Hello and thanks for your question. One of the first things he should go is use artificial tears in that eye as well as cool compresses. These two things will make it feel better somewhat very soon. The string may have just bruised the eye, but it could also have caused a scratch on the eye, inflammation inside the eye (iritis), or at the very worst it could cause a laceration of the eye. If the pupil is still round and symmetrical in shape with the other and if the vision is not significantly affected then it is unlikely that the eye has sustained a laceration. If the vision is significantly worse in that eye, if there is nausea/vomiting or extreme light sensitivity
or pain then he should see his eye doctor, especially if things are worsening.
Does this information help address your concerns? Does this make sense? Do you have any other concerns that I haven't addressed?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.