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We present a Coronavirus disease 2019 (COVID-19) patient who developed sudden bilateral vision loss after a bilateral occipital ischemic stroke and without a history of stroke risk factors. An 84-year-old man was admitted to the emergency room with bilateral sudden vision loss while receiving Favipiravir treatment for 5 days following a COVID-19 diagnosis. The patient had no history of stroke risk factors, such as hypertension, diabetes mellitus, coronary artery disease, or arrhythmia. Diffusion magnetic resonance imaging of the patient revealed acute ischemia in the bilateral posterior occipital lobe and bilateral cerebellar hemisphere. We conclude that COVID-19 may rarely cause bilateral ischemic stroke presented only in the form of vision loss.

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Purpose: This study aimed to compare the neutrophil-to-lymphocyte (NLR) and plateletto- lymphocyte (PLR) ratios in patients with retinal artery occlusion (RAO) with those from a healthy control population and to identify the relationship between them. Methods: Forty-six patients with RAO and fifty-one healthy control subjects were included in this retrospective case-control study. RAO was diagnosed following an ophthalmic examination and fluorescein angiography (FA). Blood neutrophil, lymphocyte, and platelet counts were recorded for each of the 97 subjects, from which NLR and PLR values were calculated. Results: There were 46 patients (28 male [M], 18 female [F]) in the RAO group and 51 patients (27 M, 24 F) in the control group. No significant differences were found between patients with RAO and the control subjects in terms of gender and age (P > 0.05). Patients with RAO had significantly increased NLR values (2.85 ± 1.70) than the control subjects (1.63 ± 0.59, P < 0.001). The mean PLR in patients with RAO was 123.69 ± 64.98, while that in control subjects was 103.08 ± 36.95; there was no significant difference between the two groups (P = 0.055). A logistic regression analysis revealed that NLRs were 3.8 times higher in patients with RAO than in control subjects (odds ratio = 3.880; 95% confidence interval = 1.94 to 7.74; P < 0.001). Conclusion: NLRs were significantly increased in patients with RAO compared to the control subjects.