Your eyes itch the moment you step outside. By lunch they burn. By the end of the workday they feel like sandpaper, and the over-the-counter allergy pill you took with breakfast does not seem to be helping. If anything, it made things worse. There is a reason for that, and it is the same reason a lot of Frisco patients spend March through May miserable when they should not have to.
The overlap nobody warns you about
Spring brings two separate problems to the ocular surface, and they show up at the same time.
- Allergic conjunctivitis. Pollen from cedar, oak, grasses, and ragweed triggers an immune response. The hallmark symptom is itch, and patients often rub their eyes raw trying to scratch it.
- Evaporative dry eye. Indoor air conditioning runs harder, humidity drops, and screen-driven incomplete blinking thins the tear film. Symptoms are burning, grittiness, and blur that clears when you blink.
Both can produce watery eyes. Both can make vision fluctuate. The wrong diagnosis means the wrong treatment, and the wrong treatment is exactly what allergy season does to a lot of people.
How antihistamines backfire
Oral antihistamines (Zyrtec, Claritin, Allegra, Benadryl) work by drying mucous membranes. That includes the lacrimal glands. If your tear film was already borderline, ten days of daily allergy medication can push you into clinical dry eye. The runny nose stops. The eye symptoms get louder.
Decongestants do the same thing. So do some antidepressants, ADHD stimulants, and isotretinoin. When a patient's eyes feel worst in spring, the medicine cabinet is often part of the story. We always ask.
A quick self-check
Some clues to which condition is driving your symptoms:
- Itching is the loudest symptom? Probably allergy.
- Burning or gritty feeling without itch? Probably dry eye.
- Symptoms peak after screen time? Dry eye.
- Symptoms peak when you walk outside on a high-pollen day? Allergy.
- Both? Very likely both.
Watery eyes go either way. Allergic tearing is inflammatory. Dry-eye tearing is reflex tearing, where the eye floods to make up for a failed baseline tear film, then evaporates again within minutes.
What we do differently in clinic
If artificial tears used four times a day for two weeks have not settled things, come in. Dr. Malani runs a full dry-eye workup that includes meibomian gland imaging, tear osmolarity, and a check for inflammatory markers on the surface. That gives us the actual mechanism, not a guess.
For evaporative dry eye driven by blocked meibomian glands, we have two in-office treatments aimed at the gland structure itself:
- Envision IPL uses pulses of light to calm the inflammation around the lid margin that drives gland dysfunction.
- iLux thermal expression warms and clears the thickened oil that blocks the glands so they can drain again.
For patients whose symptoms are mostly allergy, we switch them off oral antihistamines onto a targeted ophthalmic anti-allergy drop, add a short course of anti-inflammatory drops if needed, and protect the surface with preservative-free tears or a punctal plug. Different mechanism, different plan.
What you can do this week
- Run a humidifier in the bedroom. Frisco indoor humidity often drops into the twenties during spring.
- Switch to preservative-free artificial tears if you are using them more than twice a day.
- Rinse lids with a warm compress at night to clear pollen and oil buildup.
- If you wear contacts, use daily disposables during allergy season so allergens do not accumulate.
- Wear wraparound sunglasses outdoors to block pollen from blowing into the eye.
None of this is a substitute for a proper exam, but it buys you something to work with. If symptoms come back every spring or never fully clear, schedule a dry eye evaluation. We will sort out which problem is driving your symptoms and treat the actual cause.