Instructions: First click on a few locations within the screen while looking purposefully at the cursor. (Both clicks and cursor movements make the predictions more accurate.) Then move your eyes around the screen; if well calibrated, the atoms you look at should come to the front. Keep calibrating if you, the screen or light sources move or change.

This app displays a structure of ubiquitin (PDB ID 1UBQ, colored by amino acid type) with JSmol and controls it through webcam-based eye tracking with WebGazer (modified slightly by Angel Herraez for compatibility).