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0.5-mm test object 1-meter 2-mm test object 5-mm white absolute scotoma accurate Bitemporal hemianopia Bjerrum scotoma blind area brain central scotoma chorioretinitis color congruous homonymous hemianopia constricted field cross sequence diameter disease distance edge exactly field defect field is seen fixation point glaucoma hemianopia with macular instruct the patient isopter line large test object left eye left half left optic left side loss of sight macular sparing macular splitting meter millimeters move the test normal blind spot object is moved ophthalmologist optic chiasm optic nerve optic tract patient's eye perimetric examination perimetric recording perimetrist pinhead position Question recording form relative scotoma retina right eye right half right side right visual field Roenne's nasal step Seidel scotoma small scotoma small test object tangent screen Tell temporal side test object disappears test object visible type of field vertical visual angle visual field extend visual pathways white test object