Blinding can't be the primary objective - so make sure your laser weapons are strong enough to burn a hole in your military target's head to abide by my non lawyer reading of this.

https://en.wikipedia.org/wiki/Convention_on_Certain_Conventi...

No. You only get into trouble if your weapons are specifically designed to blind.

Eg https://en.wikipedia.org/wiki/Protocol_on_Blinding_Laser_Wea...