Design and implementation of a portable device for visual field testing

Inspired by the Humphrey Field Analyzer (HFA) device used in the diagnosis and monitoring of diseases such as glaucoma that cause vision loss, this study developed a low-cost, portable device application that is integrated with existing devices and has a design that facilitates patient use. The system design consists of mechanical, hardware, and software components. The mechanical design includes a visual stimulus box integrated with a special chin rest to ensure user ergonomics and reliable results. The hardware component features an LED-based visual stimulus circuit designed in a 24/2 pattern and controlled by an Arduino Mega microcontroller. The functionality of the hardware has been verified using Proteus simulation software. On the software side, a user interface has been developed using MATLAB Appdesigner, which enables two-way communication with the Arduino Mega microcontroller via a serial port. The developed visual field-testing system is a low-cost, easy-to-install, portable, and reliable system that does not require specialized technical personnel. Compared to commercial devices, the design eliminates motor noise associated with stimulus projection in HFA devices, making it quieter and less distracting for users. This study offers a cost-effective, user-friendly, and portable alternative to traditional visual field-testing devices for potential clinical diagnosis and patient education applications.