What is Heteronymous hemianopia?
a visual field defect in which vision in either the left or right half of both eyes is absent due to a lesion in the optic chiasm.
What are the types of hemianopia?
What Are the Types of Hemianopia?
- Right hemianopia, which causes a loss of vision in the right half of each eye.
- Left hemianopia, which causes a loss of vision in the left half of each eye.
- Superior hemianopia, which causes a loss of vision in the upper half of each eye.
What is congruent hemianopia?
[ kŏng′grōō-əs ] n. Hemianopsia in which the defects in the visual field of each eye are symmetrical in every respect.
What is contralateral hemianopia?
[1] HH can also be characterized as contralateral hemianopsia (unilateral involvement at the optic tract, lateral geniculate nucleus, optic radiations, or occipital cortex opposite to the side of field loss) in contrast to bitemporal hemianopsia (involvement at the optic chiasm).
What is a Bitemporal hemianopia?
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 congruous and incongruous?
A congruous visual field defect is identical between the two eyes, whereas an incongruous defect differs in appearance between the eyes.
What is incongruous 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 is bilateral bitemporal hemianopia?
Bitemporal hemianopia (bi-: both eyes, temporal: temporal/peripheral, hemi-: half, anopsia: blindness) is defect in visual pathway causing loss of sight in the outer half of the visual field. A lesion compressing or disrupting optic chiasm would result in bitemporal hemianopia.
Why bitemporal hemianopia occur due to pituitary tumor?
Bitemporal hemianopsia is classically associated with suprasellar extension of the pituitary tumor, causing compression of the anterior aspect of the optic chiasm. Other visual field deficits can also occur. Changes in ophthalmologic assessment can be used to monitor the response to therapy.
What is the bitemporal hemianopia?