Looking at a cell phone generally does not make your eyes smaller. Looking at a cell phone may cause visual fatigue in the eyes, but it does not usually have a direct effect on the size of the eyes. The size of the eyes is very much related to the development of the eyes, and eye size can be caused by trauma, ptosis, etc., and has nothing to do with looking at cell phones. However, looking at a cell phone for a long time at a close distance may lead to myopia, astigmatism and other refractive errors in the eyes, which may cause blurred vision, loss of vision, etc., and you may like to squint your eyes to see things. Excessive use of the eyes can also cause discomfort such as dry eyes and fatigue. After looking at the cell phone for a long time, you can look at something far away and green, which can effectively relieve visual fatigue. It is recommended to develop good eye habits, do not look at the cell phone for a long time and do not stay up late. You need to pay attention to eye cleaning and hygiene, and ensure sufficient sleep.