Basal tears are the continuous, small amounts of fluid produced by the lacrimal glands in the eyes. Their primary function is to keep the cornea moist and nourished, providing essential nutrients and maintaining clear vision. These tears also help to protect the eyes from dust and debris. Unlike reflex tears, which are triggered by irritants or emotions, basal tears are always present. They help to form a protective film over the eye's surface, ensuring comfort and preventing dryness. This constant lubrication is vital for overall eye health and function.