Figure 1: Electroretinographic findings in twin sisters (patient 1 and patient 2) with PMM2-CDG at the age of 4 years (A),
18 years (B) and 41 years (C).
A: 1980: Adapto ERG revealed decreased amplitudes, more obvious for patient 2.
B: 1995: On adapto ERG, repsonses were entirely extinguished bilaterally. This exam was now completed with an ERG using the ISCEV standard; no recordable dark adapted or light adapted response was observed.
C: 2018: ERG revealed unchanged findings.