I have tried the CRT lenses, and I would never recommend them to anyone. In total, I used them for about 6 months, and spent $1000. For the first 2-3 months, they were great. I wore them at night, and had 20/20 vision during the day with no contacts/glasses. Then the problems began. The lenses stopped fitting my eyes correctly, and the optometrist never seemed to be able to correct the fit (even though he insisted he could). The lenses became extremely painful to wear, and would actually be sticking to my eyes in the morning. You have to use a special suction device to remove them, which is very uncomfortable and painful. My eyes became extremely dry and irritated. The optometrist then had me wearing them during the day when these problems started, which defeats the purpose. They were still very uncomfortable, and I became worried about eye damage, so I just stopped them entirely.
When you think about how they work, it's quite disturbing. The lenses are reshaping your cornea, like a splint for your eye. I don't think there are any long term studies on the effects of this "corneal manipulation" and certainly would never expose a child to this risk.
I was seen by an optometrist (not an ophthalmologist), which may have been the problem. No ophthalmologist I have seen since has recommended CRT, all agreeing that they don't really work. Luckily, it was confirmed that I had no eye damage from the short trial that I used CRT. Now I wear soft contact dailies. I would recommend waiting and getting lasik (that's my plan now). It improves every year, and will only get better by the time your child is a young adult. It's a short sacrifice with using contacts/glasses to preserve eye health. I hope my experience can save others money.