The brown light reflection in the anterior chamber of the ocular lens, which is considered to be “mercury lensitis” caused by mercury deposition, can persist after the symptoms of poisoning disappear or after removal from mercury exposure, and is another marker of mercury absorption and a diagnosis of chronic mercury poisoning. What are the prevention methods for brown light reflection in the anterior chamber of the eye lens? I. Prevention Mercury poisoning can be treated with drugs such as sodium dimercaptopropionate or sodium dimercaptosuccinate, and mild chronic mercury poisoning can be cured, so patients do not need to have a lot of ideological concerns. In terms of prevention, comprehensive preventive measures should be adopted, replacing mercury with non-toxic or low-toxic raw materials, such as replacing mercury meters with electronic meters, replacing metal mercury thermometers with alcohol thermometers, and having exhaust hoods or airtight devices to avoid mercury vapor escaping when smelting or filling mercury. Remove and recycle the mercury left on the table, ground and wall in time. Regularly measure the concentration of mercury in the workshop air. Workers working with mercury should be physically examined once a year to detect mercury absorption and early mercury poisoning patients in time for early treatment, and mercury-containing waste gas, waste water and waste residue should be discharged after treatment. The treatment when mercury leaks in the home is: if there is still liquid, sulfur powder should be sprinkled on it to let it react; if it has evaporated, pay attention to indoor ventilation and do not touch the mercury directly with your hands, as mercury can make skin allergy. Metallic mercury adheres to the surface of objects for a long time and evaporates continuously at room temperature. Therefore the surface of the walls, floor and operating table of the mercury operation workshop should be smooth and free of cracks, so that it is easy to clean and remove the poison. The temperature of the workshop should not exceed 15～16℃. The maximum allowable concentration of mercury in the air of the workshop is 0.001mg/m3. First aid treatment 1, oral mercury poisoning, should be early with sodium bicarbonate solution or warm water to wash the stomach to induce vomiting, and then oral milk, egg white or soy milk to adsorb the poison, it should be noted that do not use salt water, otherwise, there is the possibility of increasing the absorption of mercury. 2, inhalation of mercury poisoning, should immediately evacuate the scene, change to fresh air, good ventilation, the conditions should also give oxygen inhalation. 3.People who have difficulty swallowing should fast and take oral liquid mixed with three substances: mung bean soup, soy milk water and sesame oil. Pay attention to oral care, for convulsions and coma, foreign bodies in the mouth should be removed in time to keep the respiratory tract unobstructed. 4.After the mercury enters the body from the wound, the use of mercury bromine red solution should be stopped immediately. Care 1. Close observation: The clinical manifestations of mercury poisoning patients are different, so we should monitor all kinds of clinical manifestations of patients by visualizing, touching, asking, listening and smelling. Visual: whether tremor or ataxia, observe whether the patient’s face is red, whether the skin is spotted, whether the gums are red and swollen, atrophy, gray-black mercury lines, whether there is erosion, bleeding, loose teeth, whether the patient’s performance is depressed, timid, shy, etc. Change in breathing pattern, is there any shortness of breath or too fast or too slow breathing. Touch: It is to touch the patient’s skin for roughness, touch the patient’s pulse to understand the pulse rate and strength, and touch the temperature of the limbs. Listen: to hear whether the patient speaks with anger or shyness, to hear whether the breathing is even and smooth, whether there is snoring, phlegm sound, and whether there is hoarseness, etc. Ask: Ask if the patient has dizziness, weakness, fever, salivation, sore gums, chest tightness, chest pain, abdominal pain, diarrhea, and whether there is any change in personality, emotional instability, impatience, irritability, nightmares, and disordered thinking. Smell: whether with fishy odor. 2. Mercury repellent treatment and symptomatic care: Mercury repellent treatment with dimercaptopropanol and sodium dimercaptopropanesulfonate, respectively. After one course of treatment, the patients successively showed signs of emotional agitation, multilingualism, babbling, answering unintended questions, restlessness, crying and laughing, hallucinations, etc. The more serious 4 cases also had destructive and aggressive behaviors, and the symptoms gradually decreased after the third course of mercury expulsion treatment, while anti-infective, diuretic, sedative and supportive treatments were given, and intravenous access was established to ensure smooth infusion. At the same time, closely observe the changes in the condition and urine, and take the initiative to communicate with patients who are emotionally unstable and irritable, in addition to sedation treatment. 3.Strengthen respiratory management and keep respiratory ventilation: 4 patients with chest tightness, chest pain, dyspnea and cyanosis were given continuous medium-flow oxygen, semi-sitting position with head tilted to one side to facilitate coughing out of phlegm, and were given diligent turning and back tapping to improve the state of hypoxia and keep the respiratory tract unobstructed. 4.Prevent mercury reabsorption: Because mercury is easily adsorbed by clothes, it often forms a second source of mercury with continuous contamination, so instruct the patient to wash the whole body clothes worn at work and help or assist in bathing to keep the skin clean and change clothes regularly to avoid skin reabsorption. Ventilate the ward regularly, maintain the corresponding temperature and humidity, and use items for exclusive use to prevent cross-infection. 5. Dietary care: Ask patients to drink more milk, soy milk and mung bean porridge to combine mercury with protein and protect the mucous membrane of the stomach wall which may be corroded, so as to facilitate the elimination of mercury and achieve the effects of detoxification, liver protection, kidney protection and protection of gastric mucosa. 6.Psychological care and health propaganda: hold a work-release forum to establish good nurse-patient relationship, psychological care and health propaganda to patients, nurses take the initiative to contact patients, amiable attitude, kind language, patiently listen to patients’ confessions, respect patients’ opinions, make them feel warm and gain trust, and through joint study of relevant information, make them understand the condition, so that they can actively cooperate with treatment and care. Through the conversation to understand the patient’s psychological condition, further care and consideration for patients with emotional irritability and behavioral changes, patiently answer their questions, and avoid some adverse consequences such as impatience and irritability through the communication of ideas and emotions.