Design of an Augmented Reality Magnification Aid for Low Vision Users
Lee Stearns, Leah Findlater, Jon E. Froehlich · 2018 · Proceedings of the 20th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS '18) · doi:10.1145/3234695.3236361
Summary
This paper explores the design space for augmented reality magnification aids for people with low vision, developing and iteratively refining two prototype systems using the Microsoft HoloLens. Unlike existing head-mounted displays that simply magnify 2D video from a camera, this work leverages true AR capabilities to anchor magnified virtual content in 3D physical space — enabling novel interactions like placing a magnified view on a wall, having it track a handheld object, or keeping it fixed relative to the user's head. The research involved nine design sessions across two prototype iterations with seven visually impaired participants (ages 28-68, with conditions including LHON, retinitis pigmentosa, optic atrophy, cone-rod dystrophy, albinism, and high myopia). The first prototype paired the HoloLens with a finger-worn camera and offered four display modes: Fixed 2D (attached to headset), Fixed 3D Vertical and Horizontal (anchored in physical space), and Finger Tracked (following the user's hand like a magnifying glass). The second prototype replaced the finger camera with an iPhone X for better image quality and refined the display modes to three: Attached to Headset, Attached to World, and Attached to Phone, with touchscreen controls and color filter options.
Key findings
Participants identified compelling advantages to AR magnification over existing aids: portability (always available without carrying separate devices), privacy (more discreet than holding a phone to your face), ready availability (no setup needed), a more natural reading experience (reading a full page rather than scanning line by line), and the ability to multitask (turning away from the display to speak with someone, then turning back). One participant described the system as "everything I need as far as being able to read independently." Display preferences varied significantly by visual condition — participants with tunnel vision preferred the Attached to Headset mode for simplicity, while others favored Attached to World for its CCTV-like stability. The HoloLens presented significant limitations: its narrow field of view (30 x 17.5 degrees), low-contrast translucent display, and physical weight were problematic. One participant with very limited vision could not use the system at all because the HoloLens display lacked sufficient contrast. The "freeze frame" feature — capturing a still image for reading rather than live video — proved particularly useful for reducing image instability. Color filters (white/blue, yellow/blue, grayscale, yellow/black, red/black) were valued for customization across different visual conditions.
Relevance
This research is significant because it maps out the design space for a technology category — AR magnification — that is likely to become increasingly practical as AR hardware improves. The iterative design process with low vision users produced concrete design recommendations applicable to future AR assistive devices: use optical see-through displays that augment rather than replace vision, separate the camera from the display so users can point the camera independently, provide multiple display positioning options since no single mode suits all users or situations, and include customizable image enhancement features. The highly variable responses across participants — with the same feature being essential for one person and unusable for another — underscore that low vision is not a single condition but a spectrum requiring flexible, personalizable tools. The paper honestly documents the current limitations of consumer AR hardware for this use case while articulating a compelling vision of what these tools could become when hardware catches up to the design possibilities.
Tags: low vision · augmented reality · magnification · wearable technology · head-mounted display · assistive technology · iterative design · Microsoft HoloLens