In this article, we describe the case of a 70-year-old man whose diagnosis of a brain meningioma was hindered by a SARS-CoV-2 infection. The patient, who had been vaccinated twice with the AstraZeneca COVID-19 vaccine, was admitted to Temporary Hospital No. 2, University Hospital (Białystok, Poland) with a positive PCR test result for SARS-CoV-2. The patient's general condition was good, but he reported a significant reduction in visual acuity in his left eye and headaches. A series of ophthalmological examinations were conducted, but they did not clarify the cause of the significant decrease in visual acuity. During hospitalization, an abnormal light reaction of the left pupil was observed, which led to the expansion of diagnostics to include imaging studies (CT and MRI). Computed tomography and magnetic resonance imaging revealed extensive isointense areas in the anterior cranial fossa, suggesting the presence of a meningioma. The final diagnosis and clarification of the cause of the visual impairment in the left eye resulted in the patient being transferred to the neurosurgery department for surgical treatment. COVID-19 diagnosis may mask the correct interpretation of other disease symptoms. Accidentally detected asymptomatic SARS-CoV-2 infection accelerated proper ophthalmic and neurology diagnosis.