Which of the following is a function of the lacrimal system?

• A. Produces vitreous humor.
• B. Provides a smooth, optically clear cornea surface.
• C. Regulates pupil size.
• D. Transmits neural signals to the brain.

Answer: (B)

Maintaining a healthy tear film is essential for a smooth, optically clear surface on the cornea. The lacrimal system secretes tears and coordinates their spread across the eye with blinking, lubricating the corneal epithelium and providing a moist, uniform refractive surface. This helps minimize surface irregularities that can scatter light and blur vision, which is why providing a smooth, optically clear cornea surface is the function associated with the lacrimal system.

Producing vitreous humor comes from the vitreous body inside the eye, not the lacrimal glands. Regulating pupil size is controlled by the iris and autonomic nerves, not tear production. Transmitting neural signals to the brain is done by neural pathways involving the retina and optic nerve, not the tear system.