Four Eyes

Four Eyes is a trait

Effects

 * Taking this trait lowers the Courier's base Perception by 1 point when attempting to qualify for perks. This means the player character must have a base Perception of 7 to qualify for all Perception-based perks (except Infiltrator and Hobbler which require 8 instead of the usual 7 due to the -1). This can be achieved by raising Perception to 7 at creation, or Perception 6 with Intense Training added later to boost it to 7.
 * Wearing glasses with this trait will actually raise Perception by +2 as seen in the Pip-Boy display, thereby nullifying the -1 penalty in terms of compass and skill benefits (though not the damage to base Perception, thus requiring the player having 1 more point of permanent Perception to take an associated perk). Perception 7 at creation, with this trait (glasses equipped), Intense Training +1 or an implant and a +1 Perception headgear will still total 10 Perception.
 * In Doc Mitchell's house, there is a pair of reading glasses on the counter over his right shoulder (behind the medical bed). They can be acquired before interacting with the Vit-o-Matic Vigor Tester, though not worn until the player character receives the Pip-Boy 3000.

Behind the scenes
"Four eyes" is a common derogatory term for someone who wears spectacles.