Children generally recover quickly and well from BP. For some recovery may take only a week or two and they may suffer none of the pain, tiredness and emotional distress that adults do. Others may not feel so well and its important for the parent to assess the situation and decide if their child is up to attending school or whether he really needs to take some time away to rest and heal.
If your child does go to school, inform the teacher that he may tire easily and that his eye must be protected at all times while at school. A patch and eye drops should suffice for ordinary gentle sport / PE/ playtimes and will prevent dirt and debris getting into the eye. Football and contact sports should be avoided because the patch will prevent the child from having a full visual spectrum and he could get hurt.
For swimming the eye should be protected with Lacrilube and the best swimming goggles you can find. An excellent seal is important. Speedo or Zoggs should be fine, but buy the best.