Microstructural and hemodynamic changes in the fundus after pars plana vitrectomy for different vitreoretinal...

Area of Science:

• Ophthalmology
• Retinal Surgery
• Medical Imaging

Background:

• Pars plana vitrectomy (PPV) is a standard surgical treatment for various vitreoretinal diseases.
• While PPV often restores fundus anatomy, postoperative visual outcomes can be unsatisfactory.
• Understanding factors influencing visual recovery is crucial for improving patient outcomes.

Purpose of the Study:

• To review and synthesize current literature on the association between postoperative microstructural and hemodynamic parameters and visual outcomes after PPV.
• To identify potential prognostic factors for visual recovery in common vitreoretinal diseases.

Main Methods:

• A comprehensive literature search was conducted on PubMed for studies published before December 2022.
• Keywords included "vitrectomy," specific diseases (e.g., "diabetic retinopathy"), and imaging modalities (e.g., "optical coherence tomography").
• Studies with sample size ≥7 and follow-up ≥4 weeks were included, focusing on retinal thickness, foveal avascular zone area, and vessel density.

Main Results:

• Results regarding microcirculatory changes and visual acuity in diabetic macular edema were contradictory.
• Inconsistent findings were observed for rhegmatogenous retinal detachment (RRD), idiopathic epiretinal membrane (iERM), and idiopathic macular hole (iMH).
• Specific correlations were noted: e.g., in macula-off RRD, vessel density and foveal avascular zone area showed varied associations with visual acuity depending on tamponade type (gas vs. silicone oil).

Conclusions:

• Microstructural and hemodynamic changes play a role in visual recovery after PPV for vitreoretinal diseases.
• Retinal layer thickness, foveal avascular zone area, and retinal capillary plexus vessel density are potential prognostic factors.
• The existing literature presents inconsistencies, necessitating further investigation to clarify these relationships.