2. Dry eyes.
Another factor that can trigger both noninfectious and infectious keratitis is dry eyes. In order for the eyes to function properly, they need to remain consistently moist. They naturally produce tears, which helps to cleanse out foreign objects, including dust, dirt, and debris. Sometimes, the eyes fail to self-lubricate; environmental conditions and other factors, such as lack of sleep or taking certain medications, can also contribute to dry eye.
No matter the reason, dry eyes can increase the risk of keratitis. When the eyes are dry, they are unable to flush out dust, dirt, and debris; they are also more prone to bacteria, viruses, and fungi. As a result, dry eyes can lead to the development of either noninfectious or infectious keratitis, as the cornea can become inflamed as a result of the dirt and debris or any bacteria, virus, or fungus that has entered the eye.