a full-thickness defect of the eyelid.the most common position is at the junction of the medial and middle third of the upper lid.
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Bilateral symmetrical partial absence of medial part of upper eyelids.
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Corneal protection is the primary goal in the medical treatment of eyelid colobomas
Artificial tears and ointment (Tears Natural-Liquifilm Tears)
Moist chamber optical bandages
Bedtime patching

Corneal protection and cosmesis are indications for surgical therapy.
If the eyelid coloboma is small: and well managed with topical lubrication, then surgery may be delayed until later in childhood. Usually, it is corrected by direct closure.
If the eyelid coloboma is large: immediate surgical closure is usually needed