National Mechanical Dry Eye Day

History of National Mechanical Dry Eye Day

National Mechanical Dry Eye Day began in 2020. BioTissue, a company that makes treatments for eye conditions, created it.

Their goal was to raise awareness about mechanical dry eye—a condition many people didn’t know existed.

This form of dry eye isn’t caused by low tear production. Instead, it’s often due to loose tissue inside the lower eyelid. That tissue presses between the eye and the lid, which disrupts the natural flow of tears. The result is burning, blurred vision, and sometimes too much tearing.

BioTissue saw that doctors often missed this cause. Many people were told they had regular dry eye and were given treatments that didn’t work.

By launching a day for mechanical dry eye, the company hoped more eye care providers would recognize the signs. They wanted patients to understand that their symptoms might come from something other than dryness alone.

This observance invites people—especially those over sixty—to learn more about their eye health. It also encourages doctors to take a closer look during exams.

Simple tests can reveal if extra folds of tissue are causing the problem. With the right diagnosis, people can finally get the help they need. That’s why this day matters. It turns confusion into answers.

Facts About National Mechanical Dry Eye Day

Hidden Folds of Tissue Are a Major Cause of “Dry Eye” in Seniors

Mechanical dry eye is often linked to a condition called conjunctivochalasis, where the clear membrane covering the white of the eye develops loose, sagging folds.

Large clinical series have found conjunctivochalasis in a significant share of older adults, sometimes in more than half of patients over 60, yet it is frequently overlooked as a source of burning, tearing, and irritation that can mimic or worsen classic dry eye disease.  

How Conjunctival Folds Disrupt the Eye’s Natural Tear Reservoir

In a healthy eye, tears collect in a narrow “tear meniscus” along the eyelid margin before spreading over the cornea. Conjunctivochalasis creates small folds that physically break up this meniscus and divert tears away from the cornea or toward the inner corner of the eye.

High‑resolution imaging studies have shown that these folds reduce the stability and height of the tear meniscus, which can cause both reflex tearing and a paradoxical feeling of dryness at the same time.  

Blinking and Gravity Can Turn Loose Tissue into a Mechanical Irritant

Every blink pulls the eyelid across the surface of the eye, and in conjunctivochalasis, the loose conjunctival folds get pinched or rubbed between the lid and the eyeball.

Research suggests that years of blinking, gravity, and age-related tissue thinning all contribute to these folds becoming large enough to interfere with tear spreading and cause mechanical friction, which helps explain why symptoms are often worse while reading, using screens, or looking down.  

Why Standard Dry Eye Tests Can Miss Mechanical Problems

Traditional dry eye evaluations often focus on how fast tears evaporate or how much tear fluid a person produces. In mechanical dry eye, those tests can look nearly normal because the primary problem is obstruction of flow, not lack of tears.

Studies comparing patients have shown that careful slit‑lamp examination of the lower lid and conjunctiva, sometimes with fluorescein dye or anterior segment OCT imaging, is needed to visualize the actual folds and distinguish mechanical causes from purely evaporative or aqueous‑deficient dry eye.  

Surgical Smoothing of the Conjunctiva Can Relieve Persistent Symptoms

When lubricating drops and other conservative measures do not control symptoms, eye surgeons can remove or smooth the redundant conjunctival tissue so tears can flow freely again.

Procedures such as conjunctival resection or reconstruction with amniotic membrane have been shown in clinical studies to restore a more regular tear meniscus, reduce reflex tearing and foreign‑body sensation, and significantly improve quality‑of‑life scores in patients with moderate to severe conjunctivochalasis.

Mechanical Dry Eye Often Coexists With Other Ocular Surface Diseases 

Conjunctivochalasis and related mechanical problems rarely occur in isolation. Research has found strong associations with meibomian gland dysfunction, allergic eye disease, and previous eye surgeries, especially cataract procedures.

These overlapping conditions can compound irritation and make it harder to identify the main driver of symptoms, which is why experts recommend evaluating eyelid glands, conjunctiva, and tear dynamics together rather than treating “dry eye” as a single uniform disease.  

Imaging Technologies Are Redefining How Tear Flow Is Studied

Newer imaging tools have allowed researchers to watch how tears move in real time and to quantify mechanical obstruction.

Anterior segment optical coherence tomography and high-speed videography can show the shape of the tear meniscus, how it changes with each blink, and how conjunctival folds disturb the tear film.

These techniques are helping clinicians refine the diagnostic criteria for mechanical dry eye and may guide more targeted treatments in the future.