Circuit and Sensor Design for Smartphone-Based Electroretinography

Electroretinography (ERG) devices use brief light flashes to measure electrical responses near the eye. In recent studies, this was found to indicate that the patient may have certain neurodevelopmental disorders, like autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD). However, these devices costly and scarce. The proposed smartphone-based solution aims to address this, enabling affordable ERG readings. By using a smartphone flashlight, the device processes ERG signals through a signal processing circuit to a microcontroller on a PCB, then sends data to an Android phone for averaging and display. The ERG signals are finally visualized on the smartphone screen that is accessed through a smartphone app. The ease with which the ERG test is performed could enhance the number of evaluations and monitoring of the patients by a doctor.