Which type of tear helps maintain a stable tear film on the eyes?

Basal tears are the correct answer because they continuously lubricate and nourish the surface of the eye, maintaining a stable tear film. This layer of tears is essential for protecting the cornea, providing moisture, and aiding in the healing process. Unlike reflex tears, which are produced in response to irritants or environmental factors, or emotional tears, which are associated with feelings and stress, basal tears serve the fundamental role of keeping the eyes comfortable and functioning properly throughout the day. Additionally, basal tears contain various components such as enzymes, proteins, and electrolytes that contribute to the overall health of the ocular surface.