Contact lens discomfort usually comes down to one of a handful of causes: dryness, poor fit, buildup on the lens surface, or a reaction to your cleaning solution. Most of these are fixable once you identify the trigger. Here’s what’s likely going on and what to do about it.
How Contacts Disrupt Your Tear Film
The most common reason contacts feel uncomfortable is dryness, and it starts with basic physics. In a healthy eye, your tear film is about 7 micrometers thick. When you place a contact lens on your eye, it splits that tear film into two layers: one in front of the lens and one behind it. The layer in front shrinks to just 1 to 2 micrometers thick, which is far too thin to stay stable for long.
That ultra-thin front layer also has a weaker lipid (oil) coating, which normally acts as a barrier against evaporation. The result: tears evaporate faster and the lens surface dries out. This is why contacts often feel fine in the morning but gritty or sticky by afternoon. Your eyes are literally running out of moisture to keep the lens comfortable.
Screen Time Makes It Worse
If your contacts bother you most during work or while scrolling your phone, your blink rate is the likely culprit. Prolonged screen use cuts your blink rate by about 50%. Since blinking is what spreads fresh tears across the lens surface, halving your blinks means significantly less moisture reaching the lens. The combination of a thinner tear film and fewer blinks creates a dryness feedback loop that makes contacts increasingly uncomfortable throughout the day.
Try the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds. This naturally prompts fuller blinks and gives your tear film a chance to recover.
Your Lenses Might Not Fit Right
Contact lenses aren’t one-size-fits-all. The base curve of the lens needs to match the curvature of your cornea, and when it doesn’t, you’ll feel it.
A lens with a base curve that’s too steep (too small a number) sits too tightly on your eye. This can cause dryness, redness, itching, and in more serious cases, it restricts oxygen flow to your cornea. A lens that’s too flat (too large a base curve) won’t stay centered. It shifts around when you blink, may cause blurry vision, and can even dislodge or fall out entirely. If your contacts constantly slide out of position or feel like they’re suctioned to your eye, the fit is probably wrong. Your eye care provider can measure your cornea and prescribe a better-matched lens.
Protein and Lipid Buildup
Your tears contain proteins, lipids, and mucins that start depositing on a contact lens within minutes of putting it in. Over hours and days, these deposits accumulate into a film that changes how the lens feels against your eye and eyelid. A coated lens creates more friction, holds less moisture, and can trigger an immune response in the tissue lining your upper eyelid.
That immune response has a name: giant papillary conjunctivitis, or GPC. Repeated friction from a deposit-coated lens irritates the underside of your upper eyelid, causing small bumps to form. Symptoms include itching, excess mucus, and a feeling that the lens is constantly sliding up. If your eye care provider suspects GPC, they’ll flip your eyelid to check for these bumps.
Switching to daily disposable lenses is one of the most effective ways to avoid deposit-related discomfort, since you start with a fresh lens every day. CDC data shows that people who don’t follow their recommended replacement schedule experience more complications and eye discomfort overall.
Your Cleaning Solution Could Be the Problem
Sometimes the discomfort isn’t the lens itself but what you’re soaking it in. Multipurpose contact lens solutions contain preservatives to prevent bacterial growth, and some people develop sensitivity to these chemicals over time. Older preservatives like thimerosal (mercury-based), chlorhexidine, and benzalkonium chloride are the most common irritants, but reactions can happen with newer formulations too.
Signs of solution sensitivity include redness, burning, or irritation that starts shortly after inserting your lenses and gradually worsens over weeks or months. If switching to a preservative-free hydrogen peroxide cleaning system resolves your symptoms, that confirms the culprit. These systems neutralize overnight and leave no preservative residue on the lens.
Oxygen Deprivation
Your cornea gets most of its oxygen directly from the air rather than from blood vessels. A contact lens sits between your cornea and the atmosphere, acting as a partial barrier. How much oxygen gets through depends on the lens material’s permeability, measured as Dk/t. Research established that a Dk/t of at least 24 is needed to prevent corneal swelling during daily wear, and a Dk/t of 87 or higher is necessary for extended (overnight) wear.
When your cornea doesn’t get enough oxygen, blood vessels from the surrounding tissue can grow into the cornea to compensate. This process, called neovascularization, is one of the few contact lens complications that isn’t fully reversible. If your eyes are chronically red around the edges of your iris, especially near the colored part, oxygen deprivation may be playing a role. Modern silicone hydrogel lenses allow substantially more oxygen through than older hydrogel materials and are worth asking about if you’re still wearing an older lens type.
Using Eye Drops With Contacts
Rewetting drops can help with midday dryness, but not all eye drops are safe to use while wearing contacts. The key distinction is the preservative. Drops containing benzalkonium chloride or thimerosal can absorb into soft lens materials and slowly release onto your eye, causing irritation rather than relieving it.
Preservative-free drops are the safest option. If you use preserved drops, look for products specifically labeled as contact-lens-compatible, which use newer, higher-molecular-weight preservatives that don’t absorb as readily into the lens. One practical note: thicker, gel-style drops provide longer relief but can temporarily blur your vision right after application, so save those for the end of the day or for after you’ve removed your lenses.
Narrowing Down Your Cause
Pay attention to the timing and pattern of your discomfort, because it points directly to the likely cause:
- Uncomfortable immediately after insertion: solution sensitivity, a damaged or inside-out lens, or poor fit
- Comfortable at first, worse by afternoon: dryness and tear film thinning, especially if you work at a screen
- Worse toward the end of the lens’s replacement cycle: protein and lipid deposits building up on the surface
- Chronic redness at the edges of the iris: possible oxygen deprivation from a low-permeability lens
- Itching and mucus with a sliding sensation: GPC from deposit-related friction on the inner eyelid
Most contact lens discomfort is solvable with a change in lens material, fit, replacement schedule, or care routine. If you’ve been tolerating uncomfortable lenses for months, a refitting appointment is often all it takes to find a combination that works.