| Neurogenic |
| Oculomotor / cranial nerve 3 dysfunction |
| Horner's syndrome / oculosympathetic paresis |
| Myasthenia gravis / ocular myasthenia subtype |
| Guillain-Barré syndrome / Fisher's variant |
| Multiple sclerosis |
| Cluster headache |
| Ophthalmoplegic migraine |
| Marcus Gunn jaw-winking syndrome |
| Botulism |
| Myogenic |
| Congenital ptosis |
| Congenital fibrosis of the extraocular muscles |
| Chronic progressive external ophthalmoplegia / Kerns-Sayre syndrome subtype |
| Muscular dystrophy |
| Oculopharyngeal muscular dystrophy |
| Mechanical |
| Eyelid tumors |
| Cicatricial processes (ocular cicatricial pemphigoid, Stevens-Johnson syndrome) |
| Dermatochalasis |
| Brow ptosis |
| Floppy eyelid syndrome |
| Pseudoptosis |
| Enophthalmos (orbital fracture, scirrhous tumor) |
| Contralateral lid retraction (thyroid eye disease) |
| Contralateral proptosis |
| Hypotropia |
| Irritative (secondary to conditions affecting the ocular surface) |
| Giant papillary conjunctivitis second to contact lens wear |
| Squinting or guarding from ocular surface disease (corneal erosion, abrasion, infiltrate, ulcer) |
| Iatrogenic |
| Botulinum toxin injection |
| Following cataract surgery or trabeculectomy |
| Traumatic (can be neurogenic, myogenic, or aponeurotic) |
