Hello Mr. Lilian
Flashes and floaters of light usually indicate opacities in the posterior part of the eye or problems in the peripheral part of the retina
like small holes or tears in the retina or thinning of the retina. You need to worry if you these symptoms following injury
or you are wearing glasses for high refractive error
Sudden onset of these symptoms may be seen in acute cases indicating retinal pathologies which are of concern.
You need to undergo a simple eye examination called as indirect ophthalmoscopy
after dilatation of the pupils preferably by a retinal specialist