Cataracts themselves do not directly cause watery eyes. The hallmark symptoms of a cataract are blurred or hazy vision, increased glare sensitivity, and faded color perception, not tearing. However, people with cataracts frequently do experience watery eyes, and the reasons for that overlap are worth understanding. In many cases, the watering comes from a separate condition that happens to be common in the same age group, or it emerges after cataract surgery rather than before it.
What Cataracts Actually Do
A cataract is a clouding of the eye’s natural lens, which sits behind the iris and pupil. As proteins in the lens clump together over time, they scatter light instead of letting it pass through cleanly. The result is a slow, progressive decline in visual clarity. Early on, you might notice that headlights seem more glaring at night or that colors look slightly washed out. Over months or years, the cloudiness thickens, and everyday tasks like reading or driving become harder.
None of this involves the tear film or the surface of the eye. A cataract is an internal structure problem, deep behind the cornea. It does not irritate the eye’s surface, inflame the eyelid margins, or block tear drainage. So when someone with cataracts also has watery eyes, the tearing usually has a different explanation.
Why Watery Eyes and Cataracts Show Up Together
Both cataracts and most causes of chronic watery eyes become more common with age. Cataracts affect roughly half of adults by their mid-seventies, and the conditions that trigger excessive tearing, such as dry eye disease, eyelid laxity, and partial blockage of the tear drainage system, follow a similar age curve. It is easy to assume one is causing the other when really they are both products of aging tissue.
One of the most common reasons older adults tear up is actually dry eye. That sounds paradoxical, but here is what happens: when the tear film is thin or unstable, the cornea becomes exposed and irritated, which triggers a reflex flood of watery tears to compensate. These reflex tears are different from the steady, lubricating tear film your eyes normally maintain. They rush in too fast, overwhelm the drainage system, and spill over the eyelid margin. If you have both cataracts and this kind of reflex tearing, the cataract did not cause it. The dry, irritated surface did.
Lid problems add another layer. As skin and connective tissue lose elasticity, the lower eyelid can sag outward (ectropion) or turn inward (entropion). Ectropion pulls the tiny drainage openings, called puncta, away from the eye’s surface, so tears cannot drain properly and instead roll down the cheek. In one documented case, even periocular dermatitis, a skin irritation around the eye, was enough to cause ectropion in an older patient whose lid tissue had already lost some of its elasticity.1Journal of the American Academy of Dermatology. Ectropion caused by periocular dermatitis These lid-position problems frequently coexist with cataracts because both are age-related, but neither one causes the other.
Blocked Tear Drainage and Surgical Overlap
When tears are produced normally but cannot drain through the nasolacrimal duct into the nose, they pool on the eye surface and spill over. This is called epiphora. It can result from a partial or complete blockage of the duct, chronic inflammation at the punctal opening, or laxity of the eyelid that pulls the punctum out of position.
Some patients who come in for cataract evaluation turn out to have both a cataract and a drainage problem contributing to watery eyes. When lid laxity and punctal ectropion are present alongside a blocked duct, surgeons sometimes combine procedures. One study found that about one in seven patients undergoing tear-duct surgery also needed a simultaneous lid-tightening procedure because of punctal ectropion with lid laxity, and the combined approach had a success rate around 87 percent, comparable to duct surgery alone.2PubMed Central. The effectiveness of a simultaneous medial spindle procedure for involutional punctal ectropion with lid laxity in patients who require endonasal dacryocystorhinostomy instead of external dacryocystorhinostomy to prevent pump failure The point for anyone reading this with both cataracts and watery eyes is that the tearing has its own treatable cause. Removing the cataract will improve your vision, but it will not fix a blocked duct or a sagging lower lid.
Watery and Dry Eyes After Cataract Surgery
Here is where cataracts and tearing do become genuinely connected: the surgery itself. Modern cataract surgery (phacoemulsification) is safe and routine, but it still disrupts the eye’s surface. The corneal incisions, the microscope light shining on the open eye during the procedure, and the post-operative eye drops all stress the tear film. The result, somewhat ironically, is that many people develop new dry eye symptoms after having their cataract removed. And as discussed above, dry eyes often trigger reflex tearing, so the surgery meant to fix blurred vision can temporarily produce the watery eyes the patient may never have had before.
Research on tear film changes after cataract surgery consistently shows a measurable drop in tear volume in the weeks following the procedure. One study found that the tear meniscus height, a measure of how much tear fluid sits along the lower eyelid, was significantly lower at one week, one month, and even three months after surgery compared to before it.3PubMed Central / BMC Ophthalmology. Tear film assessment before and after phacoemulsification in patients with age-related cataracts Another study found that patients who already had dry eye before surgery experienced significant worsening of symptoms at two months, and those who had no dry eye beforehand developed measurable dry eye changes as well. The degree of worsening correlated with how long the microscope light was focused on the eye during surgery, not with the amount of ultrasound energy used to break up the cataract.4PubMed Central. Dry eye after cataract surgery and associated intraoperative risk factors
The practical takeaway: if your eyes feel gritty, burn, or water more than usual in the first few months after cataract surgery, that is a recognized and well-documented side effect. For most people, it resolves gradually. But for patients who already had borderline dry eye before the operation, the post-surgical flare can linger and may need specific treatment.
