Drinking enough water is essential to the body’s proper functioning, and the eyes are no exception. Adequate hydration contributes to tear production and helps maintain a comfortable ocular surface.
Tears Are Much More Than Water
Every blink spreads a thin tear film across the surface of the eye. This film consists of three complementary layers: an oily layer that slows evaporation, a watery layer that moisturizes and nourishes eye tissue, and a mucus layer that helps tears adhere to the eye. Together, they protect and lubricate the eyes while supporting clear vision.
When the tear film is insufficient or does not function properly, the eyes may become dry, red, or irritated. Burning, a gritty sensation, sensitivity to light, or temporarily blurred vision may also occur.
Can Hydration Prevent Dry Eye?
Drinking enough water helps the body perform its normal functions and may support adequate tear production. The Canadian Association of Optometrists includes proper hydration among the lifestyle habits that may help reduce dry eye symptoms.
However, drinking more water will not resolve every form of dry eye. Symptoms may also be caused by tears evaporating too quickly, aging, certain medications, hormonal changes, contact lens wear, or underlying health conditions.
Factors That Can Increase Discomfort
Even someone who is properly hydrated may experience dryness due to factors such as:
- Spending long periods in front of a screen;
- Heated, air-conditioned, or low-humidity environments;
- Wind, smoke, or pollution;
- Prolonged contact lens wear;
- Significant alcohol consumption;
- Certain medications or health conditions.
When looking at a screen, we also tend to blink less often, which can increase tear-film evaporation.
Simple Everyday Habits
To support eye comfort:
- Drink water regularly throughout the day;
- Keep a water bottle nearby while working or exercising;
- Take visual breaks when using screens;
- Remember to blink consciously;
- Avoid directing fans or air vents toward your face;
- Use a humidifier when indoor air is very dry;
- Follow the recommended wear and care instructions for your contact lenses.
There is no single ideal amount of water for everyone. Individual needs vary depending on factors such as diet, temperature, physical activity, and overall health.
When Should You Seek Advice?
Good hydration can contribute to visual comfort, but it is not a substitute for an eye exam or appropriate treatment. If your eyes remain dry, red, or painful, or if your symptoms interfere with your daily activities, speak with an IRIS eye care professional.
