Ellipsoid Zone Integrity and Visual Acuity Changes during Diabetic Macular Edema Therapy: A Longitudinal Study

Area of Science:

• Ophthalmology
• Medical Imaging
• Biomarker Research

Background:

• Diabetic macular edema (DME) significantly impacts visual acuity (VA).
• Ellipsoid zone (EZ) integrity is a potential biomarker for monitoring DME treatment.
• Long-term outcomes of EZ changes in DME patients receiving anti-VEGF therapy require further investigation.

Purpose of the Study:

• To describe long-term VA and anatomical outcomes in DME patients treated with anti-VEGF therapy.
• To assess changes in spectral domain optical coherence tomography (OCT) parameters, including EZ reflectivity ratio, central macular thickness, and volume.
• To investigate the correlation between EZ integrity and changes in VA over 5 years.

Main Methods:

• Retrospective analysis of 71 eyes from 71 DME patients.
• Yearly review of clinical characteristics and OCT data (baseline, 1, 3, and 5 years).
• Automatic quantification of EZ parameters and correlation with visual outcomes using multivariable regression models.

Main Results:

• EZ reflectivity ratio correlated with VA outcomes throughout the 5-year study period (p < 0.05).
• Both EZ reflectivity and VA improved significantly within the first year of treatment (p < 0.05 and p < 0.001, respectively).
• VA and EZ parameters at baseline predicted 1-year VA outcomes, and year 1 data predicted year 2 outcomes.

Conclusions:

• Long-term anti-VEGF therapy in DME patients shows a dynamic course of EZ changes.
• EZ parameters demonstrate potential as novel OCT biomarkers for predicting VA outcomes in DME.
• The study highlights the utility of EZ integrity in assessing treatment efficacy and prognosis for DME patients.