What Is The Gunk In The Outer Corner Of My Eye??
The "gunk" that collects in the corner of your eye is commonly called rheum (or "sleep crust") and is a normal, protective byproduct of your eye's self-cleaning process. This substance is a mixture of materials shed from the ocular surface, including mucus (produced by the conjunctiva), oil (meibum from the eyelid glands), exfoliated skin cells, and microscopic foreign debris like dust, which are all suspended in the watery component of the tears. During the day, blinking washes this material away through the tear ducts, but when you sleep, blinking stops. This allows the materials to accumulate and collect in the corners of the eye, drying into a crusty or sticky residue.
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The "gunk" that collects in the corner of your eye is commonly called rheum (or "sleep crust") and is a normal, protective byproduct of your eye's self-cleaning process. This substance is a mixture of materials shed from the ocular surface, including mucus (produced by the conjunctiva), oil (meibum from the eyelid glands), exfoliated skin cells, and microscopic foreign debris like dust, which are all suspended in the watery component of the tears. During the day, blinking washes this material away through the tear ducts, but when you sleep, blinking stops. This allows the materials to accumulate and collect in the corners of the eye, drying into a crusty or sticky residue.
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What Is Normal Versus Abnormal Eye Discharge?
A small amount of eye discharge, typically dry, crusty, and ranging in color from clear to white or a pale cream color upon waking, is considered normal rheum. It should be minimal enough that it doesn't stick your eyelids together or interfere with vision. This normal discharge is simply the eye's waste removal system at work, cleaning the ocular surface while you are resting.
Discharge becomes abnormal when its quantity, color, or consistency changes significantly. Abnormal discharge is a sign of an infection, inflammation, or allergic reaction. For example, a thick, sticky, or purulent discharge that's distinctly yellow or green usually indicates a bacterial infection, such as bacterial conjunctivitis (pink eye). This type of discharge may be so excessive that it causes the eyelids to be stuck together upon waking.
What Causes Mucus-Like Or Stringy Discharge?
Excessive watery or clear, stringy discharge is frequently associated with viral conjunctivitis or allergic conjunctivitis. Viral conjunctivitis, accompanying an upper respiratory infection, causes inflammation of the conjunctiva, leading to excessive watery tears mixed with mucus. The discharge is typically clear or slightly cloudy, and affects one eye before spreading to the other.
In cases of allergic conjunctivitis, the eyes react to allergens like pollen or dander by producing a large volume of clear, watery fluid that may contain sticky, stringy white mucus. This type of discharge is usually accompanied by intense itching and affects both eyes simultaneously. While not infectious, the amount of fluid can be significant and irritating.
What Causes Thick, Crusting Discharge Along The Eyelids?
Thick, crusty discharge that collects along the eyelid margins and base of the eyelashes is a common symptom of blepharitis. Blepharitis is a chronic inflammation of the eyelids, caused by an overgrowth of bacteria normally present on the skin or by clogged oil glands (meibomian glands) near the eyelashes. The inflammation causes abnormal oil and cell production, resulting in oily, dandruff-like flakes and crusts that accumulate and may cause the eyelids to stick together.
Another localized cause of crusting and discharge is a stye, which is an infected oil gland or eyelash follicle at the edge of the eyelid. A stye presents as a painful, red lump and can lead to a localized release of pus-like, yellow, discharge. This discharge may then crust over the affected area, though the issue is confined to the eyelid margin rather than the entire ocular surface.
What To Remember About Eye Gunk
Normal, minimal eye gunk (rheum) is a natural, healthy byproduct of the eye's self-cleansing system, composed of mucus, oil, and debris, and is white or clear.
Excessive discharge, particularly if it's thick, yellow, or green, is an indication of an underlying problem like bacterial conjunctivitis or blepharitis and requires professional medical attention to prevent complications.
References
Cleveland Clinic. Eye Discharge (Eye Mucus): Causes, Types & Treatment.
All About Vision. Eye Discharge: Causes, Types and Treatment.
American Academy of Ophthalmology (AAO). Discharge From Eye.
Healthdirect. Eye discharge.
Medical News Today. Eye boogers: Causes and how to get rid of them.
University of Utah Health. Is That Morning 'Eye Gunk' Normal?.
NHS. Blepharitis.