Grading of foveal avascular zone using fluorescein angiography. *As defined in the ETDRS group report 11.
|Grade||Outline of FAZ||Size of FAZ||Capillary loss|
|Grade 0||Outline of FAZ normal||Size of FAZ less than the area of the 300 µm radius circle*||Capillary loss absent|
|Grade 1||Outline of FAZ not smoothly round or oval-shaped. Appreciable irregularities seen but not necessarily abnormal||Size of FAZ equal to area of the 300 µm radius circle*||Capillary loss questionable|
|Grade 2||Outline of FAZ obviously damaged but limited to less than half of the circumference||Size of FAZ greater than the 300 µm radius circle* but less than the 500 µm radius circle*||Capillary loss definitely present|
|Grade 3||Outline of FAZ destroyed for at least half the circumference, with some remnants still present||Size of FAZ greater than or equal to the 500 µm radius circle*||Moderate capillary loss|
|Grade 4||Capillary outline totally destroyed|| ||Severe capillary loss|
|Grade 8||Cannot be graded||Cannot be graded|| |