How to replicate optical flares?

Does anyone have any ideas as to how I would go about replicating optical flares (the medic ability from starcraft). I tried setting acquisition range to 0 via triggers but it didnt work (i may not have triggered it properly though). If you didnt know this is what optical flares does:

The sole defensive armament of the Medic is the A-13 Flash Grenade Launcher. Originally designed as a way to provide illumination to the battlefield, both the delivery system and the projectile have been modified to discharge a maximum burst in the visible white light as well as ultra-violet spectrum. This has the side effect of severely damaging the retinas or photo-optic receptors of any targeted unit.

The sight range of the targeted unit is permanently reduced to 1 matrix, unless the condition is Restored by a Medic. This also removes any detection ability that unit may possess. The affected unit will display a 'Blinded' tag in its information box when selected.

Often dismissed as being "silly", Optic Flare does have its uses. Optic Flare reduces the sight range to 1 but it doesn't prevent the unit from firing on anything normally within range if it can be seen. If another unit is around to spot for the Blinded unit, the Blinded unit can still attack normally. Therefore, to get the full effect of Optic Flare you must Blind all of the units in a given area, or a single unit while it's off on its own.

I dont need it to be dispellable btw.

There might be a trigger (maybe advanced) that allows you to modify the unit's sight range. You could activate it using a simple "unit has specific buff" event.