What is the function of precorneal tear film?

Prepare for the JCAT Independent Practice Exam! Study with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

The function of the precorneal tear film is to oxygenate the eye and provide a moist environment for the corneal epithelium. This tear film plays a crucial role in maintaining the health and functionality of the cornea, which is essential for vision. A well-hydrated cornea allows for clarity and proper light transmission, while also facilitating the metabolism of the corneal cells through the oxygen and nutrients contained in the tears. Additionally, the tear film protects the surface of the eye from environmental irritants and helps in the process of healing any micro-abrasions that may occur.

In contrast, the other choices suggest roles that do not accurately reflect the primary purposes of the tear film. For instance, reducing oxygen to the cornea would be detrimental, as the cornea relies on oxygen for cellular respiration. Increasing friction and blinking would not contribute to the cornea's health and could lead to discomfort and potential damage. Similarly, increasing waste and cell debris would have negative implications for the overall health of the eye, as a clear and clean tear film is vital for good ocular health. Thus, the correct option emphasizes the protective and nourishing aspects of the precorneal tear film.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy