Final answer:
Congenital ptosis is a condition where the eyelid droops due to developmental failure of the levator palpebrae superioris muscle.
Step-by-step explanation:
Congenital ptosis is a condition where the eyelid droops due to developmental failure of the levator palpebrae superioris muscle. This can be present from birth and is often caused by a lack of muscle function or a problem with the nerve supply to the muscle. Examples of other conditions that can cause ptosis include cranial nerve III lesion, muscle disease such as myasthenia gravis, and fat deposits in the upper lid resulting in increased weight of the eyelid.