What is incongruous homonymous hemianopia?
What is incongruous homonymous hemianopia?
Summary. Optic disorder in which the visual field defects in both eyes are completely symmetric in extent and intensity are defined as Congruous homonymous hemianopia.
What causes incongruous homonymous hemianopia?
Injury to the right side of the brain will affect the left visual fields of each eye. The more posterior the cerebral lesion, the more symmetric (congruous) the homonymous hemianopsia will be. For example, a person who has a lesion of the right optic tract will no longer see objects on his left side.
What does congruous hemianopia mean?
[ kŏng′grōō-əs ] n. Hemianopsia in which the defects in the visual field of each eye are symmetrical in every respect.
What is Meyer’s loop?
The Meyer loop (also sometimes known as Archambault loop) is part of the inferior optic radiation that sweeps back on itself into the temporal lobe, just lateral to the temporal horn of the lateral ventricle.
What is congruous field defect?
A congruous visual field defect is identical between the two eyes, whereas an incongruous defect differs in appearance between the eyes. For lesions behind the LGN, visual field defects are generally more congruous if the lesion is located more posteriorly along the visual pathway.
What causes bitemporal hemianopia?
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 a Binasal visual field defect?
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 is Bitemporal Hemianopsia?
Introduction. Bitemporal hemianopsia (or bitemporal hemianopia) describes the ocular defect that leads to impaired peripheral vision in the outer temporal halves of the visual field of each eye.
What is pie in floor?
‘pie on the floor’ defect. quadrantanopia, superior. A superior homonymous loss of vision in two quarters due to a lesion of the most anterior and inferior fibres of the optic radiations in the temporal lobe involving Meyer’s loop, on the contralateral side of the visual pathway (Fig.