What causes arcuate scotoma?

An arc-shaped scotoma near the blind spot of the eye. It is caused by a nerve bundle defect on the temporal side of the optic disk.

What are the pathophysiology of vision defects?

Pathophysiology of Acute Vision Loss Opacification of normally transparent structures through which light rays pass to reach the retina (eg, cornea, vitreous) Retinal abnormalities. Abnormalities affecting the optic nerve or visual pathways.

What is an arcuate visual field defect?

A small, bow-shaped (arcuate) visual field defect that follows the arcuate pattern of the retinal nerve fibers; does not cross the horizontal median. Damage to ganglion cells that feed into a particular part of the optic nerve head. More common: Glaucoma.

What does arcuate scotoma mean?

Definition. A localized defect in the visual field bordered by an area of normal vision. This occurs with a variety of EYE DISEASES (e.g., RETINAL DISEASES and GLAUCOMA), OPTIC NERVE DISEASES, and other conditions. [

What causes Binasal hemianopia?

The pathophysiology of binasal hemianopsia, while not well understood, is hypothesized to be associated with damage caused by increased intracranial pressure and/or compression from adjacent arteries such as the internal carotid or anterior cerebral caused by shifting from nearby intracranial tumors.

What is TVO in Ophthalmology?

Transient visual obscurations (TVO) – Episodes lasting seconds that are associated with papilledema and increased intracranial pressure. Amaurosis fugax – Brief, fleeting attack of monocular partial or total blindness that lasts seconds to minutes.

What is annular scotoma?

annular scotoma a circular area of depressed vision surrounding the point of fixation. arcuate scotoma an arc-shaped defect of vision arising in an area near the blind spot and extending toward it.

What is Binasal hemianopia?

Binasal hemianopsia 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. It is associated with certain lesions of the eye and of the central nervous system, such as congenital hydrocephalus.

What causes Bitemporal Hemianopsia?

A bitemporal hemianopia is almost always caused by damage to the optic chiasm and can occur from the direct or indirect effects of a variety of lesions, including tumors,1 aneurysms,2 and, less frequently, inflammatory and ischemic diseases.

What is an example of scotoma?

A paracentral scotoma is a blind spot slightly off-center in your vision. For example, if you have a paracentral scotoma, you can probably see the words on road signs clearly, but there are spots near the sign that are dark or blurry.

What is positive and negative scotoma?

peripheral scotoma an area of depressed vision toward the periphery of the visual field. physiologic scotoma that area of the visual field corresponding with the optic disk, in which the photosensitive receptors are absent. positive scotoma one which appears as a dark spot in the visual field.