Optic neuritis/one eye was blurry. Then one day she happen to close one eye and the other way blurry; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 64 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 19Dec2021 (Lot number: 33130BA, Expiration Date: Feb2022) at the age of 64 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "chronic hives" (unspecified if ongoing), notes: Verbatim:chronic hives; "lot of allergies so the only vaccine they let her get or advised was to get the covid vaccine" (unspecified if ongoing), notes: lot of the allergies so the only vaccine they let her get or advised was to get the covid vaccine. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose Number:01, LOT Number: EW0177, Expiration Date: Aug2021, Anatomical Location of Administration of Pfizer vaccine considered as suspect: caller states left arm every time.), administration date: 26May2021, when the patient was 64 years old, for Covid-19 Immunization; Bnt162b2 (Dose Number:02, LOT Number: EW0191, Expiration Date: Sep2021, Anatomical Location of Administration of Pfizer vaccine considered as suspect: caller states left arm every time.), administration date: 18Jun2021, when the patient was 64 years old, for Covid-19 Immunization. The following information was reported: OPTIC NEURITIS (caused and prolonged hospitalization, medically significant) with onset Jan2022, outcome "not recovered", described as "Optic neuritis/one eye was blurry. Then one day she happen to close one eye and the other way blurry". The patient was hospitalized and prolonged hospitalization for optic neuritis (start date: 01Feb2022, discharge date: 05Feb2022, hospitalization duration: 5 day(s)). The event "optic neuritis/one eye was blurry. then one day she happen to close one eye and the other way blurry" was evaluated at the physician office visit and emergency room visit. The patient underwent the following laboratory tests and procedures: biopsy: unknown result, notes: They did a temple biopsy, they wanted to make sure her veins in her head weren't closing up or getting too thin; blood test: unknown result; computerised tomogram: unknown result; urine analysis: unknown result. Therapeutic measures were taken as a result of optic neuritis. Clinical Information: Reporter mentioned that, No other Products administered. Patient had both the Pfizer shots and the booster on 23Dec2021, she did well, thought she did, three weeks later, in Jan2022, she developed optic neuritis. She went to the hospital and all kinds of stuff. Caller clarifies optic neuritis as swelling of the optic nerve behind the eye. Caller explains that she had blurry vision in the middle of Jan2022, about 3 weeks after the shot. Somebody told her it was conjunctivitis, and she was misdiagnosed, then it progressively got worse, and they sent her to the hospital. After discharged from hospital, Doctor was concerned saying that she needed more testing like an MRI and she ended up going to the hospital.Caller states she is on prednisone and is foggy. She said everything isnt clear like it normally is.Regarding concomitant medications and medical history, caller states she gets shots for chronic hives and she has been on those for like 7 years. Reporter states while in the hospital she had blood work, a lot of stuff, a lot of black and blue marks. Thats why she is going to the neurologist, some of the numbers were out of whack. Vaccination Facility Type reported as Pharmacy. No additional Vaccines Administered on Same Date of the Pfizer Suspect. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s): Caller states she has a lot of the allergies so the only vaccine they let her get or advised was to get the covid vaccine, she doesnt get the flu shot, shingles or anything else. Caller states that she receive allergy shots, No additional lot numbers, caller states she gets them at the doctors office every two weeks. No AE(s) following prior vaccinations. Patient had no Medical History (including any illness at time of vaccination), Caller state she felt pretty good after. No Family Medical History Relevant to AE(s). None or Unknown Relevant Tests. In the hospital they did CT scans, urine ones a couple of times, she doesnt remember the number times, treated with prednisone. Caller clarifies when in the hospital she received Prednisone 60mg intravenously for 5 days.  She came home with the pills to take at home. The Prednisone is down to 40mg, she is doing a taper, she was doing 50mg now down to 40 mg once day, by mouth.  Caller states they gave her two different prescriptions. She has 20mg pills and 10mg in pharmacy bottles. No NDC/Lot/Expiration to provide.  Follow-up attempts are completed. No further information is expected.