Table 1.

Electroretinogram Findings in Complete and Incomplete X-Linked Congenital Stationary Night Blindness

ERG FindingComplete (NYX X-linked CSNB)Incomplete (CACNA1F X-linked CSNB)
Scotopic rod b-waveSeverely reduced or absentReduced
Mixed scotopic a-waveNormalSlightly reduced
Mixed scotopic b-waveReducedReduced
Scotopic OPAbsentSlightly reduced
Photopic a-waveNormal, slightly reduced, sawtooth (square) shapedReduced
Photopic b-waveSlightly reducedReduced
Photopic OPLost, except for OP4All OPs are lost.
30-Hz flickerNormal / slightly reducedReduced w/double peak

OP = oscillatory potential

From: X-Linked Congenital Stationary Night Blindness

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