The correct spark plug and gap is crucial to proper ignition. Spark discharge is a breakdown in the air insulator between the electrode and ground. Yes - air is an insulator, a pretty good one at that. As voltage builds at the electrode, atoms in the air within the air gap gain electrons. This process is called ionization.
It's one of the reasons why our standard lenses are polycarbonate (thinner than standard lenses typically sold by other eyeglasses retailers). At Warby Parker, you can upgrade to high index lenses for an additional $30 whereas it typically costs $60 to $100 more.
from my understanding, Warby Parker is mainly a cheaper substitute for many of the designer glasses out there that cost way more than glasses ever really should, quality wise (design is subjective so I won't comment on that). the frames might be more expensive than say lenscrafters but they're decent quality around the level of Ray Bans as some have suggested. many say their lenses are bad though so I might buy just the frame and get lenses elsewhere.