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.
Choose any frame up to $149 with your choice of lenses: FeatherWates Single Vision for $299 or Multi Focal FeatherWates lenses for $349. See associate for additional lens prices. Some brands excluded including Varilux lenses, Oakley sun frames and Authentics lenses, Cartier frames and Ray-Ban Chromance Authentic lens and frames. Valid on multiple pairs. Cannot be combined with any vision benefits, any other offer or discount, previous purchases, readers or nonprescription sunglasses.