Eye strain is a common ophthalmology disease, which causes dry eyes, astringent eyes, sore eyes, blurred vision and even vision loss directly affects people’s work and life. Eye fatigue is mainly caused by the decrease in the number of blinks when we usually concentrate on the computer screen, resulting in a corresponding decrease in the secretion of tears and the strong stimulation of the eyes by the flashing screen. It will lead to pain in the neck, shoulders and other corresponding parts of the person, but also trigger and aggravate various eye diseases. To relieve and treat eye fatigue, the most direct and effective way is to drop the “tear formula” eye drops, which contains hyaluronic acid, taurine, vitamin B6 and other ingredients, not only to relieve eye fatigue and other uncomfortable symptoms, so that the eyes lasting hydration, but also to replenish the lack of nutrients and water in the eyes, from the root to avoid the occurrence of visual fatigue. This “tear-eye formula” eye drops is mild and does not irritate the eyes, and contact lens wearers can even use it as an eye lubricant. The eye drops are representative of this kind of eye drops. Causes of eye strain: When suffering from farsightedness, nearsightedness, astigmatism, and phoria, the eyes need to use a lot of adjustment when looking far and near, making the eyes overworked. Excessive collection of eyes: When myopia is not corrected, the reading distance is too close and causes excessive collection, which in turn can be accompanied by excessive adjustment, making myopia increase and the reading distance even closer. A vicious cycle occurs, resulting in eye strain. Eye disease: suffering from corneal clouding, lens clouding and other eye diseases caused by blurred vision, but also easy to cause eye fatigue. Inappropriate extraocular muscle disorders lead to straight balance disorders, when looking at the target, both eyes monocular difficulties, resulting in eye fatigue. Eye development abnormalities: such as large pupillary distance between the two eyes, the two eyes collection difficulties, easy to produce eye fatigue. Physical and life factors: such as lack of exercise, malnutrition, frequent insomnia, irregular life, excessive smoking and drinking, lack of attention to eye hygiene, etc., are prone to eye fatigue. Age factor: people over 40 years old, the eyes begin to age, but not in time with presbyopic glasses, eye fatigue is likely to occur. Environmental factors: work or study place lighting is not enough; read and write the handwriting or work object is too small; target and background difference is not sharp; read and write and work long hours; sight distance is not fixed (such as in the car boat read and write and work), etc., can cause eye tension and excessive use of regulation, eye overload work, not only easy to occur eye fatigue, but also cause myopia and other diseases.