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Related Experiment Video

Updated: Mar 25, 2026

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability
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Central retinal vein occlusion: modifying current treatment protocols.

M Ashraf1, A A R Souka1, R P Singh2

  • 1Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt.

Eye (London, England)
|February 13, 2016
PubMed
Summary

Anti-VEGF therapy is standard for central retinal vein occlusion (CRVO), but long-term gains vary. A pro re nata (PRN) regimen shows effectiveness comparable to monthly injections for sustained vision improvement in CRVO patients.

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Area of Science:

  • Ophthalmology
  • Retinal Vascular Diseases
  • Pharmacological Treatments

Background:

  • Central retinal vein occlusion (CRVO) is a prevalent condition causing significant vision loss.
  • Anti-vascular endothelial growth factor (anti-VEGF) therapies are established treatments for CRVO.
  • Variability in patient response and long-term visual outcome maintenance necessitates treatment optimization.

Purpose of the Study:

  • To review randomized clinical trials (RCTs) evaluating anti-VEGF agents and steroids for CRVO.
  • To assess the long-term efficacy of different treatment protocols, including pro re nata (PRN).
  • To propose an updated treatment algorithm for improved long-term outcomes in CRVO patients.

Main Methods:

  • Analysis of major RCTs (CRUISE, HORIZON, RETAIN, GALILEO, COPERNICUS) on anti-VEGFs for CRVO.
  • Inclusion of studies (SCORE, GENEVA) examining steroid therapy as a first-line option.
  • Exploration of alternative treatments like laser therapy and agent switching for non-responders.

Main Results:

  • Anti-VEGFs are effective, but sustained visual gains vary among patients.
  • Poor responders to anti-VEGFs often show early signs of limited efficacy.
  • Pro re nata (PRN) treatment protocols demonstrate effectiveness in improving and maintaining vision long-term, comparable to monthly injections.
  • Steroids may have a role in specific CRVO cases, warranting further investigation.

Conclusions:

  • Treatment strategies for CRVO should account for individual patient response variability.
  • Pro re nata (PRN) regimens offer a viable and effective approach for long-term vision management in CRVO.
  • A simplified, modified treatment algorithm can enhance long-term outcomes for all CRVO patient types.