Diplopia (double vision)
(a) Binocular
 Ocular muscle paralysis
 Orbital diseases (thyroid orbitopathy, orbital pseudotumor, orbital tumor, cavernous sinus/superior orbital fissure syndrome, blow-out fracture; enophthalmos, diplopia, anesthesia in infraorbital nerve dermatome and subconjunctival bleeding)
 Myasthenia gravis (intermittent)
(b) Monocular
 Uncorrected high astigmatism
 Corneal opacity or irregularity
 Cataract and pupillary abnormalities (wide peripheral iridotomy)
Acute proptosis
orbital pseudotumor
Thyroid orbitopathy
Traumatic orbital hemorrhage
Orbital cellulite
Carotico-cavernous sinus fistula (bilateral)
Cavernous sinus thrombosis (bilateral)
leukemia or lymphoma
Rhabdomyosarcoma or metastatic neuroblastoma (in children)
