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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When a central air conditioner freezes up, what actually freezes is the condensor unit's evaporator coil. This is the part of the air conditioning system that transfers (evaporates) heat from the inside to the outside of the home. There are two primary reasons the evaporator coil may freeze, it can either be due to 1) restricted air flow, or 2) lack of sufficient refrigerant. Either way, the result is that the air conditioner's evaporator coil cannot operate to properly dissipate heat, and in effect 'overcools' itself.