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.
I recently purchased three pairs of progressive lense glasses. They arrived in 18 days and were excellent quality lenses and the frames fit well with little or no need for adjustment. The cost for the frames were under $25 and when adding the 1.61 high index lenses plus anti-reflective coating totaled less than $75 each. I paid $400 four years ago for a designer frame of similar quality at a retail storefront.