects by their proper names. "LM" Most of what is known about akinetopsia was learned from LM, a 43-year-old female admitted into the hospital October 1978 complaining of headache and vertigo.
Optic nerve lesions. The optic nerve, also known as cranial nerve II, extends from the optic disc to the optic chiasma. Lesions in optic nerve causes visual field defects and blindness.
When there is compression at the optic chiasm, the visual impulse from both nasal retina are affected, leading to inability to see the temporal, or peripheral, field of vision. This phenomenon is known as bitemporal hemianopsia.
Idiopathic palinopsia may be analogous to the cerebral state in persistent visual aura with non-migraine headache or persistent visual aura without headache. Due to the subjective nature of the symptoms and the lack of organic findings, clinicians may be dismissive of illusory palinopsia, sometimes causing the patient distress.
Photopsia is the presence of perceived flashes of light in the field of vision. It is most commonly associated with: posterior vitreous detachment; migraine aura (ocular migraine / retinal migraine) migraine aura without headache; scintillating scotoma; retinal break or detachment; occipital lobe infarction (similar to occipital stroke)
A particular blind spot known as the physiological blind spot, "blind point", or punctum caecum in medical literature, is the place in the visual field that corresponds to the lack of light-detecting photoreceptor cells on the optic disc of the retina where the optic nerve passes through the optic disc. [2]