How come i get floaters when looking at the sky?

It's common: Floaters can be seen when looking at a light uniform background, like the sky or snow. The gel present in our from birth, commonly develops little opacities that are suspended and move around with eye movements. When light enters the eye and one is looking at a blank background, shadows of these opacities are seen as floaters. Gradual onset in both eyes is benign. Sudden onset in 1 eye may not be.

Vitreous detachment: Floaters are caused by the vitreous (jelly in the eye) detaching from the retina (typically a normal change in the aging eye). The vitreous clumps up or develops blurry areas within the jelly causing your floater. Yes they can be a warning sign. If when the vitreous changes, causing floaters, the retina is torn you are at risk for a retinal detachment. You should have and examination.