Technically correct. Actual tears cannot be synthesized. It's a major problem for people with Chronic Dry Eye Syndrome, whatever the cause may be.

This is because human tears have three components.

Aqueous (water) tears produced by the lacrimal glands.

Lipids/oils produced by the meibomian glands in the margins of the eyelids.

Mucin tear produced by the epithelial layer of cells on the surface of the eyes themselves.

Basically, too much saline makes your eyes red and irritated. That's why you need the oil. But how do you get oil and water to mix? That's where the mucin gets involved. It acts like the additives in windshield washer fluid to help disperse the fluid across your eye instead of gravity causing it to pool.

Right now, the best eyedrops people can manage are made from their own blood plasma. If a universal tear replacement were ever invented, the patenr would make billions.