What is Eye Stroke? Anterior Ischemic Optic Neuropathy (AION) occurs when there is insufficient blood supply to the optic nerve, resulting in loss of vision. There are two types of AION: Nonarteritic Anterior Ischemic Optic Neuropathy (NAION) and Arteritic Anterior Ischemic Optic Neuropathy (AAION).
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EVAP Canister Purge Valve. When energized, the evaporative canister purge valve allows the fuel vapor to flow from the EVAP canister to the engine. The normally closed valve is pulse width modulated by the PCM in order to precisely control the vapor flow.VAP Vent Valve. The evaporative canister vent valve not only allows the fresh outside air to the EVAP canister during the purge modes, but also allows the diagnostic to pull a vacuum on the fuel tank by closing the vent valve.