Lettuce is a vegetable, is a kind of food, will not be like some drugs, can be directly to the eyes to produce medicinal effects, and will not have some side effects of drugs and affect the eyes, its main role is to contain some nutrients, can be for the body to increase the relevant nutrients. However, it is not recommended to eat more, too much will increase the burden of gastrointestinal digestion, may easily cause gastrointestinal discomfort. Fresh lettuce more than 90% for water, the rest for a small amount of plant protein, some carbohydrates and plant fiber and other components, but also contains a variety of vitamin components, such as 100 grams of lettuce containing vitamin C is about 4.0 mg, niacin is 0.5 mg, riboflavin and thiamin were 0.02 mg. Reasonable intake of vitamins and other nutrient-rich foods in the daily diet is beneficial to the normal operation of the body’s physiological functions, so the main role of eating lettuce is to increase the nutrition, which is beneficial to the maintenance of the body’s physiological functions, and there are no other special effects. It is recommended that patients with ocular discomfort should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment to avoid delaying their condition.