1. After informed consent, adolescents and young adults aged 14-35 years old (including 14,35 years old) are assessed by questionnaires and dry eye related examinations.
2. The main content is Investigating the relationship among dry eye disease, problematic smartphone use, bedtime procrastination, and sleep quality.

Ocular Surface Disease Index scale with 12-item will be used to measure dry eye symptoms. The scale uses Likert 5 comments, with a total score ranging from 0 to 100. And the total score reaching or exceeding 13 points indicates that participants exhibit symptoms of dry eye.

The 10-item Smartphone Addiction Scale Short Version will be used to measure the problematic smartphone use. The scale uses Likert 6 comments, with a total score ranging from 10 to 60. And higher scores indicate more severe problematic smartphone use.

The Pittsburgh Sleep Quality Index scale is used to measure participants' sleep quality. The total score ranges from 0 to 21. Higher scores indicate lower quality of sleep.

There are 9 items in the Bedtime Procrastination Scale, which is used to measure participants' bedtime procrastination. The scale uses 5-point scale, with a total score ranging from 9 to 45. And higher scores indicate more severe procrastination before sleep.

The 14-item Chinese Perceived Stress Scale will be used to measure the perceived level of stress among adolescents and young adults. The scale uses Likert 5 comments, with a total score ranging from 0 to 56. And higher scores indicate a greater pressure that individuals feel in their daily lives.

The Ocular Keratograph 5M was utilized to measure the tear meniscus height directly beneath three points: the center of the pupil, the nasal corneal limbus, and the temporal corneal limbus. The average of these three measurements was calculated to serve as the final data for tear meniscus height.