Immediate Effects of Lipid-Based and Non-Lipid Artificial Tears on Corneal Aberrations

This intervention consists of a lipid-based artificial tear formulation containing mineral oil and hydroxypropyl guar. It is designed to enhance the tear film's lipid layer and improve ocular surface stability. Participants in this group will receive a single drop in each eye, and corneal aberrations will be measured at baseline and 15 minutes after instillation.

This intervention consists of a non-lipid artificial tear formulation containing hydroxypropyl guar. It is intended to stabilize the aqueous layer of the tear film and maintain optical quality. Participants in this group will receive a single drop in each eye, and corneal aberrations will be measured at baseline and 15 minutes after instillation.