in my minecraft game it is having a light glitch.Black and blue things are flashing up on my minecraft game.I cant see most anything on my screen on minecraft.This has never happened before.

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. log on to a game or server
2. ...start playing
3. ...it's there