Eye Pain

The goal of this clinical trial is to understand what effect a cold treatment with an investigational device, ETX-4143, has on the anatomical structures and the inflammatory response of the surface of the eye in those people who suffer from chronic ocular surface pain (COSP). The trial will also tell us more about the safety of this investigational device. The main questions this study aims to answer are: * What anatomical changes happen to corneal surface nerves after treatment with ETX-4143 * What changes in inflammatory mediators and cell response take place after treatment with ETX-4143 Researchers will obtain images of the corneal surface nerves for analysis using a confocal microscope and collect tear bio samples for analysis. Participants will: * Be screened for having chronic ocular surface pain * Will be treated with ETX-4143 cold treatment for 4 minutes * Fill out a weekly questionnaire on eye pain for 12 weeks * Be seen in the clinic 2 weeks, 6 weeks, and 12 weeks after treatment to have images of the corneal surface taken, and to collect a tear bio sample

The goal of this clinical trial is to compare the administration of 2 drugs, cyclosporine 0.05% (Restasis) and Lifitgrast (Xiidra) before PRK, in reducing the ocular surface symptom of patients after PRK. The main questions it aims to answer are: 1- Does the use of cyclosporine 0.05% (Restasis) and Lifitgrast (Xiidra) before photorefractive keratectomy surgery (PRK) reduce ocular surface symptom such as eye pain, redness, and inflammation in conjunctivitis in patients? Researchers will compare cyclosporine 0.05% (Restasis) and Lifitgrast (Xiidra) to a placebo (Artelac artificial tears) to see if cyclosporine 0.05% and Lifitgrast works to reduce ocular surface symptom. Participants will: Take drug cyclosporine 0.05% and Lifitgrast or a Artelac 30 minutes before surgery Visit the clinic 6 hours, one day, three days and one week after photorefractive keratectomy (PRK) for checkups and tests