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I sometimes blink hard when I wake up. When I do, I often see a single flash of white, which is more or less in the shape of a little jellyfish or a firework. It happens only one time. I can't replicate it by blinking hard again. I was recently diagnosed with the beginnings of a cataract in my left eye. I'm 65, good health, and no blood pressure issues. My cataract is not ready for surgery yet. Is there a connection with the cataract?
No, there is no connection to the cataract. Blinking hard can cause an entopic phenomenon (visual effect coming from within the eye itself). This can move the vitreous (jelly-like substance that fills the middle of the eye) around, which in turn can stimulate the retina into producing a false flash of light. This is nothing to be concerned about unless you develop many floaters and see continued spontaneous flashes of light.
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