The brown light reflection in the anterior chamber of the ocular lens is thought to be a mercury lensitis caused by mercury deposition, which persists after the symptoms of toxicity disappear or after exposure to mercury is removed, and is another marker of mercury absorption. How to effectively prevent brown light reflection in the anterior chamber of the eye lens? 1, the main and most important measure for the prevention of brown color in the anterior chamber of the eye lens is to pay attention to the management of metallic mercury products, do not have too much or contact with mercury products in life, pay attention to disinfection, hygiene and safety management in industrial operation workshops, establish a strict management system, and do not allow too much contact with metallic mercury or mercury products. 2, in the usual diet should also eat more beneficial food for the eyes, moderate intake of food rich in vitamin A, C, E and fiber, avoid drinking too much alcohol, eat less salty and hot food, eat less burnt food, do not eat moldy food, avoid excessive sunlight, avoid overwork, maintain personal cleanliness and hygiene. Strengthen eye hygiene, do not rub your eyes, do not use unclean handkerchiefs or towels to wipe or wash your eyes, and sedentary workers should get up for 10 to 15 minutes at intervals of 1 to 2 hours, raise their eyes and look far away, or do eye exercises. Have enough sleep to recover from fatigue in time. For people over 40 years old, it is best to use bifocal lenses, or wear glasses with a lower degree; when typing. Work posture and distance is also important, try to keep on 60cm to distance, adjust a most appropriate posture, so that the line of sight can be maintained down about 30o, such an angle can make the strength of the muscle; meat relaxation, and make the surface of the eye exposed to the air to minimize the area. 3, usually the main protection of the eyes, take effective measures, pay attention to eye hygiene, and do more sports and outdoor exercise. Pay attention to rest, don’t overuse your eyes, don’t get tired and stay up late on a regular basis. 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 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 permissible concentration of mercury in the air of the workshop is 0.001mg/m3. Avoid mercury poisoning, once the eyes have abnormalities, immediately go to the hospital for medical treatment.