While playing outside , not really strenuous, I got slightly dizzy and things very strangely started to white out....almost like pixels. They kept increasing in number til I could only make out forms and some background but faces and detail was pure white. It took a good 5-8 mins. to see correctly again. I am a 65yo white male, well controlled hypertension, no other significant history. I have had occasional dizziness,but no white outs ever.