my son had the op, on both eyes! he didnt wear a patch or anything like that, he will have to have drops in his eyes and have at least a week ofF school, ..did they not tell you this?....anyway he wont be able to play out either because they wont want him to get an infection by playing outside, getting his hands grubby and then rubbing his eyes
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he will probably be grumpy and tired apart from that he should be fine.....my son didnt even have any black eyes or swelling!, there was nowt there whatsoever, the only scary part was him seeing a bit of blood on his pillow, which was watery ...understandable due to the operation i suppose, also one more thing he will probably get a bit of matter in his eyes which you will have to clean, like ya would have done if they got conjuctivitis
another thing,....try not to worry