Why Post-Surgical Eye Drops Can Make Things Worse
After cataract surgery, you will use medicated eye drops for weeks, typically an antibiotic and an anti-inflammatory steroid drop. Many of these contain a preservative called benzalkonium chloride (BAC), which helps prevent contamination in the bottle but also irritates the eye surface. A study comparing BAC-preserved dexamethasone drops to preservative-free dexamethasone drops after cataract surgery found that the preserved version caused a significant increase in corneal staining (a sign of surface damage) and more foreign-body sensation by the second week. The preservative-free version produced milder dry eye symptoms overall.5PubMed Central. Assessment of the eye surface and subjective symptoms after using 0.1% dexamethasone drops with and without preservatives in patients after cataract surgery
This matters because the surface irritation from preserved drops feeds directly into the reflex-tearing cycle. If your eyes are watering excessively after surgery and you are using preserved drops, ask your surgeon whether a preservative-free option is available. It is a small change that can meaningfully reduce surface irritation during recovery.
Post-Surgical Inflammation That Mimics Other Problems
Watery, red, or irritated eyes after cataract surgery are most often caused by the surface disruption just described. But in uncommon cases, more serious inflammation can develop inside the eye. Two conditions worth being aware of are toxic anterior segment syndrome (TASS) and persistent anterior uveitis.
TASS is an acute, sterile inflammatory reaction in the front chamber of the eye. It typically shows up within a day or two of surgery and is not caused by infection but rather by a contaminant, such as residual cleaning agents on surgical instruments, impurities in irrigating solutions, or degraded ophthalmic viscoelastic devices. The hallmark signs include pronounced corneal swelling from edge to edge, cloudy fluid in the front chamber of the eye, and sometimes fibrin deposits on the new lens implant.6PubMed Central. Toxic anterior segment syndrome (TASS): A review and update A late-onset form has also been documented, where symptoms appear days rather than hours after the procedure.7PubMed. Late-onset toxic anterior segment syndrome presenting with predominant corneal edema after cataract surgery: a case series TASS is rare and usually resolves with aggressive steroid treatment, but it requires prompt diagnosis to distinguish it from infection, which needs a completely different treatment approach.
Persistent uveitis, or ongoing low-grade inflammation inside the eye, is another possibility, particularly when cataract surgery is combined with additional procedures. One study found that adding endoscopic cyclophotocoagulation (a glaucoma treatment) to standard cataract surgery raised the rate of persistent uveitis from under 2 percent to about 15 percent.8Dove Press / Clinical Ophthalmology. Endoscopic Cyclophotocoagulation Combined with Phacoemulsification Increases Risk of Persistent Anterior Uveitis Compared to Phacoemulsification Surgery Alone Uveitis can cause tearing, light sensitivity, redness, and blurred vision. If these symptoms persist beyond the expected recovery window after combined surgery, it is worth flagging for your ophthalmologist.
Treating the Surface Before Treating the Cataract
Because cataracts and surface problems so often coexist, many surgeons now emphasize treating the eye surface before scheduling cataract surgery. The reasoning goes beyond comfort. An unstable or dry ocular surface distorts the measurements that surgeons rely on to choose the right lens implant. If the tear film is uneven, the corneal curvature readings come back inaccurate, and the implant power calculation can be off, leading to a refractive surprise after surgery. For patients choosing premium lens implants like toric or multifocal lenses, where precision matters even more, this pre-operative surface optimization is especially important.9PubMed. Preoperative optimization of ocular surface disease before cataract surgery
In practical terms, this might mean starting artificial tears several weeks before surgery, treating any blepharitis (eyelid margin inflammation) with warm compresses and lid hygiene, or using a short course of anti-inflammatory drops to calm the surface. If you have been tearing a lot leading up to your cataract surgery, tell your surgeon. It may not delay the procedure, but it could change the preparation plan and improve your outcome.
How to Tell What Is Actually Causing Your Watery Eyes
If you have cataracts and watery eyes, a few patterns can help you and your eye care provider sort out what is going on:
- Reflex tearing from dry eye: The eyes feel gritty or burning, especially in wind, air conditioning, or after prolonged screen use. The watering comes in surges rather than being constant. Artificial tears tend to help because they stabilize the surface and reduce the irritation that triggers the reflex.
- Blocked tear drainage: One eye (or both) tears constantly regardless of conditions. There may be a sticky discharge if the blocked duct has become infected. Pressing on the inner corner of the eye near the nose may produce a reflux of fluid. Artificial tears do not help because the problem is outflow, not inflow.
- Eyelid malposition: The lower eyelid visibly sags away from the eye or turns inward, causing irritation. You might notice that the inner rim of the lid is visible or that the lid does not snap back quickly when pulled down gently.
- Post-surgical irritation: Watering begins or worsens within days to weeks of cataract surgery. The eyes feel sandy or foreign-body-like. Symptoms often peak in the first month and gradually improve over three months.
Each of these has a different treatment path. Dry eye responds to lubrication, lid hygiene, and sometimes prescription anti-inflammatory drops. Blocked ducts may need a probe-and-irrigate procedure or, in more severe cases, surgical creation of a new drainage pathway. Lid malposition is corrected with minor surgical tightening. And post-surgical surface disruption is managed with lubricants, preservative-free drops when possible, and patience. None of these are addressed by cataract removal itself.
Allergies and Other Overlooked Culprits
People sometimes attribute every eye symptom to their cataract once they know they have one, and watery eyes are a common example. But seasonal or perennial allergic conjunctivitis is extremely prevalent and produces watery, itchy, red eyes that have nothing to do with the lens. Similarly, exposure to smoke, chemical fumes, or strong wind can trigger reflex tearing at any age. Certain medications, including some blood pressure drugs and chemotherapy agents, can increase tearing as a side effect.
Even contact lens wear, in patients who use contacts in the non-cataract eye or who wore them for years before developing cataracts, can leave lasting changes to the tear film and meibomian glands that contribute to chronic tearing. The broader point is that the list of things that cause watery eyes is long, and cataracts are not on it. The fact that both are present at the same time does not make one the cause of the other. A proper evaluation, ideally before cataract surgery is planned, helps untangle the actual contributors and ensures each one gets the right treatment.