2023 Fiscal Year Final Research Report

Study of causes and treatments on acquired comitant esotropia in young Japanese.

Research Project

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Project/Area Number	20K09787
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 56060:Ophthalmology-related
Research Institution	Hamamatsu University School of Medicine
Principal Investigator	Sato Miho 浜松医科大学, 医学部, 准教授 (50252242)
Co-Investigator(Kenkyū-buntansha)	古森美和浜松医科大学, 医学部附属病院, 医員 (30467245) 鈴木寛子浜松医科大学, 医学部附属病院, 診療助教 (60867349) 彦谷明子浜松医科大学, 医学部附属病院, 講師 (80464113) 飯森宏仁愛媛大学, 医学部附属病院, 助教 (80838912) 清水瑞己浜松医科大学, 医学部附属病院, 医員 (40897815)
Project Period (FY)	2020-04-01 – 2024-03-31
Keywords	内斜視 / 急性内斜視 / スマートフォン / デジタルデバイス / 近視
Outline of Final Research Achievements	In cooperation with the Japanese Association for Strabismus and Amblyopia and the Japanese Society of Pediatric Ophthalmology, we enrolled young patients aged 5 to 35 years with acute acquired esotropia and investigated the effects of digital devices. The patients were interviewed about their use of digital devices before the onset of symptoms, instructed on how they use them, and interviewed again three months later to evaluate changes in strabismus and subjective symptoms. The results revealed that while elementary school students and younger had a large strabismus angle and small refractive errors, and often visited a doctor within one month of onset, older patients had more myopia and a smaller strabismus angle, and it took about six months from onset to visit a doctor. After instruction on how they use digital devices, it was found that strabismus improves, but only 6% of the patients achieved cure.
Free Research Field	斜視
Academic Significance and Societal Importance of the Research Achievements	後天性共同性内斜視という疾患は古くから知られていたが、スマートフォンの過剰使用がきっかけとなる症例の報告がされて以来、再度注目が集まっている。さまざまな原因でおきるが、今回の調査から、近視が強い人が多く、デジタルデバイスの長時間使用をやめることで改善することを明らかにした。また、過去に斜視や弱視があると内斜視が急に悪化することも明らかになった。いったん発症すると自然に治るのは極めて稀なので、予防方法や発症したときの対策についてさらに研究する必要がある。