Development of a Subjective Visual Vertical Test System Using a Smartphone With Virtual Reality Goggles for Screening of Otolithic Dysfunction: Observational Study

Akiko Umibe   ^{1, 2} , MD, PhD ;   Hiroaki Fushiki   ² , MD, PhD ;   Reiko Tsunoda   ² , MD, PhD ;   Tatsuaki Kuroda   ^{2, 3} , MD ;   Kazuhiro Kuroda   ³ , MD ;   Yasuhiro Tanaka   ¹ , MD, PhD

¹ Department of Otorhinolaryngology, Head and Neck Surgery, Dokkyo Medical University Saitama Medical Center, Koshigaya-shi, Saitama, Japan

² Department of Otolaryngology, Mejiro University Ear Institute Clinic, Saitama-shi, Saitama, Japan

³ Kuroda Ear, Nose and Throat Clinic, Yatsushiro-shi, Kumamoto, Japan