This comment is coming too late to help you, but I want to make it so that anyone else who comes across this message board knows what to do for their child. I hope you got the right advice and did the right thing.
You should not, under any circumstances, expect this disorder to sort itself out. I have this condition (I was diagnosed at birth), but I hardly suffer at all from it because my parents immediately took corrective action (the only drawbacks are the lack of depth perception and limited field of vision, and there's nothing anyone can do about those things).
At six months, I had my first glass eye, and it was enlarged every six months for years in order to simulate the growth of a natural eye. This is important, because without the simulated growth, the child's skull will not develop normally, which can lead not only to severe deformity but also to reduced brain development.
If you don't do anything about this defect, your child stands a much lesser chance of leading a normal life. My parents received this advice, took it, and I have led not only a normal but even an exceptionally fulfilling life as a result. I was a National Merit Scholar, I attend one of the top ten law schools in the country, and I am a husband and father. I'm not sure if those accomplishments would have been possible had I not received the treatment I did. In fact, my pediatrician asked me to visit with parents whose children were diagnosed with this condition so I could a) convince them to get their child the necessary treatment, and b) reassure them that their child could lead a wonderful life despite the condition.
If you're reading this because your child was diagnosed with microphthalmus, get your child to an ophthalmologist. It's expensive, but for your child's sake, don't let that stop you.
Usually doesn't, most important thing is preserving the other eye. He should be under the care of a good pediatric ophthalmologist.
JCH MD