6 yr old with BWS diagnosed at 3 weeks of age

[Liam2010]

Hi everyone, my son, Liam is 6 and s BWS which was diagnosed at 3 weeks of age. He is considered to have a "mild" case and has been monitored in increments since diagnosis. We had his eyes checked at the age of 4 and turns out, he could barely see. His prescription was changed in July 2016 and byDecember 2016 he already has a change over 2 points in his prescription. Is this a common problem associated with BWS or a normal change based on age?