Contact lens pain usually comes down to one of a handful of causes: dry eyes, a poor-fitting lens, dirty lenses or cases, or an allergic reaction to your lens material or solution. Less commonly, it signals something more serious like a corneal ulcer. Most of the time the fix is straightforward, but knowing which type of discomfort you’re dealing with helps you figure out the right next step.
Dry Eyes Are the Most Common Culprit
Your tear film is a thin, layered coating that keeps the surface of your eye lubricated and comfortable. When you put in a contact lens, it physically splits that tear film into two thinner layers, one above the lens and one below. This disrupts the oily top layer that normally slows evaporation, so your tears break down faster and your eyes dry out more quickly than they would without lenses.
The effects go deeper than just surface dryness. Contact lens wear reduces the protective mucus layer your corneal cells produce, which increases friction between the lens and your eye with every blink. Over months of wear, the cells that produce lubricating mucus can decrease in number, making dryness progressively worse. The good news is that this appears to be reversible: studies show these cell counts return to normal after people stop wearing lenses for a period.
Screen time makes all of this worse. You normally blink around 15 to 20 times per minute, but when staring at a screen, that drops to about three to seven times per minute. Since blinking is what spreads fresh tears across the lens surface, hours of screen work can leave your contacts feeling scratchy, stinging, or like they’re stuck to your eye by the end of the day. Making a conscious effort to blink more often while using screens is one of the simplest fixes available.
Your Lenses Might Not Fit Right
Contact lenses aren’t one-size-fits-all. A soft lens should glide slightly with each blink but stay centered over your pupil. When a lens is too tight, it presses against the cornea, blocks tear flow underneath, and restricts oxygen from reaching the eye’s surface. When it’s too loose, it slides around and creates friction with every blink or eye movement.
Signs of a poor fit include vision that blurs or shifts when you blink, eyes that get progressively more red and irritated the longer you wear your lenses, and the feeling of constantly needing to adjust or reposition a lens. A tight lens can also cause corneal swelling, which shows up as hazy vision and aching discomfort that gets worse over the course of the day. If your lenses felt fine when you first got them but have gradually become uncomfortable, your prescription or eye shape may have changed enough to affect the fit.
Dirty Lenses and Cases Build Up Bacteria
Hygiene shortcuts are one of the fastest paths to painful, red eyes. The CDC recommends rubbing and rinsing your lenses with fresh solution every time you take them out, even if the solution label says “no rub.” Your lens case needs the same treatment: rinse it with fresh solution (never water), dry it with a clean tissue, and store it upside down with the caps off so it can air out completely.
One of the most common mistakes is “topping off,” which means adding new solution on top of old solution left in the case. This dilutes the disinfecting power and lets bacteria thrive. Protein deposits, bacteria, and debris accumulate on lenses and cases over time, and all of that material sits directly against your eye. The result ranges from mild irritation and scratchiness to full-blown infection.
Allergic Reactions to Lenses or Solutions
Some people develop an allergic or inflammatory reaction not to the lens itself, but to the proteins that build up on it or to preservatives in their cleaning solution. Certain chemical preservatives in multipurpose solutions can trigger a delayed allergic response, causing redness, corneal inflammation, and eventually an inability to tolerate wearing lenses at all. Switching to a preservative-free solution or a hydrogen peroxide-based system often resolves this.
A condition called giant papillary conjunctivitis (GPC) is particularly common in lens wearers. The inside of the upper eyelid becomes inflamed and develops small bumps from repeated friction against the lens. Symptoms include itchy, sore eyes, thick or stringy mucus, a persistent foreign-body sensation, and blurred vision. GPC typically affects both eyes and tends to worsen gradually, so many people don’t realize what’s happening until it becomes hard to wear lenses at all. Treatment usually involves switching lens types, wearing lenses less frequently, or taking a break from them entirely.
Your Lens Material Matters
Not all contact lenses let the same amount of oxygen through to your cornea, and oxygen deprivation is a real source of pain and complications. Your cornea has no blood vessels; it gets its oxygen directly from the air through your tear film. A contact lens acts as a barrier.
Silicone hydrogel lenses are significantly more breathable than traditional hydrogel lenses. Research has established that lenses need a minimum oxygen transmissibility to avoid corneal swelling during daily wear, and some older hydrogel lenses don’t meet that threshold. No hydrogel lens meets the oxygen requirements for safe overnight wear. If you’re wearing an older lens type or regularly sleeping in your contacts, oxygen starvation could be causing your discomfort, showing up as burning, redness, or a gritty sensation that worsens throughout the day.
When Pain Signals Something Serious
Most contact lens discomfort is annoying but manageable. A corneal ulcer is not. This is an open sore on the surface of your eye, usually caused by a bacterial infection that gets a foothold through tiny abrasions from lens wear. The warning signs are distinct: severe pain that doesn’t improve after removing the lens, sensitivity to light, eye discharge, blurred vision, and significant redness concentrated in a ring around the colored part of your eye. In advanced cases, pus can collect inside the eye. A corneal ulcer can cause permanent vision loss and needs same-day medical attention.
Corneal ulcers are far more likely in people who sleep in their contacts, swim while wearing them, or skip proper cleaning routines. The risk isn’t theoretical: contact lens wear is the leading risk factor for this type of infection in otherwise healthy eyes.
Practical Steps to Reduce Lens Discomfort
If your contacts are consistently uncomfortable, work through the most common causes systematically:
- Rule out dryness first. Preservative-free rewetting drops designed for contact lenses can tell you quickly whether hydration is the issue. If drops help but the problem returns within an hour, your tear film may need more support than drops alone provide.
- Audit your hygiene routine. Replace your lens case at least every three months. Use only fresh solution, never top off, and never let water touch your lenses or case.
- Consider your solution. If you’ve recently switched brands and noticed new irritation, the preservative system may not agree with your eyes. A hydrogen peroxide-based system eliminates preservative exposure entirely.
- Check your wearing schedule. Wearing lenses longer than recommended, whether that’s daily disposables worn for two days or monthlies stretched to six weeks, concentrates deposits and increases friction and infection risk.
- Reduce screen-related dryness. Follow the 20-20-20 pattern: every 20 minutes, look at something 20 feet away for 20 seconds. Consciously blink several times during the break.
If none of these adjustments help, or if your discomfort appeared suddenly rather than building gradually, the fit or material of your lens likely needs to change. A lens that worked well two years ago may no longer be the right choice for your eyes.