Tear lipid layer thickness with eye drops in meibomian gland dysfunction

Area of Science:

• Ophthalmology
• Dry Eye Disease Research
• Ocular Surface Disease

Background:

• Meibomian gland dysfunction (MGD) is a common cause of evaporative dry eye disease.
• The lipid layer of the tear film is crucial for maintaining ocular surface hydration and stability.
• Previous emollient eye drops have shown potential in managing MGD, but specific formulations require evaluation.

Purpose of the Study:

• To assess the efficacy of a reformulated lipid-containing emollient eye drop (Soothe XP) in enhancing tear film lipid layer thickness (LLT).
• To compare the effects of Soothe XP against a non-emollient control eye drop (Systane Ultra) in subjects with MGD-related dry eye.
• To evaluate the impact of a single instillation of study eye drops on LLT in the target patient population.

Main Methods:

• A prospective, single-center, open-label, cross-over, examiner-masked study was conducted.
• Participants (n=40) with MGD and lipid-deficient dry eye were enrolled, meeting specific LLT and blink criteria.
• Subjects received either Soothe XP or Systane Ultra, then crossed over for the alternate treatment, with LLT measured before and 15 minutes after instillation.

Main Results:

• Soothe XP significantly increased LLT by 28.0 nm (P<0.001) 15 minutes post-instillation, reaching a mean LLT of 77.5 nm.
• The non-emollient control eye drop (Systane Ultra) did not produce a statistically significant change in LLT from baseline.
• The study demonstrated a clear benefit of the lipid-containing emollient drop in augmenting the tear film's lipid layer.

Conclusions:

• Lipid-containing emollient eye drops, such as the reformulated Soothe XP, are effective in increasing tear film lipid layer thickness in individuals with MGD.
• The findings support the use of emollient eye drops as a therapeutic strategy for managing the lipid layer deficiency characteristic of MGD-related dry eye.
• Soothe XP's formulation effectively addresses the compromised lipid layer in MGD patients, offering a potential improvement in tear film stability.