Common questions
Short answer
That sandy, something-in-the-eye feeling usually means the surface of your eye is drying out between blinks. The grit is not debris — it is the sensation of dry patches forming on a surface that should stay evenly wet. Inflammation along the lid margin often adds to it.
Between blinks, the tear film has to hold together across the whole surface of the eye. When the oil layer is thin, it breaks apart within a few seconds and small dry spots form. The cornea is among the most densely innervated tissue in the body, so those spots register clearly — as roughness, as grit, as the feeling that something is in there.
It is also why the sensation often eases for a moment after a hard blink and then returns: the blink resurfaces the eye, and the film breaks up again.
If your lids are also red along the lash line, or crusted in the morning, blepharitis is likely in the mix. Inflammation and debris at the lid margin irritate the surface directly every time you blink, and they block the gland openings that should be releasing oil.
Debris and bacteria build into a biofilm along the lash line and the gland openings, and an overpopulation of demodex mites can come with it. A lid debridement is essentially an exfoliation of the lid margin that clears all of that away.
It is the reason a course of treatment starts there. Light and heat achieve much less on lids that have not been cleared first.
Screens, because we blink around 60% less while looking at one, and many of those blinks are incomplete. Dry indoor air through a prairie winter. Wind, fans and car vents aimed at your face. Antihistamines and some other medications. Sleeping with a fan on, or with lids that do not fully close.
If the grittiness is worse in one eye, came on suddenly, or comes with real pain or light sensitivity, that is a reason to be seen promptly rather than to read another page.
Where treatment starts
Visit one of our experienced optometrists to get started on your journey to true dry eye relief. The exam is what separates blocked oil glands from allergy, from lid margin inflammation, from everything else that produces the same symptoms — and it is what tells us whether the treatments we offer will help you.
Related questions
Whether any of this applies to your eyes specifically is a question an assessment answers in one appointment.