In Maine, vision testing is required at the first renewal after driver's 40th birthday, then at every second renewal until age 62, and thereafter at every renewal. In Oregon, vision testing is required every 8 years for drivers 50 and older. In Illinois and New Hampshire, applicants 75 and older must take a road test.
Bottom line: When charged particles from the sun strike atoms in Earthâs atmosphere, they cause electrons in the atoms to move to a higher-energy state. When the electrons drop back to a lower energy state, they release a photon: light. This process creates the beautiful aurora, or northern lights.
Northern Lights Iceland best time: more details. The northern lights are a result from emission of photons in the highest altitude â more than 80km up, made by ionized nitrogen regaining an electron, and oxygen and nitrogen atoms coming from an excited level to a more grounded state.