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Scheme showing central connections of the optic nerves and optic tracts. (Lesions at different locations relate to different types of anopsias.)
ICD-10 H53.4
ICD-9 368.4

An anopsia (or anopia) is a defect in the visual field. If the defect is only partial, then the portion of the field with the defect can be used to isolate a lesion.

Types of partial anopsia: