FA Atlas Book

Hypofluorescence

Hypofluorescence

Retinal Vein Occlusion

is a lower level of fluorescence (seen as darker patches) caused by either the blockage of light from normally fluorescing structures or inadequate circulation in an area of the retina or choroid.

Filling defect – An area of poor fluorescence caused by a abnormal circulation. This can be non-perfusion or ischemia.

Filling defect from non-perfusion

Proliferative Diabetic Retinopathy

Blocking defect – An absence or marked decrease of fluorescence observed in an area that would normally show fluorescence. This can be caused by the presence of opaque material such as blood or pigment in a nevus.

Blocking defect from hemorrhage

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fa Diagnostic Atlas

A Retinal Reference Guide