chiasmal


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chiasmal

See chiasm.
References in periodicals archive ?
Post chiasmal visual pathway: Post chiasmal interference in visual pathway produces homonymous hemianopia in visual field from a single lesion.
b) The defect suggests a lesion that is chiasmal in origin
Most commonly a nasal defect of the optic disc may be seen, with hypopigmentation of the inferonasal retina, and these individuals may have a supero-temporal visual field defect2 that does not observe the vertical midline, which distinguishes it from a visual field defect that is due to chiasmal compression.
Gross defects such as hemianopias, which can be caused by chiasmal tumours, can be detected this way.
Uni- and bi-temporal visual fields defects, including those obeying the midline, need to be considered as indicative of chiasmal lesions.
One should always check the VF from the 'uninvolved' eye for subtle defects even when symptoms are unilateral (such as in the case of a temporal defect in junctional scotoma that could arise from a chiasmal compressive lesion).