Blurry vision; light headed; received a dose of the Pfizer COVID Vaccine on 14/Aug/2021 but actually received a dose of the Moderna vaccine on 23/Jul/2021; received a dose of the Pfizer COVID Vaccine on 14/Aug/2021 but actually received a dose of the Moderna vaccine on 23/Jul/2021; This is a spontaneous report from a contactable consumer or other non-health professional (patient). A 54-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, lot number EW0177; Expiration Date: Aug2021), dose 2 via an unspecified route of administration, administered in Arm Left on 14Aug2021 (at the age of 54 years) as dose 2 (initial Pfizer dose), single for covid-19 immunisationMedical history included High Blood Pressure from an unknown date and unknown if ongoing, allergy to seafood from an unknown date and unknown if ongoing. The patient concomitant medications were reported as she takes high blood pressure medication. Reportedly, patient received historical vaccine covid-19 vaccine mrna (mrna 1273) (MODERNA COVID-19 VACCINE, Batch/Lot number was not reported, 027C21A, does not know if this is the lot number or not, it also says Clinic site LCHCS), via an unspecified route of administration in arm left on 23Jun2021 (at the age of 54 years), at dose 1, single for covid-19 immunisation and had soreness in left arm. On 15Aug2021, patient experienced blurry vision and light headed. The patient received a dose of the Pfizer covid vaccine on 14Aug2021 but actually received a dose of the Moderna vaccine on 23Jun2021. She mentioned that the nurse from her doctor's office specifically told her and it would not hurt. She was then called on a latter date and mentioned that it was not actually okay. She is asking if this is true. She mentioned that she received her vaccination from MUSC Health. Patient called about the Pfizer Covid 19 Vaccine. She was supposed to get vaccinated with the Moderna covid Vaccine for her second dose, but instead on 14Aug2021 when she came to the doctors she received the Pfizer covid 19 vaccine. She had already told the nurse that she had Moderna Covid Vaccine on 23Jun2021 as her first dose, but the nurse just dismissed her, that it was going to be okay. She was then later informed that it should not be like that. Nurse told her it would not matter if she got he Pfizer covid vaccine as her second dose. Patient stated that all of this is scary to her. Patient clarified that she got the first dose Moderna Covid Vaccine at her Primary Care doctors office, but the second dose Pfizer COVID Vaccine she received was like a pop up site, set up just to give out the vaccines at the (withheld) Community Center. It was a registered Nurse at the pop up site that told her getting the Pfizer Vaccine would be okay. It was later that her primary Care office that contacted her telling her that it should not be that way. Patient had took the Moderna first dose, she already had one dose of the Moderna and she give her the dose of the Pfizer, it should not have been mixed like that. Patient needed light and she could not see the doctor contact information. The patient reported that she has blurry vision for a couple hours. That's why she called the doctor they told her it would go away. She further clarified that the blurry vision was after receiving the Pfizer covid vaccine and it started the day after on 15Aug2021. She got the Pfizer vaccine she waited 15 minutes and she was fine then but it started to bother her Sunday evening, she was thinking to herself why was she light headed, maybe because of the shot. The Next day she had blurry vision on 15Aug2021 it was ongoing and getting worse and she does not know what was going on. Patient reported she takes high blood pressure medication, but it could not even be that or could it be her blood pressure. With the Moderna Vaccine she had no issues just that her arm was sore. Only thing she had was soreness in my left arm and she took Tylenol (Treatment). She took Tylenol for the soreness in her arm from the shot. Patient asked was her life in jeopardy for doing this, they told her sorry that the nurse told her that. She should have probably listened to her husband and that she was right in questioning it, but the lady had qualifications, she was a registered Nurse and told there would be no complications between the 2. Patient reported her blood sugar was not total out of control (further not clarified hence, not captured). Patient take one tablet in the morning for that. The most of the medicine she was on was high blood pressure (further not clarified). Patient asked her would it be effective if she had took the Moderna first dose and she wanted to have the Pfizer, would that be effective, would that be okay for me to take the Pfizer. The report was not related to a study or programme. Reporter seriousness was unspecified. Blurry vision was reported as worsened. The outcome of the event blurry vision was not recovered and light headed was unknown.  No follow-up attempts are possible. No further information is expected.