why do our eyes feel like they have sand or grit in them when we’re very tired ?
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Dryness is typically the main culprit. There are three main components to our tear film: oily layer, watery layer and the mucus layer. If there is any interruption in those layers, dryness can occur.
For example, if you don’t blink (close) your eyes completely, the meibomian glands aren’t activated and the oily portion of the rear film is at a deficit. Less oil makes our tears evaporate quicker thus making the eye dry.
If your vision tends to fluctuate throughout the day it’s possible they are dry. Using non-preservative artificial tears or lubricating eye drops will improve the corneal surface.
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