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.
Answers (4) 1  The average price of glasses at pearle vision is about $ 110 which is affordable to most people. 2  I don't think they are affordable at pearle vision. 3  Well, as you know, Pearle vision is a good place full of different glasses of various types and prices.  While prices vary by location.