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Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
It does take time to recover from this surgery. My feeling is that the double vision is coming from inflammation and should resolve. Was his macula still attached when the RD was discovered? If so, recovery is usually quite good.
I'm an optometrist in the states btw.
My brother is far less short-sighted than me and he had one and I didn't; it's only a tendency. He told me they fixed his other retina in while they were about it but I don't know how reliable that information is.
You can't prevent it though - just be aware of the signs and get it seen to ASAP if it happens - watch out for a sudden increase in floaters.