https://www.medrxiv.org/content/10.1101/2023.02.15.23285584v1
Post-COVID syndrome is associated with capillary alterations, macrophage infiltration and distinct transcriptomic signatures in skeletal muscles. PREPRINT.

https://pubmed.ncbi.nlm.nih.gov/35081000/
Özbaş M, Demirayak B, Vural A, Karabela Y, Yigit FU. Investigation of Retinal Alterations in Patients Recovered from COVID-19: A Comparative Study. Ocul Immunol Inflamm. 2023 Feb;31(2):252-256. doi: 10.1080/09273948.2021.2024581. Epub 2022 Jan 26. PMID: 35081000.
Die Untersuchung bezog sich auf Personen mit PCR-confirmed SARS-CoV-2 infection im Vergleich zu Kontrollen; „echte“ Long- oder Post-COVID-Patienten wurden nicht untersucht.
Conclusion: : There isn’t any relevant difference between early post-COVID-19 patients and general population in terms of retinal microvascularity.

https://pubmed.ncbi.nlm.nih.gov/35634955/
Wang S, Wang J, Hu J, Wang N. Retinal microvascular impairment in COVID-19 patients: A meta-analysis. Immun Inflamm Dis. 2022 Jun;10(6):e619. doi: 10.1002/iid3.619. PMID: 35634955; PMCID: PMC9091999.
Untersuchung an „nonacute infectious COVID-19 or post-COVID-19 patients“.
Conclusion: The patients of nonacute infectious COVID-19 or post-COVID-19 displayed alterations in the retinal microvasculature and choroidal vessels, including a significantly lower foveal VD in deep capillary plexus and thinner SCT. The impairment may be a medium to long-term process. Close ophthalmic surveillance is necessary for COVID-19 patients or post-COVID-19 patients.