It is the hottest summer on record. Your AC is on full blast.

The Weekly Eye-Opener 
Introducing our New Weekly Series by our Lead Optometrist, Dhruvin Patel

It Is the Hottest Summer on Record. Your AC Is on Full. And Your Eyes Are Having the Worst Week of the Year.

You already know this summer is different.

The heat outside is relentless. Every office and home has the air conditioning on full blast. And quietly, without most people noticing, your eyes are getting wrecked.

Not from the heat alone. Not from the AC alone. From the combination of both, plus the screen you have been staring at all day.

That gritty, heavy, scratchy feeling you have been ignoring since around 2pm? It has a name. And July is officially the month the clinical community has set aside to talk about it.

What the research has measured

During screen use, blink rate drops by more than 50%, from around 15 times per minute to as low as 5. Every missed blink is another moment your eye surface goes unprotected and the tear film breaks down.

(Chai Y et al., Scientific Reports, 2025)

Dry eye has more than doubled in children since the pandemic, rising from 6–10% to 20–25%. The primary cause in all age groups is the same: too many hours on screens, blinking too infrequently.

(Venugopal and Bhaskar, 2025)

Dry eye now affects up to 16 million people — and that number keeps rising. Hot weather, air conditioning, and prolonged screen use are all listed by the clinical community as direct contributors. This summer all three are happening at the same time.

(AJMC, July 2026 / Prevent Blindness, 2026)

💡 This is the core research insight

Your eyes are protected by a tear film, three thin layers of moisture that refresh with every blink. On a screen, you stop blinking properly. In an air-conditioned room, the moisture in the air drops. In a heatwave, hot dry air accelerates evaporation even further. Each factor alone is a dry eye trigger. All three together, on the same afternoon, on the same screen, in the same overheating office or home, is exactly the combination that turns a manageable discomfort into a properly miserable second half of the working day.

The good news is that every single one of these triggers is something you can do something about.

The bigger picture

Prevent Blindness declared July Dry Eye Month because the clinical community is concerned, not just about the physical discomfort, but about the knock-on effects on quality of life, mental health, and productivity. This year that declaration landed in the middle of the hottest summer on record. If you have been ignoring the signs, this week is a very good time to stop.