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.
DuraClear â¢ coating is available for any prescription lens you choose, but it is especially recommended for higher-index lenses as they reflect more light without the coating. Anti-reflective coating is an add-on to your lens order and costs $55 for the standard coating and $99 for the premium coating.