The droplet doesn't have to be dead centre. Basically you stare past the droplet and see the glint of light in it as a big blurry orb of light. That's the "spotlight", basically.. That's it. If you squint your eyes, and see relatively sharp shadows of your eyelashes impinging on the orb, it's working.
Heh... my myopia is so severe that I get the effect just by taking off my glasses and looking at a point light source.
Christmas trees look like psychedelic, technicolor schools of puffer fish, and I can clearly watch the intra-ocular "weather" as I move my head/eyes around.
