The Ocular HUD is an Equipment item in Risk of Rain 2.
Activating the item makes every hit a critical for 8 seconds, meaning damage is essentially doubled, and all "on-crit" items proc. Currently, Harvester's Scythe and Predatory Instinct are the only items that benefit from it.
However, if the user already has a high critical hit change, this item won't increase damage by as much. A hit can only crit once, and any changes beyond 100% are wasted. Activating this item multiple times is also futile.
The cooldown is 60 seconds.