For many people who wear contact lenses, the end of the day brings a familiar, watery surprise immediately after removal. This symptom, medically known as epiphora, is the body’s response to excessive tear production. It is a common protective mechanism, where the eye is trying to flush out a perceived irritant or compensate for a lack of moisture. Understanding this reaction involves looking at both the physical act of removal and the underlying physiological state of the eye after a full day of lens wear. While annoying, this reaction signals that the eye has been stressed.
The Reflex: Mechanical Irritation During Removal
The most immediate cause of watering is the physical interaction between your fingers and the highly sensitive surface of the eye. The cornea, the transparent front part of the eye, possesses one of the highest densities of nerve endings in the body. Any direct contact with this surface instantly triggers the corneal reflex, which causes the eyelid to close and the lacrimal glands to produce a flush of tears.
Even with the most careful technique, the act of pinching or sliding the lens off the eye can cause minor friction or a scraping sensation. Using a fingernail instead of the soft pad of the finger, for example, increases the risk of micro-trauma to the delicate corneal epithelium. This physical disruption is interpreted by the eye as an injury or foreign body invasion, prompting the rapid release of tears to wash the irritant away. The watering is a fast, short-lived defense mechanism designed to protect the eye during removal.
Paradoxical Tearing: When Dryness Causes Watering
A complex cause of post-removal watering is the dryness induced by lens wear. Contact lenses, particularly soft lenses, are made of hydrophilic materials that absorb moisture, and they sit directly on the tear film. This presence disrupts the tear film, leading to a faster evaporation rate and a condition known as Contact Lens-Induced Dry Eye (CLIDE).
When the eye is chronically dehydrated or the tear film is unstable, it signals the nervous system that an emergency is taking place. The body responds by generating a flood of reflex tears, which are chemically different from the basal, lubricating tears the eye normally produces. These reflex tears are watery and lack the proper balance of oils and mucus needed to coat the eye effectively, making them poor lubricants.
Removing the contact lens after hours of wear suddenly exposes this dehydrated corneal surface to the air, which can intensify the stress signal to the brain. The emergency tear mechanism activates fully, releasing the excessive volume of watery fluid that causes the eyes to stream. This reaction is often described as “paradoxical tearing” because the watery eyes are actually a symptom of dryness, not a sign of sufficient moisture.
External Triggers: Solution Sensitivity and Deposits
Beyond the mechanical and physiological factors, external agents present on the lens can also provoke irritation and watering. Contact lens solutions contain various chemicals, including preservatives, to keep the lenses sterile. Some individuals develop a sensitivity or mild allergic reaction to these preservatives over time.
This chemical sensitivity can cause inflammation and a persistent irritated state while the lenses are worn, which culminates in a tearing response when the lenses are removed. Furthermore, the daily accumulation of protein, lipid, and calcium deposits on the lens surface acts as a physical irritant. These deposits are concentrated on the lens and continue to rub against the corneal and conjunctival tissue, triggering a final flush of tears.
Prevention and When to Consult a Specialist
Implementing specific care routines can significantly reduce the likelihood of post-removal watering.
Prevention Tips
Using lubricating or rewetting drops about 10–15 minutes before removal can rehydrate both the lens and the eye surface. This extra moisture helps the lens slide off more easily and prevents the immediate exposure of a dry cornea. Always ensure that your hands are clean and dry. Use the soft pads of your thumb and forefinger to gently pinch or slide the lens, avoiding contact with the fingernails.
When to Consult a Specialist
While occasional watering is normal, persistent or severe symptoms suggest the need for professional evaluation. You should consult an eye care specialist if the watering is accompanied by significant pain, persistent redness, blurred vision, or any discharge. These signs may indicate a more serious underlying issue, such as a corneal abrasion or an infection like keratitis. A specialist can also evaluate if a switch to a different solution or lens material designed for dry eyes is appropriate.