COVID-19(27) SARS-CoV-2(12) photodynamic therapy(11) COVID-19 infection(9) Optical coherence tomography(9) therapy(8) virus(8) eyes(7) parameters(7) COVID-19 pandemic(7) approach(6) visual acuity(6) SARS-COV-2 infection(6) Retinal(6) cross-sectional(6) Antimicrobial photodynamic therapy(6) vessel(6) Foveal avascular zone(6) age(6) significant difference(6) group(6) Diagnosis(6) antimicrobial(5) occur(5) Varicella-zoster virus.(5) Oral decontamination(5) Laser(5) Viral load(5) swept-source optical coherence tomography(5) reduction(5)