I came across an article online about modern symptoms and eyes due to smartphone use and would like to share it here. Degenerative eye disease caused by long-time smartphone use has recently been a problem. Squint caused by smartphone use has also been increasing little by little. There are various symptoms such as internal external , and vertical squints. The young generation and the elderly have a tendency to squint. In the case of squint, one eye looks to the front even though the other one looks in a different direction from the front. Because of this, it's hard to experience perspective and solidity.? The report says that squint due to smartphone use has increased since about 2016. When we read text and watch dramas with a smartphone, we have a tendency to be cross-eyed because the distance between the display and the eyes is close. On top of that, the eyes hardly move since the display is small. That can cause the muscles that move they eye laterally to stop working. (To become lazy) So, the medical specialist said we should avoid using smartphones for long periods in the same posture before sleeping. The specialist suggests that we have to keep a distance of more than 30 centimeters between our eyes and the display when we watch movies on our smartphone and our tablets. We should also take a 30 minute break when we watch movies on our smartphones and tablets . We should often exercise our eyes by looking in different directions.