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Br J Ophthalmol 89:70-73 doi:10.1136/bjo.2004.042416
  • Clinical science
    • Extended reports

Acute zonal occult outer retinopathy: towards a set of diagnostic criteria

Table 1

 Electrophysiological abnormalities in patients with AZOOR

Electrophysiological measure Normal range (min–5%; max+5% Median Range 25th centile 75th centile
ERG, electroretinogram; PERG, pattern ERG; EOG, electro-oculography.
Pattern ERG (μV) >2.0 1.2 0.0–3.2 0.0 2.2
EOG light rise (Arden index) 130 100–300 100 200
Interocular EOG light rise difference (10 unilateral cases only) 80 40–200 45 125
Scotopic rod ERG amplitude (μV) 152–452 105 0–275 45 150
Scotopic rod ERG latency (ms) 78–108 89 48–133 85 105
Maximal ERG a-wave amplitude (μV) 261–495 165 0–405 86 255
Maximal ERG a-wave latency (ms) 9–15 12 10–13 11 13
Maximal ERG b-wave amplitude (μV) 366–866 270 0–555 120 400
30 Hz flicker amplitude (μV) 68–226 40 0–155 15 65
30 Hz flicker latency (ms) 23–28 30 24–46 27 36
Photopic ERG b-wave implicit time 26–34 32 26–42 30 36
Photopic ERG b-wave amplitude 101–336 70 0–190 25 103
ON-b-wave amplitude (μV) 31 0–52 16 43
ON-b-wave latency (ms) 35 33–46 34 36
OFF-d-wave amplitude (μV) 49 0–93 10 67
OFF-d-wave latency (ms) 223 221–230 223 225

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