Utilizing minicomputer technology for low-cost photorefraction: a feasibility study

Abstract

Eccentric photorefraction is an objective technique to determine the refractive errors of the eye. To address the rise in prevalence of visual impairment, especially in rural areas, a minicomputer-based low-cost infrared photorefractor was developed using off-the-shelf hardware components. Clinical validation revealed that the developed infrared photorefractor demonstrated a linear working range between +4.0 D and −6.0 D at 50 cm. Further, measurement of astigmatism from human eye showed absolute error for cylinder of 0.3 D and high correlation for axis assessment. To conclude, feasibility was shown for a low-cost, portable and low-power driven stand-alone device to objectively determine refractive errors, showing potential for screening applications. The developed photorefractor creates a new avenue for telemedicine for ophthalmic measurements.

The Development of Chicken Coop Automatic Remote Visual Monitoring System

“…However, commands via the Command Line Interface (CLI) can be used to operate the camera connected to the Raspberry Pi. The PiCamera module in Python is used to simplify the integration of camera operations with Python-based systems [15]. The monitoring system implemented the streaming feature that can be accessed from desktop and mobile web browsers, as well as video recording that will be stored in Google Drive using GDrive API.…”