"Beneficial for the eyes" is a phrase that can be used to describe something that is good for the health and functioning of the eyes. Here are some example sentences in Engpsh and their translations in Chinese:

"Eating leafy greens, such as spinach and kale, is beneficial for the eyes." (吃菠菜、甘蓝之类的叶菜对眼睛有益。)
"Wearing sunglasses on sunny days can protect your eyes and be beneficial for their health." (在阳光充足的日子戴太阳镜可以保护眼睛,并有益于它们的健康。)
"Getting enough sleep each night is beneficial for the eyes and can help prevent eye strain." (每晚充足的睡眠对眼睛有益,并可以帮助预防眼疲劳。)

The phrase "beneficial for the eyes" comes from the idea that certain activities or substances can have a positive effect on the health and functioning of the eyes. For example, certain nutrients, such as vitamins A, C, and E, are known to be important for maintaining healthy eyes. Similarly, getting enough sleep and protecting the eyes from the sun's harmful UV rays can also be beneficial for the eyes.