Strabismus is usually caused by abnormal function of extraocular muscles or abnormal monovision of both eyes. Lying down and looking at a cell phone does not affect the movement of extraocular muscles, so lying down and playing a cell phone usually does not lead to eye strabismus.
However, lying down to play the cell phone is a bad habit, especially for people who have been reading in this state for a long time, it is easy to lead to the development of myopia. If you lie on one side for a long time and play the cell phone diagonally, it is easy to cause refractive error, i.e., good vision in one eye and poor vision in the other.
For children and adolescents in the process of development, it is important to maintain a correct reading posture, reduce the use of electronic products, avoid excessive eye fatigue, and also maintain sufficient sleep.
Once strabismus occurs, prompt medical attention is recommended.