what are the diferences between a blind grenade and a smoke grenade? the smoke says it affects only visuals, but the blind grenade has a damage profile, but also has the smoke property, that states that these weapons create smokescreens instead of inflicting damage.

Smoke is negated by things like Preysense. Blind is not.

Blind grenades do inflict damage and cause "Smoke", and the detail entry for Blind grenades specifies that sensors that can see through Smoke cannot see through Blind grenade Smoke.