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TableĀ 5 Grades of peripheral capillary non-perfusion (CNP)

From: Grading fluorescein angiograms in malarial retinopathy

Lesion Grading Definition Figures
Peripheral CNP Cannot grade No gradeable images of any retinal quadrant exist None
Absent One or more gradeable images of one or more peripheral quadrants exist, and no CNP is seen on any of these images None
Mild grade 1 Ranges from any CNP in the periphery to multiple areas of CNP that are individually not larger than 1/3 disc area 13, 14
Grade 2 Multiple areas of CNP that are, individually, between 1/3 and 1 disc area 15, 16
Grade 3 Includes features of previous grades, plus one or more large bays of peripheral CNP, each >1 disc area 17
Grade 4 One or more bays of CNP invade the superior, inferior, or temporal borders of zone 1, or zone 2 of the nasal retina 18