Totally blind; Cannot see with right eye,right eye has no vision,left eye's vision comes and goes; Vaccine messed me up; Symptoms got worst; Tingling in her left arm; Rash that spreaded to the back and front of arm; Redness on her arm at injection site; Fever; Felt fatigued; Nausea; Headache; Blurry vision, had difficulties to fill out the form.; Felt weakness; Diarrhea; This spontaneous case was reported by a consumer and describes the occurrence of BLINDNESS (Totally blind) and BLINDNESS UNILATERAL (Cannot see with right eye, right eye has no vision,left eye's vision comes and goes) in a 40-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 021C21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 16-Jul-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 17-Jul-2021, the patient experienced VISION BLURRED (Blurry vision, had difficulties to fill out the form.), ASTHENIA (Felt weakness), DIARRHEA (Diarrhea), PARAESTHESIA (Tingling in her left arm), RASH (Rash that spreaded to the back and front of arm), VACCINATION SITE ERYTHEMA (Redness on her arm at injection site), PYREXIA (Fever), FATIGUE (Felt fatigued), NAUSEA (Nausea) and HEADACHE (Headache). On 18-Jul-2021, the patient experienced CONDITION AGGRAVATED (Symptoms got worst). On an unknown date, the patient experienced BLINDNESS (Totally blind) (seriousness criterion medically significant), BLINDNESS UNILATERAL (Cannot see with right eye,right eye has no vision,left eye's vision comes and goes) (seriousness criterion medically significant) and FEELING ABNORMAL (Vaccine messed me up). The patient was treated with METOCLOPRAMIDE HYDROCHLORIDE (REGLAN [METOCLOPRAMIDE HYDROCHLORIDE]) at an unspecified dose and frequency and CEPHALEXIN [CEFALEXIN] at an unspecified dose and frequency. At the time of the report, BLINDNESS (Totally blind), BLINDNESS UNILATERAL (Cannot see with right eye,right eye has no vision,left eye's vision comes and goes), FEELING ABNORMAL (Vaccine messed me up), VISION BLURRED (Blurry vision, had difficulties to fill out the form.), ASTHENIA (Felt weakness), DIARRHEA (Diarrhea), CONDITION AGGRAVATED (Symptoms got worst), PARAESTHESIA (Tingling in her left arm), RASH (Rash that spreaded to the back and front of arm), VACCINATION SITE ERYTHEMA (Redness on her arm at injection site), PYREXIA (Fever), FATIGUE (Felt fatigued), NAUSEA (Nausea) and HEADACHE (Headache) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       Concomitant product use was not provided by the reporter. Treatment medications include IV Fluids. Patient reported that she went to ER on 20 Jul 2021.  Company comment: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.   Most recent FOLLOW-UP information incorporated above includes: On 16-Aug-2021: Follow up received on 16-AUG-2021, it contains significant information. Events were added.; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.