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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Ophthalmology

Emergency Response: Time-Sensitive Treatments for Eye Strokes

At a Glance

Central Retinal Artery Occlusion (CRAO), or an eye stroke, is a medical emergency requiring immediate treatment. The most effective treatment is intravenous thrombolysis (tPA) given within 4.5 hours of symptom onset. Hyperbaric Oxygen Therapy (HBOT) may be used up to 24 hours after symptoms start.

When a Central Retinal Artery Occlusion (CRAO) occurs, the medical community treats it with the same urgency as a stroke in the brain. Because the retina is brain tissue, it is extremely sensitive to a lack of oxygen [1]. Emergency treatment focuses on two main goals: restoring blood flow to the eye as quickly as possible and ensuring your overall vascular system is stable [2][3].

The Modern “Eye Stroke” Protocol

Many specialized hospitals now use an “Eye Stroke Code” [4]. This protocol brings together a multidisciplinary team—including ophthalmologists (eye surgeons), neurologists (brain specialists), and cardiologists (heart specialists)—to evaluate you simultaneously [2][5].

Phase 1: Thrombolysis (The 4.5-Hour Window)

The most potent emergency treatment is intravenous thrombolysis (often using a drug called alteplase or tPA). This medication is designed to dissolve the clot causing the blockage [6].

  • The Window: Evidence suggests this is most effective when given within 4.5 hours of the first symptom [6][4].
  • The Debate: While some studies show significant vision improvement, others highlight risks like internal bleeding [7][8]. Your doctors will carefully weigh your individual risk factors before recommending this [9].

Phase 2: Hyperbaric Oxygen Therapy (The 6–24 Hour Window)

If thrombolysis is not an option, or if the 4.5-hour window has passed, Hyperbaric Oxygen Therapy (HBOT) may be considered [10].

  • How it Works: You sit in a pressurized chamber breathing 100% oxygen. This “forces” extra oxygen into your bloodstream, which can keep the retina alive even while the artery is blocked [10][11].
  • The Timing: Patients often see the most benefit when HBOT is started within 9 to 24 hours of symptom onset [12][13]. It is sometimes used as a “rescue therapy” for those who arrive too late for other treatments [14].

Conservative Treatments: An Evolving View

In the past, doctors frequently used “conservative” methods to try and dislodge the clot. While these are still sometimes performed, recent research suggests they may not be as effective as once thought [15][16]. These include:

  • Ocular Massage: Applying rhythmic pressure to the eye to try and manually move the clot [15].
  • Anterior Chamber Paracentesis: Removing a tiny drop of fluid from the front of the eye to quickly lower eye pressure, hoping to pull blood flow forward [15].
  • Pressure-Lowering Drops: Using medications to reduce the internal pressure of the eye [15].

Treatment Decision Timeline

Time Since Onset Primary Goal Likely Interventions
0–4.5 Hours Re-opening the Artery IV-Thrombolysis (alteplase), Eye Stroke Code activation [6]
4.5–24 Hours Retinal Oxygenation Hyperbaric Oxygen (HBOT), specialized imaging (MRI/OCT) [12]
24+ Hours Prevention & Recovery Stroke workup (Heart/Neck), risk factor management [17]

Important Note: Please do not try to self-triage your time window. Even if you believe you are past the 4.5-hour mark, immediate emergency care is still required to perform a full stroke workup and prevent a potential brain stroke [17]. Spontaneous improvement can occasionally occur, and addressing vascular health immediately is critical [18].

Common questions in this guide

Am I within the time window for clot-busting medication for an eye stroke?
Intravenous thrombolysis, or tPA, is most effective when given within 4.5 hours of your first vision loss symptoms. Your medical team will determine if you are a candidate based on the exact time your symptoms began and your personal bleeding risk factors.
What is Hyperbaric Oxygen Therapy for an eye stroke?
Hyperbaric Oxygen Therapy involves breathing 100% oxygen in a pressurized chamber to force extra oxygen to the retina. It is typically considered if you are outside the 4.5-hour window for clot-busting drugs but within 9 to 24 hours of symptom onset.
Do traditional treatments like eye massage still work for an eye stroke?
Older conservative treatments like ocular massage, pressure-lowering drops, and removing fluid from the eye are still sometimes used. However, recent research suggests they may not be as effective as rapid intervention with thrombolysis or hyperbaric oxygen therapy.
What is an Eye Stroke Code?
An Eye Stroke Code is an emergency hospital protocol that treats a retinal blockage with the same urgency as a brain stroke. It rapidly brings together eye surgeons, neurologists, and cardiologists to evaluate and treat you simultaneously.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Am I still within the 4.5-hour window for intravenous thrombolysis (clot-busting medication)?
  2. 2.Do we have access to Hyperbaric Oxygen Therapy (HBOT) here, and would I benefit from it within the first 24 hours?
  3. 3.Are you using an 'Eye Stroke Code' protocol to involve neurologists and cardiologists in my care?
  4. 4.What are the specific risks for me if we use thrombolytic medications like alteplase?
  5. 5.If conservative treatments like ocular massage are used, is there evidence they will help my specific type of blockage?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (18)
  1. 1

    A review of the management of central retinal artery occlusion.

    Madike R, Cugati S, Chen C

    Taiwan journal of ophthalmology 2022; (12(3)):273-281 doi:10.4103/2211-5056.353126.

    PMID: 36248088
  2. 2

    Eye stroke protocol in in the emergency department.

    Bénard-Séguin É, Nahab F, Pendley AM, et al.

    Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association 2024; (33(9)):107895 doi:10.1016/j.jstrokecerebrovasdis.2024.107895.

    PMID: 39079617
  3. 3

    Acute Central Retinal Artery Occlusion Seen within 24 Hours at a Tertiary Institution.

    Chan W, Flowers AM, Meyer BI, et al.

    Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association 2021; (30(9)):105988 doi:10.1016/j.jstrokecerebrovasdis.2021.105988.

    PMID: 34271275
  4. 4

    Management of Central Retinal Artery Occlusion: A Scientific Statement From the American Heart Association.

    Mac Grory B, Schrag M, Biousse V, et al.

    Stroke 2021; (52(6)):e282-e294 doi:10.1161/STR.0000000000000366.

    PMID: 33677974
  5. 5

    Acute ischemic stroke in young women secondary to atherosclerosis: a unique ophthalmic presentation with central retinal artery occlusion: a case report.

    Moutamani S, Boutaj T, Ennejjar A, et al.

    The Pan African medical journal 2022; (41()):189 doi:10.11604/pamj.2022.41.189.33147.

    PMID: 35655682
  6. 6

    Intravenous Fibrinolysis for Central Retinal Artery Occlusion: A Cohort Study and Updated Patient-Level Meta-Analysis.

    Mac Grory B, Nackenoff A, Poli S, et al.

    Stroke 2020; (51(7)):2018-2025 doi:10.1161/STROKEAHA.119.028743.

    PMID: 32568646
  7. 7

    A Randomized Trial of Tenecteplase in Acute Central Retinal Artery Occlusion.

    Ryan SJ, Jørstad ØK, Skjelland M, et al.

    The New England journal of medicine 2026; (394(5)):442-450 doi:10.1056/NEJMoa2508515.

    PMID: 41604638
  8. 8

    Intraocular hemorrhage in patients misdiagnosed with central retinal artery occlusion treated with thrombolysis.

    Adamkiewicz DV, Leal C, Yan KY, et al.

    Frontiers in neurology 2025; (16()):1631546 doi:10.3389/fneur.2025.1631546.

    PMID: 40909000
  9. 9

    Successful recovery of vision following intravenous thrombolysis using low-dose alteplase in central retinal artery occlusion.

    Tanaka S, Hayakawa M, Tasaki K, et al.

    The American journal of emergency medicine 2025; (87()):216.e5-216.e9 doi:10.1016/j.ajem.2024.11.017.

    PMID: 39542820
  10. 10

    CASE SERIES OF HYPERBARIC OXYGEN THERAPY FOR CENTRAL RETINAL ARTERY OCCLUSION.

    Masters TC, Westgard BC, Hendriksen SM, et al.

    Retinal cases & brief reports 2021; (15(6)):783-788 doi:10.1097/ICB.0000000000000895.

    PMID: 31306292
  11. 11

    [Hyperbaric oxygen therapy and eye disease: Review of the literature].

    Bastelica P, Florentin G, Baudouin C, Labbé A

    Journal francais d'ophtalmologie 2024; (47(4)):104107 doi:10.1016/j.jfo.2024.104107.

    PMID: 38430627
  12. 12

    Outcomes of Hyperbaric Oxygen Treatment for Central Retinal Artery Occlusion: A Single Center Experience.

    Kim BM, Wang KY, Xu TT, et al.

    American journal of ophthalmology 2025; (269()):393-401 doi:10.1016/j.ajo.2024.09.027.

    PMID: 39368618
  13. 13

    Visual Outcomes Following Hyperbaric Oxygen Therapy in Acute Central Retinal Artery Occlusion Patients.

    Thoongsuwan S, Sirichayaporn T, Rodanant N, et al.

    Clinical ophthalmology (Auckland, N.Z.) 2025; (19()):3419-3429 doi:10.2147/OPTH.S510772.

    PMID: 40989067
  14. 14

    Visual outcomes of central retinal artery occlusion: Exploring treatment strategies beyond the conventional time window.

    Yang CC, Weng CC, Chou YB, et al.

    Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association 2025; (34(3)):108240 doi:10.1016/j.jstrokecerebrovasdis.2025.108240.

    PMID: 39809373
  15. 15

    Central retinal artery occlusion as a neuro-ophthalmological emergency: the need to raise public awareness.

    Hoyer C, Kahlert C, Güney R, et al.

    European journal of neurology 2021; (28(6)):2111-2114 doi:10.1111/ene.14735.

    PMID: 33452753
  16. 16

    Progress in central retinal artery occlusion: a narrative review.

    Liu W, Bai D, Kou L

    The Journal of international medical research 2023; (51(9)):3000605231198388 doi:10.1177/03000605231198388.

    PMID: 37712755
  17. 17

    Stroke Risk Before and After Central Retinal Artery Occlusion in a US Cohort.

    Chodnicki KD, Pulido JS, Hodge DO, et al.

    Mayo Clinic proceedings 2019; (94(2)):236-241 doi:10.1016/j.mayocp.2018.10.018.

    PMID: 30711121
  18. 18

    Vitrectomy With Intrasurgical Control of Ocular Hypotony as a Treatment for Central Retina Artery Occlusion.

    Nadal J, Ding Wu A, Canut M

    Retina (Philadelphia, Pa.) 2015; (35(8)):1704-5 doi:10.1097/IAE.0000000000000702.

    PMID: 26200517

This page is for informational purposes only and is not a substitute for immediate emergency medical care. If you suspect you are having an eye stroke, seek emergency medical attention immediately or call 911.

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