Final answer:
The boy's symptoms indicate that he has conjunctivitis, characterized by the redness and swelling in the conjunctiva and the discharge that can crust on the eyelashes.
Step-by-step explanation:
Based on the symptoms described in the question, the correct diagnosis is 1) Conjunctivitis. Conjunctivitis, also known as pinkeye, is characterized by inflammation of the conjunctiva, leading to redness and swelling in the conjunctiva, the membrane lining the whites of the eyes and the inner eyelids. The condition is commonly associated with a discharge that may dry and crust on the eyelashes, exactly as described in the case of the boy with bilateral red eyes and eyelids that were stuck together in the morning. His 6/6 vision indicates that the condition has not affected his eyesight, which is consistent with conjunctivitis.
In contrast, blepharitis is inflammation of the eyelids, chalazion is a blocked oil gland in the eyelid, and keratitis is an inflammation of the cornea, none of which match the symptoms presented by the boy.