The white of the eye refers to the sclera. Gray patches on the sclera may be due to physiological and pathological reasons, such as roundworm spots and vitamin deficiency. 1. Physiological reasons: gray patches formed due to pigmentation, just like moles on the skin. Human eyeballs will also grow moles, is a relatively common physiological phenomenon, generally do not need to be treated. 2. Pathologic causes: (1) Ascaris lumbricoides spots: when swallowing unclean food with Ascaris lumbricoides eggs sticking to it, resulting in Ascaris lumbricoides infection, gray dot-like patches will appear on the sclera. (2) Vitamin deficiency: When the body is deficient in vitamin A, vitamin D and B vitamins due to picky eating or improper dietary structure, etc., there may be a decrease in the function of the retinal optic cone optic rod cells, resulting in the appearance of gray pigmented patches in the sclera. When there are gray patches on the sclera, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment.