10 wards were randomly selected as the intervention group (opaque black tape covering part of the light source).

another 10 wards were selected as the control group (no intervention)

10 wards were randomly selected as the intervention group (opaque black tape covering part of the light source), and another 10 wards were selected as the control group (no intervention).

Relapse risk was assessed by Chinese version of the Early Signs Scale (ESS). The ESS scale consists of 34 items (e.g., recently been bothered by 1 or 2 small things in life; To feel down and down; Other people don't understand me; Difficulty concentrating; It feels as if the thoughts are not my own... Etc.). Each entry is rated from 0 points (0 times/week), 1 score (1 time/week), 2 scores (more than 1 time/week) to 3 scores (at least 1 time/day), and all entries total 102 scores. The ESS scale has 4 dimensions, which are: Anxiety/agitation (ESS-A, 7 items); Depression/withdrawal (ESS - N, 10 items); Excitability/disinhibition (ESS-D, 6 items); Incipient psychosis (ESS-IP, 11 items).

The Montreal Cognitive Assessment (MoCA) is a widely used cognitive screening test designed to assess various cognitive functions, including memory, attention, language, and visuospatial abilities. It was created by Dr. Ziad Nasreddine in Montreal, Canada, in 1996, and it has since become a valuable tool for detecting mild cognitive impairment (MCI) and early signs of dementia, especially Alzheimer's disease.

The MoCA consists of a series of tasks and questions that evaluate different cognitive domains. The total score on the MoCA is 30 points, with a higher score indicating better cognitive function. A score of 26 or above is considered normal for most individuals, although the normal range can vary based on factors such as age and education level.