Steve Jobs originally unveiled Keynote, Apple's presentation software (now costs Â£79 in the iWork bundle with its page layout program Pages and spreadsheet Numbers) back in January 2003, after beta-testing it in secret in public for a year.
Flashes (medical symptom): Flashes are visual effects where a person sees sudden flashes of light. (For flashes of warm feelings see hot flashes.) Some of the effects are like flashing lights, an arc of light, or the feeling like a light-bulb has just flashed on and off in the periphery of vision.
One possible cause for sudden bright white light in your vision could be the retina in your eye could be coming unattached. you MUST see an opthalmologist and get it looked at if it continues persistantly. This is not a good thing but it can be fixed if you act quickly.