Build a photorealistic human eye that lives in the browser (single HTML page, WebGL/canvas, no external assets or models). Procedural iris with fibres, crypts, collarette and limbal ring, wet cornea with refraction and reflections, skin pores and lashes. It blinks, saccades and the pupil reacts to light; click for a new iris; sliders for iris color, skin tone and pupil size. 60 fps. It should look unreal the moment it loads.