I have a A4-TECH OP-620 optical mouse. I was noticing since few days that the red light is comming out of the move from right side and up. And today i noticed that the plastic like glass thing protecting the light from comming out was broken from the right side. A very tiny piece was broken. And can't see any thing from upside but DOTTED light is comming out from there. So is that light harmful in anyway? or shall i try sealing it ? like through sticking a tape or something?