Why Eye Hydration Matters
Healthy vision relies on a well-hydrated ocular surface. Tears are not just “water for the eyes”—they are a complex fluid that protects, lubricates, and nourishes the cornea. When tear production is insufficient or when tears evaporate too quickly, the result can be ocular dryness, irritation, and discomfort. Over time, this can compromise ocular surface health and reduce overall comfort in daily life.
Two of the most widely recognized clinical markers of eye hydration are:
- Schirmer’s Test: Measures the volume of natural tear secretion.
- Tear Break-Up Time (TBUT): Assesses the stability of the tear film before it begins to break apart.
These tests provide objective insights into ocular hydration and are considered key indicators in evaluating interventions that support eye surface health.
The Role of Nutrition in Eye Hydration
While artificial tears and topical lubricants may help temporarily, they do not address the underlying ability of the eye to produce and stabilize its own tear film. This is where nutrition has emerged as a complementary approach.
Carotenoids such as lutein and zeaxanthin have traditionally been recognized for their role in supporting eye health. A recent clinical study now suggests that they may also contribute to tear secretion and tear film stability—two factors directly linked to hydration and ocular comfort.
Clinical Evidence: The Lute-gen® Study
A 70-subject, 6-month, randomized, double-blind, placebo-controlled trial published in Frontiers in Nutrition (2025) evaluated the effects of Lute-gen® (a formulation of lutein and zeaxanthin) on physiological markers of ocular hydration in healthy adults, with no significant baseline complaints on average.
Key Findings:
- Schirmer’s Test: Participants receiving Lute-gen® demonstrated significantly improved tear secretion compared to placebo, indicating better ocular surface hydration.
- Tear Break-Up Time: The supplementation group also showed increased tear film stability, suggesting enhanced protection and lubrication of the eye.
Importantly, the study reported that supplementation was well tolerated, with no serious adverse events.
What This Means for Eye Health
These results suggest that lutein and zeaxanthin may provide measurable support for ocular hydration, even if individuals do not immediately perceive noticeable changes. Enhancing tear secretion and improving tear film stability may help maintain a more hydrated and comfortable ocular surface, which is essential for long-term eye health.
Practical Takeaways
- Stay hydrated: Adequate water intake supports overall and ocular hydration.
- Improve your environment: Humidifiers or reducing direct airflow can reduce tear evaporation.
- Include carotenoid-rich foods: Spinach, kale, corn, and eggs naturally provide lutein and zeaxanthin.
- Consider supplementation: The recent clinical study found that Lute-gen® improved recognized markers of ocular hydration, supporting the maintenance of comfortable, hydrated eyes.
Disclaimer
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.