3D Selection Vault

GazeScope

Also known as Gaze magnifier

A hands-free magnifier for gaze selection: glancing at a spot 25° away from where the head points opens a magnifying lens fixed to the head; the user turns the head to bring a small target into the lens and dwells on its magnified image to select it.

How it works

Looking at a 5°-radius area 25° from the head direction (below and to the side) for 400 ms opens the magnifier; people rarely fixate that far from the head, so it is not triggered by accident. The lens, 4× magnification at 1 m, stays fixed to the head, so head rotation moves it over the target, and a 600 ms dwell on the target inside the lens selects it; objects outside the lens cannot be selected. A fisheye lens with a linear centre was compared with a plain linear lens, each placed straight ahead or where the activation glance ended. With 24 participants on an HTC Vive XR Elite selecting 1–3° targets among 100 objects, the fisheye lens straight ahead was best: 1.12% errors and 3.73 s total selection time, against 2.31% and 4.03 s for the linear lens straight ahead and about 5% errors for lenses at the glance position.

Papers