way too early to think about it.
dd2 made biggest developmental strides around 3/4/5 yo. it was a pretty bleak picture earlier. by yr 1 she was independently mobile/ verbal etc.
agree it does sound interesting - there was a dad on the scope forum i think who took his son over for sdr at around 7/8? a while ago now. ds would be probably 9/10 by now, so it might be worth looking him up and seeing how everything is a few years on. i don't know anyone personally who has gone the sdr route.
imo 7 would be the earliest i would consider - i really think that until that point you don't really know where you are going to end up? had an interesting discussion with slt this week though. (she hasn't seen slt for ages - although she is still a little dysarthric it's not usually a problem, but at parent's evening her teacher made a big thing of saying she wasn't intelligible when reading aloud etc etc. as she's moving to a new school in the summer and no-one will be familiar with her speech i thought we ought to speak to slt and get their opinion)
anyways (long ramble to the point)
slt thinks that at 7/8 we are as far forward as it is likely to get with clarity. as the dysarthria is caused by neuro damage etc, up to that point there is potential for new pathways etc etc, but that at 7/8 (and with her speech actually very good) it's unlikely that it will improve much more, so it's more about coping strategies if she needs them. and, more to the point, about school and responsible adults taking the responsibility of understanding, rather than about her.
this was sort of echoed by the eye team (she's had an alternating converging squint since about 3 mos which was operated on last summer, finally). the earlier you operate, the better chance the brain has to acquire binocular vision - by about 7/8 you are really operating for cosmetic reasons only.
sooooooooo, i dunno. i personally wouldn't consider it until 7 at the earliest, but haven't really looked into whether results are different with age... i suppose you could use the same argument with sdr? it's definitely made a huge difference in some children - massive. i can see why it's tempting!