Hi there. I Am an optometrist, erins world I have only seen them via catalogue, they sound amazing, the only observation i had was that the range is verrrry plain , not very cute for little girls or boys, they are supplied by a company called merchamp, honestly most opticians would have no problem in getting them in for you on an appro basis, if you dont like them the shop can send them back, no bother, I try and use the cutest most durable, frames for younger kids. The beauty of erins world is that they are designed for a "flat" nose ( now this is not my phrasing but the erins world rep'). I have said if I do have a young patient with ds I'll definately give them a go. As for personal experience of the range, I don't have any as yet,
Feel free to ask any questions, as for any optician stocking the range, you could ring merchamp optical and ask them where they would recommend to go, they are very helpful.