Laugh your way to better eyes? trial tests fun fixes for dry eye

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * ≥18 TO ≤45 years of age, any sex. * Meet the dry eye diagnostic criteria of the DEWS international consensus, and show both of the following two conditions: OSDI score between 18 and 80; NIBUT (Non-invasive tear break-up time) \< 8 seconds * Best corrected visual acuity ≥ 0.5(10/20) (in each eye). * Intraocular pressure between 5 and 21 mmHg (in each eye). * Women of childbearing potential must agree to use safe contraception during the study. * Willingness/ability to return for all study visits and to follow instructions from the study investigator and their staff. * Voluntary participation and signing of the informed consent form approved by the Ethics Committee. Exclusion Criteria: * NEI corneal fluorescein staining score \> 5 (in either eye). * Wore contact lenses within the past 14 days and cannot commit to not wearing them during the study period (3 months) (in either eye). * Received refractive surgery (LASIK, SMILE) or other ocular surgery, or had ocular trauma within the past 12 months (in either eye). * Had acute allergic conjunctivitis, infection, or ocular surface inflammation within the past 3 months (in either eye). * Eyelid abnormalities that affect eyelid function, such as nystagmus, blepharospasm, ectropion, entropion, or severe trichiasis (in either eye). * Previously diagnosed with glaucoma and received medical or surgical treatment (in either eye). * Currently receiving other ophthalmic or systemic treatments that may affect the tear film. * Allergy to fluorescein sodium. * Have a serious health condition that may limit their ability to participate. * Pregnant, breastfeeding, or planning to become pregnant. * Diagnosed with neurological or psychiatric disorders (e.g., severe anxiety, depression, or severe sleep disorder). * Have difficulty with physical movement. * Previous experience with traditional exercise such as Baduanjin. * Previous experience with laughter exercise.