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.
For example, if the regular retail price is $250, you will have to pay $126 toward the cost of your contact lenses. ($250 Â­ $70 = $180; 70% of $1 80 = $126.) Optional Services Additional services are available to you through participating providers at the costs indicated: Â· Photosensitive single-vision lenses - $7.50. Lens or lenses, including: - single-vision bifocals, trifocals or lenticular lenses; - glass or plastic lenses; and-tinting of lenses. Â· A frame from a selection of discounted frames, which may vary from location to location.