Acute vision loss (noninflamed)

Background

Eye anatomy.

• This page describes a general approach to the complaint of acute vision loss with a quiet (noninflamed) eye
• Acute painless vision loss is an ophthalmologic emergency — several causes are time-sensitive
• Central retinal artery occlusion (CRAO) is a stroke equivalent with a narrow treatment window (<4.5-6 hours)
• Key distinguishing feature: painless vision loss in a quiet eye narrows the differential to primarily vascular and retinal etiologies
• Always check visual acuity in both eyes as a baseline

Clinical Features

Key Historical Features

• Monocular vs. binocular vision loss (binocular suggests central/neurologic cause)
• Onset: sudden (vascular) vs. gradual (optic neuritis, detachment progression)
• Transient vs. persistent: amaurosis fugax (transient monocular vision loss) suggests TIA/carotid disease
• Visual field deficit pattern: central (macular), peripheral (retinal detachment), altitudinal (branch artery/vein occlusion)
• Associated symptoms: headache, jaw claudication, scalp tenderness (giant cell arteritis), floaters/flashes (retinal detachment)
• Pain with eye movement (optic neuritis)

Physical Exam

• Visual acuity (each eye independently) — document with Snellen chart or near card
• Pupillary exam: relative afferent pupillary defect (RAPD/Marcus Gunn pupil) present in optic nerve or extensive retinal pathology
• Visual field testing by confrontation
• Extraocular movements
• Fundoscopy: look for pale retina with cherry red spot (CRAO), papilledema, retinal hemorrhages, retinal detachment

Differential Diagnosis

Acute Vision Loss (Noninflamed)

• 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)

^†Emergent Diagnosis

Vascular

• Central retinal artery occlusion (CRAO): painless sudden monocular vision loss, pale retina with cherry-red spot
• Central retinal vein occlusion (CRVO): painless monocular vision loss, "blood and thunder" fundus
• Amaurosis fugax: transient monocular vision loss, carotid embolic source
• Giant cell arteritis (GCA/temporal arteritis): vision loss (may be bilateral), headache, jaw claudication, elevated ESR/CRP
• Ischemic optic neuropathy (anterior or posterior)

Retinal

• Retinal detachment: flashes, floaters, "curtain" over visual field, pigmented cells in vitreous
• Vitreous hemorrhage: sudden painless vision loss, absent red reflex, history of diabetes/trauma

Neurologic

• Optic neuritis: painful eye movements, central vision loss, RAPD, associated with MS
• Stroke affecting visual cortex: binocular homonymous hemianopsia
• Papilledema from elevated ICP: bilateral vision changes, headache
• Pituitary apoplexy: bitemporal hemianopsia, headache

Evaluation

Bedside

• Visual acuity (each eye separately)
• Pupillary exam for RAPD
• Confrontation visual fields
• Fundoscopy (dilated if safe — avoid dilation if concern for neurologic cause requiring pupil monitoring)
• POCUS: ocular ultrasound can identify retinal detachment, vitreous hemorrhage, increased optic nerve sheath diameter (elevated ICP)
• Intraocular pressure (IOP) — elevated in acute angle closure (though this is typically painful/inflamed)

Laboratory

• ESR and CRP (STAT) if giant cell arteritis suspected — do not delay treatment
• CBC, BMP
• Glucose (diabetic retinopathy)
• Consider hypercoagulability workup for retinal vascular occlusion in young patients

Imaging

• CT/CTA head if stroke suspected
• MRI brain/orbits with gadolinium for optic neuritis
• Carotid duplex ultrasound or CTA neck for amaurosis fugax / CRAO (embolic source evaluation)

Management

Time-Sensitive Emergencies

• CRAO: true ophthalmologic emergency (treatment window <4.5-6 hours)
  • Emergent ophthalmology consultation
  • Consider ocular massage, anterior chamber paracentesis (ophthalmology)
  • Intra-arterial tPA may be considered at specialized centers
  • Evaluate for embolic source (carotid, cardiac)
• Giant cell arteritis: start high-dose IV methylprednisolone (1g/day) immediately if clinical suspicion high — do NOT wait for biopsy results
  • Temporal artery biopsy within 1-2 weeks (steroids do not affect biopsy for several days)
• Retinal detachment: emergent ophthalmology consultation for surgical repair
  • Macula-on detachments are more urgent (better visual outcomes with earlier repair)
• Optic neuritis: neurology and ophthalmology consultation; high-dose IV corticosteroids may hasten recovery

Non-Emergent

• CRVO: ophthalmology follow-up within 24-48 hours
• Vitreous hemorrhage: ophthalmology referral, head-of-bed elevation
• Amaurosis fugax: stroke workup (treat as TIA equivalent)

Disposition

Emergent Ophthalmology Consultation

• CRAO (within treatment window)
• Retinal detachment (especially macula-on)
• Giant cell arteritis with vision loss

Admit

• Giant cell arteritis (for IV steroids and monitoring)
• CRAO with concern for concurrent stroke
• Amaurosis fugax/TIA (per stroke protocol)
• Bilateral vision loss from neurologic cause

Discharge with Urgent Follow-Up

• CRVO: ophthalmology within 24-48 hours
• Vitreous hemorrhage (nontraumatic): ophthalmology within 24 hours
• Optic neuritis: neurology and ophthalmology within days
• Return precautions: worsening vision loss, new symptoms in other eye, headache, weakness

See Also

Eye Algorithms

• Red eye
  • Bilateral red eyes
  • Unilateral red eye
  • Red eye (by symptoms)
  • Red eye (peds)
    • Neonatal conjunctivitis
• Periorbital swelling
• Acute vision loss (noninflamed)
• Acute onset flashers and floaters
• Painful eyes with normal exam
• Neonatal eye problems
• Retinal detachment
• Central retinal artery occlusion
• Giant cell arteritis
• Amaurosis fugax