There are a number of game effects which give an ability to do a 30' Intimidate vs all opponents. Savage Maw (2nd level spell), Blistering Invective (2nd level spell), Dazzling Display (2nd feat in a chain), Killing Flourish (4th level Slayer only feat), probably at least one other that I vaguely recall... Interestingly, almost all of these options come online around 4th level. (technically DD could be first level with a human, but would otherwise be 3rd or 5th).
The Eyepatch of Infamy is a 10,000 gp item taking up the eye slot that gives a +5 competence to Intimidate for producing capital and coercing aid. That's at most 2,500, and likely less as it does not include Intimidate for Demoralization. It also doubles the change in disposition for coerced aid - no idea what that might be valued at.
Finally, it allows the wearer (half-orc or DC 25 UMD check every hour) to use the Intimidate skill from 30' further away. Does this ability interact at all with the aforementioned effects that all give a 30' range to the demoralization? There was single post on this topic in 2016, with only two posts including the OP.
It seems a bit overpowered to allow it to extend the range, especially with how easy it is to get the Intimidate skill up... but at the same time, without significant feat investment shaken usually isn't terrible (aside from psychic magic casters) and 10,000 is a lot for what the item gives if it doesn't - single action-single target shaken from 60' away, well within charge distance of most enemies and definitely within range of casters/archers.
Diego, every one of those abilities specifically gives the ability to make an Intimidate check to demoralize all enemies within 30'. Not explicitly called out as a range or an area of effect. The Eyepatch says you can use Intimidate from 30' further away. The normal rules for Intimidate are single target within 30'. I know range and area of effect are different; what I am asking is whether the increase to Intimidate range extends the range of those abilities.
IE: Do the listed game mechanics (feats and spells) allow an Intimidate check vs all enemies within X'- in which case the eyepatch applies - OR do they take all enemies within X' and allow you to intimidate them (Eyepatch does not apply as the subset of available enemies has already been set)? Order of operations, really.
It seems like the eye patch is designed to function with, and add to, the range of even your mass intimidation checks. You spend 10k on an eye patch, you get to dazzling display intimidate everyone in 60'. Getting dazzling display as a standard action, or intimidate as a move action could make this really neat. The barbarian horrifying howl or whatever it is called, also comes to mind.