I guess you can answer this yourself.
The Solar Staff (Ranged)
Each time an enemy INFANTRY unit is hit by this weapon in the Shooting phase, roll a D6; on a 4+ the enemy unit is blinded until the end of the turn - it cannot fire Overwatch and your opponent must subtract 1 from any hit rolls made for the unit. The Solar Staff replaces the bearer's staff of light.
For the Greater Good: When an enemy unit declares a charge, a unit with this ability that is within 6" of one of the charging unit's targets may fire Overwatch as if they were also targeted. A unit that does so cannot fire Overwatch again in this turn.