Inclusion Criteria:  Participant is 18 years of age or older.  Evaluable individuals with a prior confirmed SARS-CoV-2 infection with prior COVID-19 symptoms with symptoms onset > 14 days prior to the study, or symptoms onset 8-14 days prior to the study, or symptoms onset 0-7 days prior to study.OR  Evaluable individuals confirmed negative by SARS-CoV-2 RT-PCR using a sample obtained within 7 days prior to or on the day of the study.  Participant agrees to complete all aspects of the study.  Exclusion Criteria:  Participant has already participated in this study on a previous occasion. Participant is enrolled in a study to evaluate a new drug. Participant has a visual impairment that cannot be restored using glasses or contact lenses. Participant is unable or unwilling to provide informed consent. Participant is a vulnerable person as deemed unfit for the study by the Principal Investigator. Participant has a condition deemed unfit to safely perform the test by the investigator. Participant is a practising health-care professional or laboratory scientist / technician.