Feeling like there's something in your eye (a "foreign body sensation") usually means the surface of your eye is irritated, even if nothing is actually visible there. Common causes include:
Actual foreign material
- Dust, an eyelash, sand, or a small debris particle stuck under the eyelid or on the eye's surface.
- Makeup flakes, contact lens debris, or pollen.
Dryness
- Dry eye syndrome is one of the most common causes of this sensation. When tear production or quality is reduced, the eye surface isn't lubricated properly, and blinking can feel gritty or scratchy, mimicking a foreign object.
Irritation or inflammation
- Conjunctivitis ("pink eye"), whether viral, bacterial, or allergic, often causes a gritty feeling along with redness, tearing, or discharge.
- Blepharitis (inflammation of the eyelid margins) can also produce this sensation.
Corneal issues
- A scratch or abrasion on the cornea (often from rubbing the eye, contact lens misuse, or minor trauma) can cause a persistent sensation that something is lodged there.
- A corneal ulcer or infection, more serious, can feel similar but usually comes with pain, light sensitivity, and blurred vision.
Contact lens problems
- Lenses that are dirty, torn, or worn too long can create this feeling.
Eyelid issues
- An ingrown eyelash, a stye, or a chalazion (a small bump on the eyelid) can rub against the eye's surface.
When to see a doctor
- If the sensation persists more than a day, worsens, is accompanied by pain, redness, discharge, light sensitivity, or vision changes, or if you can't flush out a visible object, seek an eye care professional. Untreated corneal scratches or infections can lead to complications.
For mild, brief irritation, blinking, flushing with saline or clean water, and avoiding rubbing the eye are reasonable first steps.