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.
Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen (O 2) at elevated partial pressures. 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. Central nervous system oxygen toxicity: High oxygen levels which affects the central nervous system. The condition can occur during deep dives with fatal consequences. More detailed information about the symptoms, causes, and treatments of Central nervous system oxygen toxicity is available below.  There are two main types of oxygen toxicity: central nervous system (CNS) oxygen toxicity and pulmonary oxygen toxicity. CNS oxygen toxicity is usually caused by divers exposing themselves to an oxygen partial pressure of 1.6 ata or greater, and can result in convulsions, pulmonary barotrauma, and death. Pulmonary oxygen toxicity is caused by divers exposing themselves to elevated partial pressures of oxygen for long periods of time, and is primarily a concern for technical divers who decompress on oxygen. Oxygen toxicity is a medical condition caused by exposure to oxygen at high pressure. Oxygen toxicity is a concern for scuba divers who dive beyond recreational depth limits, use mixed gasses such as enriched air nitrox, or use gasses with high partial pressures of oxygen for decompression stops. Pulmonary oxygen toxicity is caused by divers exposing themselves to elevated partial pressures of oxygen for long periods of time, and is primarily a concern for technical divers who decompress on oxygen. The central nervous system (CNS) is the part of the nervous system consisting of the brain and spinal cord.  About signs and symptoms of Central nervous system oxygen toxicity: The symptom information on this page attempts to provide a list of some possible signs and symptoms of Central nervous system oxygen toxicity. Furthermore, signs and symptoms of Central nervous system oxygen toxicity may vary on an individual basis for each patient. Only your doctor can provide adequate diagnosis of any signs or symptoms and whether they are indeed Central nervous system oxygen toxicity symptoms. 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. Severe cases can result in cell damage and death, with effects most often seen in the central nervous system, lungs and eyes. Oxygen toxicity is a concern for underwater divers, those on high concentrations of supplemental oxygen (particularly premature babies), and those undergoing hyperbaric oxygen therapy. The result of breathing elevated partial pressures of oxygen is hyperoxia, an excess of oxygen in body tissues. 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. 0. Oxygen physiology for divers has been one of the most misunderstood subjects in the sport for some time. Case in point: For years, the oxygen percentage in atmospheric air was commonly taught in scuba classes to be 20 percent when it actually is 20.98 percent, rightfully rounded to 21. The hazards of CNS oxygen toxicity are easily avoided by ensuring that your dive profiles don't violate the NOAA limits. Set your PO2 at 1.6 (less for longer dives), watch your computer's display of dose accumulation, and do not exceed the maximum depth limit for your nitrox mix.
https://en.wikipedia.org/wiki/Oxygen_toxicity http://www.rightdiagnosis.com/c/central_nervous_system_oxygen_toxicity/intro.htm http://scuba.about.com/od/scubaterminology/f/What-Is-Oxygen-Toxicity.htm http://scuba.about.com/od/scubaterminology/f/What-Is-Oxygen-Toxicity.htm https://en.wikipedia.org/wiki/Central_nervous_system http://www.rightdiagnosis.com/c/central_nervous_system_oxygen_toxicity/symptoms.htm http://www.alertdiver.com/Oxygen_Toxicity https://en.wikipedia.org/wiki/Oxygen_toxicity http://www.scubadiving.com/training/basic-skills/instruction-cns-oxygen-toxicity
what is cns toxicity