Nontraumatic
Acute angle-closure glaucoma^
Anterior uveitis
Conjunctivitis
Corneal erosion
Corneal ulcer^
Endophthalmitis^
Episcleritis
Herpes zoster ophthalmicus
Inflamed pinguecula
Inflamed pterygium
Keratoconjunctivitis
Keratoconus
Nontraumatic<unk> 
Scleritis^
Subconjunctival hemorrhage
Orbital trauma
Caustic keratoconjunctivitis^^
Corneal abrasion, Corneal laceration
Conjunctival hemorrhage
Conjunctival laceration
Globe rupture^
Lens dislocation
Ocular foreign body
Posterior vitreous detachment
Retinal detachment
Retrobulbar hemorrhage
Ocular compartment syndrome
Traumatic hyphema<unk> 
Traumatic mydriasis
Traumatic optic neuropathy
Vitreous detachment
Vitreous hemorrhage
Ultraviolet keratitis
Acute angle-closure glaucoma^
Anterior uveitis
Conjunctivitis
Corneal erosion
Corneal ulcer^
Endophthalmitis^
Episcleritis
Herpes zoster ophthalmicus
Inflamed pinguecula
Inflamed pterygium
Keratoconjunctivitis
Keratoconus
Nontraumatic<unk> 
Scleritis^
Subconjunctival hemorrhage
Caustic keratoconjunctivitis^^
Corneal abrasion, Corneal laceration
Conjunctival hemorrhage
Conjunctival laceration
Globe rupture^
Lens dislocation
Ocular foreign body
Posterior vitreous detachment
Retinal detachment
Retrobulbar hemorrhage
Ocular compartment syndrome
Traumatic hyphema<unk> 
Traumatic mydriasis
Traumatic optic neuropathy
Vitreous detachment
Vitreous hemorrhage
Ultraviolet keratitis
Ocular compartment syndrome
^Emergent diagnoses
^^Critical diagnoses
Painful
Arteritic anterior ischemic optic neuropathy
Optic neuritis
Temporal arteritis†
Painless
Amaurosis fugax
Central retinal artery occlusion (CRAO)†
Central retinal vein occlusion (CRVO)†
High altitude retinopathy
Open-angle glaucoma
Posterior reversible encephalopathy syndrome (PRES)
Retinal detachment†
Stroke†
Vitreous hemorrhage
Traumatic optic neuropathy (although may have pain from the trauma)
Arteritic anterior ischemic optic neuropathy
Optic neuritis
Temporal arteritis†
Amaurosis fugax
Central retinal artery occlusion (CRAO)†
Central retinal vein occlusion (CRVO)†
High altitude retinopathy
Open-angle glaucoma
Posterior reversible encephalopathy syndrome (PRES)
Retinal detachment†
Stroke†
Vitreous hemorrhage
Traumatic optic neuropathy (although may have pain from the trauma)
†Emergent Diagnosis
Traumatic iritis
Nontraumatic
Malignant otitis externa
Acute angle-closure glaucoma^
Dacryocystitis
Anterior uveitis
Mastoiditis
Conjunctivitis