Development of an Individualized 3D Printed Visual & Tactile Tool: Enhancing Visual Perception for the Argus II Retinal Prosthesis.

Abstract

Purpose : The ability to interpret the artificial visual stimulus created by the Argus II retinal prosthesis can vary with the user’s perceptual capabilities. Outcomes and proficient use may be improved through consistent training with self-administered rehabilitation tools in the home setting. An individualized 3D printed tool that allows the user to integrate both tactile and visual stimulus could help deliver personalized, in home ultra-low vision rehabilitation. This study investigates the feasibility of training with an individualized tool designed to improve shape and pattern recognition as well as spatial awareness.

Methods : Using CAD software, a board with an integrated grid for holding colored tokens was designed and printed using a 3D printer (Figure 1). Additionally, a holder was designed and printed to support the board at a comfortable angle, facilitating image capture by the Argus II camera. The initial board grid and tokens was mailed to the patient, and feedback describing visualization were shared. This iterative design cycle was repeated three times, until a token size, color and board grid spacing was achieved, such that the patient could easily visualize the tokens and create shapes and patterns. Using a mobile phone, the patient transmitted videos and photos of shapes and patterns, with audio descriptions of the visualization experience (Figure 2).

Results : A custom visual-tactile rehabilitation tool was created based on an interactive design process, with detailed feedback from a collaborating Argus II recipient. The patient was able to utilize the board for various visual exercises utilizing tactile feedback and provide constructive criticism for design improvement. The customized angle of the board minimized neck strain and reduced glare. This customizable tool introduced variability in daily exercises aimed to improve perception capabilities of patients implanted with the Argus II retinal prosthesis.

Conclusions : Incorporating a customized visual tactile tool for ultra-low vision rehabilitation at a patient’s home can improve interpretation of the visual precepts delivered by the Argus II retinal prosthesis. In addition, the interactive, exploratory design process, increased patient engagement, with self-report indicating an increased Argus II retinal prosthesis utilization.

This is a 2021 ARVO Annual Meeting abstract.

 

Figure 1

 

Figure 2