The relationship between demodex and ocular discomfort

Area of Science:

• Ophthalmology
• Parasitology
• Epidemiology

Background:

• Demodex mites are common ectoparasites found on human skin and eyelashes.
• The role of Demodex in ocular surface disease and discomfort is an area of ongoing research.

Purpose of the Study:

• To investigate the correlation between Demodex mite prevalence on eyelashes and the severity of ocular discomfort.
• To explore the demographic and epidemiological factors associated with Demodex infestation.

Main Methods:

• Eyelash samples from 170 patients were examined for Demodex mite presence and count.
• Patients completed questionnaires on ocular discomfort and underwent ophthalmic examinations, including tear film breakup time (BUT) and Schirmer testing.
• Statistical analysis was performed to correlate Demodex load with clinical findings and patient demographics.

Main Results:

• Demodex was detected in 70% of patients, with 54% of examined eyelashes infested.
• The number of Demodex mites showed significant positive correlations with increasing age, reported ocular discomfort, and reduced tear film BUT.
• Higher Demodex counts were observed in patients with conjunctival papillary hypertrophy.

Conclusions:

• A significant correlation exists between the density of Demodex mites and the severity of ocular discomfort.
• The findings suggest Demodex plays a pathogenic role in age-related ocular discomfort.