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Central nervous system oxygen toxicity manifests as symptoms such as visual changes (especially tunnel vision), ringing in the ears (tinnitus), nausea, twitching (especially of the face), irritability (personality changes, anxiety, confusion, etc.), and dizziness.entral nervous system oxygen toxicity manifests as symptoms such as visual changes (especially tunnel vision), ringing in the ears (tinnitus), nausea, twitching (especially of the face), irritability (personality changes, anxiety, confusion, etc.), and dizziness.
CNS oxygen toxicity is the main form seen in diving. Pulmonary oxygen toxicity is not of concern except in very long technical dives (extended cave or rebreather dives, for example) lasting six to 12 hours or more.Prolonged dives within the safe limits for CNS oxygen toxicity may still cause ocular toxicity, which manifests as a narrowing of the visual field and myopia.ulmonary oxygen toxicity is not of concern except in very long technical dives (extended cave or rebreather dives, for example) lasting six to 12 hours or more. Prolonged dives within the safe limits for CNS oxygen toxicity may still cause ocular toxicity, which manifests as a narrowing of the visual field and myopia.