Yes soon we will have more information on this via Aniridia Network UK - it is a fabulous signing technique easily learned (more so than Makaton I find personally) and specifically takes into account low vision, blindness or variable vision (like Aniridia).
Ella has responded very well to the signing as it allows for a child's own signs to be used as a starting point - you can flex the signing you are teaching them to enhance their understanding and vocabulary around those signs they probably already do.
Mary Lee from the Royal Blind School in Edinburgh is hoping to offer us some more advice and answer questions at ANUK.