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halo (haŽlo) a circular structure, such as a luminous circle seen surrounding an object or light. Fick halo
a colored circle appearing around a light, experienced by wearers of contact lenses. halo glaucomatosus
, glaucomatous halo
a narrow light zone surrounding the optic disk in glaucoma. senile halo
a zone of variable width around the optic disk, due to exposure of various elements of the choroid as a result of senile atrophy
of the pigmented epithelium.
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