Nontraumatic
Acute angle-closure glaucoma^
Anterior uveitis
Conjunctivitis
Corneal erosion
Corneal ulcer^
Endophthalmitis^
Episcleritis
Herpes zoster ophthalmicus
Inflamed pinguecula
Inflamed pterygium
Keratoconjunctivitis
Keratoconus
Nontraumatic iritis
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
Traumatic iritis
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 iritis
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
Traumatic iritis
Traumatic mydriasis
Traumatic optic neuropathy
Vitreous detachment
Vitreous hemorrhage
Ultraviolet keratitis
Ocular compartment syndrome
^Emergent diagnoses
^^Critical diagnoses
Unilateral red eye
Nontraumatic
Bilateral red eyes
Acute angle-closure glaucoma^
Periorbital swelling
Anterior uveitis
Ocular palsy
Conjunctivitis