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.
Since I was happy with the frame and the total cost, which handily beat the prices charged by Warby Parker and the ophthalmologistâs office, I decided on the spot to go with Costco. After being fitted and paying in advance for the glasses, I was told they would be shipped to the store in five to seven days.