This could be 'conjunctivitis' if you see your vet he/she may be able to give medication to settle this, in the mean time wash the eyes gently with a warm washer.

My cat had swollen eye once, this was because there was a grass seed lodged in his eye, if they are swollen i suggest you check for grass seeds and see the vet.

Good luck and i hopw your kitten s eyes settle down ok!