the intraocular pressure (IOP) was increased in both eyes and was at 23; Caller states that she has been having sleepless nights; She starting experiencing something called "whirling. "She states that her head felt totally "giddy" for a few minutes after receiving the vaccine. She felt as if she had vertigo and that the world was just revolving around her; when she turned her head towards the window, it seemed as though she would fall down/She felt like she was losing her balance and had to hold on to the car at that moment; This spontaneous case was reported by a pharmacist and describes the occurrence of VERTIGO (She starting experiencing something called "whirling. "She states that her head felt totally "giddy" for a few minutes after receiving the vaccine. She felt as if she had vertigo and that the world was just revolving around her), BALANCE DISORDER (when she turned her head towards the window, it seemed as though she would fall down/She felt like she was losing her balance and had to hold on to the car at that moment), INTRAOCULAR PRESSURE INCREASED (the intraocular pressure (IOP) was increased in both eyes and was at 23) and INSOMNIA (Caller states that she has been having sleepless nights) in a 54-year-old female patient who received mRNA-1273.815 (SPIKEVAX 2023-2024) for COVID-19 prophylaxis.     The patient had no relevant medical history, no allergy and COVID-19 diagnosis were none.     On 05-Nov-2023, the patient received fifth dose of mRNA-1273.815 (SPIKEVAX 2023-2024) (unknown route) 1 dosage form. On 05-Nov-2023, the patient experienced VERTIGO (She starting experiencing something called "whirling. "She states that her head felt totally "giddy" for a few minutes after receiving the vaccine. She felt as if she had vertigo and that the world was just revolving around her), BALANCE DISORDER (when she turned her head towards the window, it seemed as though she would fall down/She felt like she was losing her balance and had to hold on to the car at that moment) and INSOMNIA (Caller states that she has been having sleepless nights). On 06-Nov-2023, the patient experienced INTRAOCULAR PRESSURE INCREASED (the intraocular pressure (IOP) was increased in both eyes and was at 23). On 05-Nov-2023, VERTIGO (She starting experiencing something called "whirling. "She states that her head felt totally "giddy" for a few minutes after receiving the vaccine. She felt as if she had vertigo and that the world was just revolving around her) had resolved. At the time of the report, BALANCE DISORDER (when she turned her head towards the window, it seemed as though she would fall down/She felt like she was losing her balance and had to hold on to the car at that moment), INTRAOCULAR PRESSURE INCREASED (the intraocular pressure (IOP) was increased in both eyes and was at 23) and INSOMNIA (Caller states that she has been having sleepless nights) was resolving.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 06-Nov-2023, Intraocular pressure test: increased in both eyes and was at 23.     For mRNA-1273.815 (SPIKEVAX 2023-2024) (Unknown), the reporter did not provide any causality assessments.   Concomitant medication not reported.   1st Dose on 29 Jan 2021 with unknown lot number, 2nd Dose on 25 Feb 2021 with Lot number 013M20A, 3rd Dose on 6 NOV 2021 with Lot number 039F21A, 4th Dose on 16 JUL 2022 with Lot number 17B22A.  The patient's whirling was gone in 5-6 minutes. Her eye pressure had normally been around 16.  Treatment medication not reported.   This case was linked to US-MODERNATX, INC.-MOD-2023-749506.