 [ Symptoms ] i accidently burnt my aluminium pot containing h20 on gas i clean it but it has a purple shine is it safe to use now i forgot to switch off the gas stove on which i left water boiling in an aliminium or steel potnot sure of wch metal it exactly is pot for 30 35 minutes and when i entered kitchen it was full of smoke i cleaned the pot and black spots got removed but there is slight purple shine at the bottom is it safe to use that burnt pot now for cookingboiling etc [ Disease ] it would not be possible to specifically address your question as to why your vision has deteriorated over the internet we do not know anything about you your medical history your age or have any way of examining you so you will need to see an eye care professional such as an ophthalmologist