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.
How Much Do Contact Lenses Cost â Prices. Ballpark Estimate: $150 to $400 for a yearâs supply. If you have less than perfect vision and donât want the inconvenience of wearing glasses, you may want to consider the latest crop of contact lenses that are available.