A person may have mites without needing treatment. EyeWiki likewise notes that detecting Demodex without clinical symptoms does not, by itself, warrant treatment. Diagnosis needs to take into account the person’s symptoms and examination findings rather than simply the presence of mites.
So the image may illustrate something biologically real, but its dramatic appearance should not be interpreted as a diagnosis.
Chapter 3 — When Do These Mites Become a Problem?
The concern begins when Demodex becomes associated with inflammation or other eye symptoms.
An excessive population of mites can contribute to irritation around the
According to ophthalmology references, Demodex may be associated with conditions such as blepharitis, conjunctivitis, chalazia and other ocular surface problems.
One particularly recognizable sign is a cylindrical sleeve or collar-like debris around the base of the eyelashes, sometimes called a Demodex collarette.
These deposits can contain material associated with mites, including partially digested epithelial material, waste and eggs.
Therefore, if someone repeatedly notices crusting or unusual debris concentrated around the roots of their eyelashes, especially together with irritation or redness, an eye examination can help determine the cause.
Chapter 4 — The Symptoms May Start Very Subtly
Demodex-related eyelid inflammation does not necessarily begin with dramatic swelling.
Some people may initially notice relatively mild symptoms such as:
- Itchy eyelids
- Burning or irritation
- A gritty or foreign-body sensation
- Watery eyes
- Dry eyes
- Crusting around the eyelashes
- Redness along the eyelid margin
Blurred vision or eyelash loss can also occur in some
Demodex, however.
Dry eye disease, allergies, bacterial blepharitis, skin conditions, contact-lens problems and other eye disorders can produce similar complaints. That’s why trying to diagnose the cause simply by looking at an online photograph can be misleading.
The key is persistent or recurrent symptoms, rather than the occasional itchy eye.
Chapter 5 — Why Can the Eyelids Become Red and Inflamed?
The image shows intensely red eyelids, but redness alone does not prove that Demodex is responsible.
Blepharitis is a general term for inflammation of the eyelids, and it can have several causes. The American Academy of Ophthalmology describes factors including bacterial overgrowth, problems with eyelid oil glands, dandruff-related skin conditions and an over-population of microscopic Demodex mites.
