A Low-Cost Customizable Multi-Parameter Eye- Health Monitoring System for Adolescent Myopia Prevention

In recent years, the prevalence of myopia among adolescents has increased continuously. Improper viewing distance, inappropriate ambient illumination, and prolonged continuous near‑work are the major inducing factors for visual impairment. Aiming at the drawbacks of existing eye‑protection devices, such as single‑function design, fixed‑parameter configuration and poor adaptability, this paper designs a multi-parameter intelligent eye-protection monitoring system with user-customizable thresholds based on a 51-series microcontroller. The system integrates an ultrasonic ranging module, an analog-to-digital converter illumination acquisition circuit, a key‑operated threshold adjustment interface, a liquid-crystal display module, and an audio‑visual alarm unit. Different from conventional fixed‑threshold schemes, the proposed system adopts user‑customizable thresholds. The audio‑visual alarm will be automatically triggered once any of the indicators including illumination intensity, viewing distance or eye‑using duration exceeds the preset safety thresholds. Proteus simulation and physical prototype test results demonstrate that the ranging error of the system is within ± 1 cm, the illumination acquisition error is less than 5%, and the abnormal‑event response time is lower than 1 s. Featuring low cost, simple human‑computer interaction and favorable expandability, the system can effectively assist users in standardizing their eye‑using behaviors and possesses promising practical application prospects.