This study aimed to explore the relationship between smartphone use impact on the mean triad and potential pre-existent risk factors for acute acquired comitant esotropia (AACE). A prospective study of 18 university staff and students aged 24 years (SD 7.7) was undertaken. Measurements (both eyes open and right / left eye) were taken for near point accommodation, convergence and accommodative facility pre and post 30 minutes of phone use. Near point accommodation and convergence measures receded and accommodative facility increased. However, these were not statistically or clinically significant. Limitations for this study were the small sample size and short period of phone use. A large study is required with considerations on how best to capture phone use and study measures.