Foreign Body Sensation in the Eye

What foreign body sensation means

The cornea, the clear dome at the front of the eye, has more nerve endings than almost any other tissue in the body. Any break or rough patch on its surface, or anything rubbing against it from the inside of the eyelid, is felt as a particle. That is why a dry patch, an inflamed eyelid or a tiny scratch can feel exactly like sand in the eye, even when nothing is there.

Doctors use "foreign body sensation" to describe the symptom. The words do not mean a foreign body has been found. A useful clue is whether the feeling started suddenly after a definite event (wind, a spark, rubbing your eye) or built up gradually.

Common causes

Something really is in the eye

Dust, sand, eyelashes, makeup, insects and wood or metal fragments are typical. The sensation is usually sudden, in one eye, with watering and blinking. Particles often lodge under the upper lid, so every blink scratches the cornea and leaves fine vertical scratches. See foreign body in the eye for first aid.

Dry eye

Dry eye is the most common cause of a gritty feeling that comes and goes in both eyes. It is typically worse:

• at the end of the day, or after reading or screen use (you blink less)
• in air-conditioned, heated or windy environments
• in people over 50, women after menopause, and contact lens wearers
• with medicines such as antihistamines, some antidepressants and isotretinoin

Paradoxically, dry eye can make the eyes water, because irritation triggers reflex tears.

Blepharitis and meibomian gland dysfunction

Blepharitis is inflammation of the eyelid margins. Flakes, crusting and oily debris irritate the eye surface. Meibomian gland dysfunction, where the oil glands in the lids block up, makes tears evaporate too fast. Both cause grittiness that is often worst on waking.

Corneal abrasion

A corneal abrasion is a scratch on the cornea from a fingernail, paper edge, makeup brush, branch or contact lens. It causes sharp pain, watering, light sensitivity and a strong feeling of something in the eye. Most heal within 24 to 72 hours.

Recurrent corneal erosion

If a scratch heals weakly, the surface layer can peel off again, typically when you open your eyes in the morning. The sudden pain and grittiness on waking can recur for months after the original injury.

Conjunctivitis

Conjunctivitis (pink eye) causes redness, discharge and a gritty or sandy feeling. Viral conjunctivitis often starts in one eye and spreads to the other. Allergic conjunctivitis itches more than it scratches.

Contact lens problems

A torn, dirty, inside-out or overworn lens causes grittiness. Sleeping in lenses and wearing them while swimming raise the risk of corneal infection.

Inflamed growths on the eye

A pinguecula or pterygium is a raised growth on the white of the eye, linked to sun and wind exposure. When it becomes inflamed it feels gritty.

Ingrown eyelashes

Eyelashes that grow inward (trichiasis) or an eyelid that turns in (entropion) rub against the cornea with every blink.

Serious causes not to miss

• Corneal ulcer or keratitis: an infected sore on the cornea. Pain, redness, light sensitivity, blurred vision and a white spot. Contact lens wearers are at highest risk. This can damage vision within a day.
• High-speed metal fragment: grinding or hammering can drive a tiny fragment into or through the eye with surprisingly little pain. An X-ray or CT scan may be needed. MRI must be avoided until metal is excluded.
• Rust ring: a metal speck left for more than a few hours leaves rust stain in the cornea that needs removing by a clinician.
• Chemical injury: alkalis such as lime, cement and drain cleaner are especially damaging.
• Herpes simplex or shingles eye infection: grittiness with a red eye and, for shingles, a rash on one side of the forehead.

Comparing the main causes

How doctors find the cause

An optometrist, urgent care or ER doctor will:

1. Check your vision in each eye.
2. Look at the eye with a bright light or a slit lamp microscope.
3. Put a drop of orange fluorescein dye in the eye. Under blue light, scratches, dry patches and ulcers glow green.
4. Flip the upper eyelid to look for particles hiding underneath.
5. Test tear production or tear film stability if dry eye is likely.

If a high-speed injury is possible, they may arrange imaging to look for a fragment inside the eye.

Foreign body sensation eye treatment

First aid for a particle

• Wash your hands. Do not rub the eye.
• Blink several times and let tears wash it out.
• Rinse with clean, lukewarm water or sterile saline, using an eye cup, a clean glass held against the eye socket, or a shower stream on your forehead.
• Pull the upper lid out and down over the lower lid to let the lashes sweep under it.
• A particle on the white of the eye or lower lid can be lifted off with the corner of a damp, clean tissue.
• Never use tweezers, cotton buds on the cornea or anything sharp.

If grittiness persists after an hour, the particle may still be there or may have left a scratch.

Treatment by cause

• Dry eye: preservative-free lubricating drops several times a day, gel at night, more blinking breaks with screens, a humidifier, and treating blepharitis. Prescription drops such as cyclosporine help persistent cases.
• Blepharitis: warm compresses for 5 to 10 minutes, gentle lid massage, then cleaning the lid margins daily.
• Corneal abrasion: antibiotic drops or ointment to prevent infection, pain relief, and no contact lenses until healed. Patching is no longer routine.
• Embedded particles and rust rings: removed by a clinician under local anesthetic drops.
• Conjunctivitis: cool compresses and lubricants for viral cases. Antibiotic drops only for bacterial cases. Antihistamine drops for allergy.
• Corneal ulcer: intensive antibiotic drops started the same day, often hourly at first.

Numbing (anesthetic) drops are used in the clinic but are never given to take home, because repeated use damages the cornea.

Preventing grit and eye injuries

• Wear safety glasses or goggles for grinding, drilling, hammering, mowing and using chemicals.
• Follow lens hygiene: never sleep or swim in lenses unless designed for it, and replace them on schedule.
• Use wraparound sunglasses in wind and sun.
• Take 20-second screen breaks every 20 minutes to blink fully.

Frequently asked questions

Why does it feel like something is in my eye but nothing is there?

The cornea's nerves cannot tell a particle from any rough spot on the surface. Dry eye, blepharitis, a healing scratch, conjunctivitis or an inflamed growth on the eye all feel like grit. If it lasts more than a day or two, an eye exam with dye will usually find the cause.

What is the treatment for foreign body sensation in the eye?

It depends on the cause. Rinse out any particle with clean water or saline. Use preservative-free lubricating drops for dry eye and warm compresses for blepharitis. A scratch needs antibiotic drops from a clinician. Any embedded particle should be removed professionally.

How long does foreign body sensation last after something is removed?

A mild scratch left behind usually stops feeling gritty within 24 to 48 hours. If the feeling lasts longer, gets worse, or comes with pain, blurred vision or light sensitivity, get the eye rechecked, as a fragment may remain or infection may be starting.

Can dry eye feel like something is in my eye?

Yes. A gritty, sandy, burning feeling in both eyes that is worse in the evening, in wind or after screen time is the classic description of dry eye. Watering eyes can also be a sign of dry eye.

Should I go to the ER for something in my eye?

Go to the ER for chemical splashes, high-speed injuries from grinding or hammering, anything stuck in the eye, or loss of vision. A speck that rinses out and leaves the eye comfortable does not need the ER. Persistent grittiness can be seen the same day by an optometrist or urgent care.