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A One-Step, Streamlined Children’s Vision Screening Solution Based on Smartphone Imaging for Resource-Limited Areas: Design and Preliminary Field Evaluation

A One-Step, Streamlined Children’s Vision Screening Solution Based on Smartphone Imaging for Resource-Limited Areas: Design and Preliminary Field Evaluation

Assuming the frontal plane pixel scale is α mm per pixel, the eyeball diameter is d mm, and the gap between the camera and the flash is ignorable, the axial deviations of each eye from the camera/flash-ocular axis is as follows: Where tan–1() is the inverse tangent function. In this solution, d is unmeasurable and is thus set to an average of 20 mm [26].

Shuoxin Ma, Yongqing Guan, Yazhen Yuan, Yuan Tai, Tan Wang

JMIR Mhealth Uhealth 2020;8(7):e18226