How risky is enophthalmos surgery to the optic nerve? How many people experience complications?

It is best to get examined in person by an oculoplastic specialist. It is doubtful skin laser can cause enophthalmos. The cause needs to be found, then treatment can be considered. The treatment may be implant placement in the eye socket (orbit) which is very safe if done correctly.

Surgery to help enophthalmos is typically performed after orbital trauma but it is quite rare.  Therefore, you should be extremely skeptical of anyone who claims they do this all the time.  Volume can be placed in the orbit with a floor implant, fillers, or fat grafting.  While generally safe when performed by a very experienced surgeon, the risk is not zero and the procedure has as a risk the potential for optic nerve injury and permanent visual loss.  For blepharoplasty (cosmetic eyelid surgery, the risk of blindness is probably in the 1 in 30,000 surgery range.)  For this procedure, I would put the risk as greater than 1 in 1000.  Yes, that is significant higher risk than blepharoplasty.  For this reason, great care should go into this decision.