One eye is nearsighted and the other is not, which may be related to incorrect eye use or due to individual developmental abnormalities and other reasons. 1. Incorrect eye use: If you often lie down to look at the cell phone, tilt your head to look at things, write with your head tilted, etc., due to the long-term existence of incorrect eye habits, such as tilting your head when the ciliary muscle of one eye is over-adjusted, while the other eye is in a state of relaxation, it will be easy to appear in one eye nearsightedness and one eye not nearsightedness, especially in adolescents and children is more common. 2. Individual developmental abnormality: usually related to genetic factors, if one or both parents have high myopia, it will easily lead to myopia of the offspring under the influence of genetic factors, in the process of myopia, due to the different ability of the two eyes to receive visual signals, there may be a myopia in one eye and not myopia in the other eye. It is recommended that patients with myopia in one eye should consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.