Summer Eye Care: Protecting Your Eyes From Heat, Sun, Sea and Dust

Summer is good for the soul and often good for the eyes too: more daylight, more outdoor activity and, for children, more time outside, which helps protect against myopia. But the season also brings a concentrated set of challenges. Ultraviolet (UV) radiation is at its peak, swimming pools and the sea expose the eyes to chlorine and salt, heat and wind dry the eye surface, flights and air conditioning add more dryness, and holiday crowds help infections spread.

This guide takes each summer hazard in turn and explains practical, evidence-based ways to keep your eyes comfortable and safe, whether you are on a beach, on a hiking trail or working in a city heatwave.

UV radiation: the main summer threat

Ultraviolet radiation is invisible, but it affects the eyes in both the short and long term. The UV Index, published daily by weather services, indicates how strong UV is. According to the World Health Organization, protection is recommended when the UV Index is 3 or higher, which in many countries is true for much of the day in summer.

Short-term effects

Intense UV exposure over a few hours can cause photokeratitis, essentially a sunburn of the cornea. Symptoms appear several hours later and include pain, a gritty feeling, watering, light sensitivity and blurred vision. It usually heals within one to two days but is very uncomfortable. It is common after skiing without goggles but can also occur after a long day on the water or beach. Our article on snow blindness and UV damage explains this in detail.

Long-term effects

Cumulative UV exposure over many years is linked to:

• Cataract: UV-B exposure is an established risk factor for some types of cataract.
• Pterygium and pinguecula: fleshy or yellowish growths on the white of the eye, strongly associated with outdoor sun exposure, especially in sunny, windy, sandy environments.
• Eyelid skin cancers: the eyelids are a common site for basal cell carcinoma.

The evidence for UV as a cause of macular degeneration is less clear, but protecting your eyes from excessive light is sensible. People who spend many hours outdoors for work, such as farmers, builders, lifeguards and fishermen, accumulate the most exposure and benefit most from consistent protection. Certain medications can also make the eyes and skin more sensitive to light, so check the leaflet of any new medicine you start before a sunny holiday.

Sunglasses and hats: your best defence

Good sunglasses are the single most effective summer eye-care purchase. What matters most is UV protection, not price or how dark the lens is.

A dark lens without UV filtering can be worse than none, because it widens the pupil and lets more UV in. Children's eyes transmit more UV to the retina than adult eyes, so children need good sunglasses and hats too. For a full guide, see how to choose sunglasses that truly protect.

A wide-brimmed hat, at least 7 to 8 cm, can block a substantial amount of UV reaching the eyes from above. Combined with sunglasses, it offers the best protection. Avoid looking at the sun directly, and never watch a solar eclipse without certified eclipse glasses.

Chlorine, salt water and your eyes

Red, stinging eyes after swimming are common. In pools, the irritation is often caused not by chlorine itself but by chloramines, compounds formed when chlorine reacts with sweat, urine and other contaminants brought in by swimmers. In the sea, salt and sand irritate the eye surface and wash away the protective tear film.

• Wear well-fitting swimming goggles; prescription goggles are available if you need vision correction.
• Rinse your eyes and face with clean, fresh water after swimming.
• Use preservative-free lubricating drops if your eyes feel dry afterwards.
• Avoid rubbing your eyes, which spreads irritants and germs.
• Shower before swimming to reduce pool contamination for everyone.

Our dedicated article on swimming and your eyes goes into goggles, contact lenses and open-water risks in more depth.

Heat, dehydration and dry eye

Hot weather can be surprisingly hard on the tear film. Higher temperatures and wind speed up evaporation, dust and pollen add irritants, and air conditioning removes moisture from indoor air. Dehydration may also reduce tear production in some people.

Symptoms of dry eye include burning, grittiness, redness, a feeling of something in the eye, fluctuating vision and, paradoxically, watering. If you already have dry eye disease, summer can trigger flares.

• Drink water regularly throughout the day, especially in heat and during exercise.
• Wear wraparound sunglasses outdoors to shield your eyes from wind and dust.
• Do not let car vents or air-conditioning units blow directly at your face.
• Use a humidifier in air-conditioned bedrooms if your eyes feel dry in the morning.
• Keep preservative-free artificial tears on hand; our guide on choosing artificial tears can help.
• Blink fully, especially while reading or using screens on holiday.

Dust, sand and foreign bodies

Windy beaches, dusty paths and gardening can send particles into the eye. If something gets in:

1. Do not rub your eye.
2. Blink several times; tears may wash it out.
3. Rinse with clean water or sterile saline, tilting your head so water flows away from the other eye.
4. Lift the upper lid over the lower lid to help sweep particles out.
5. If the feeling persists, vision is blurred, or the particle was propelled at speed (for example by a strimmer or mower), seek medical attention.

Air travel and road trips

Aircraft cabin air is very dry, often well below typical indoor humidity. Combined with watching screens and sleeping upright, long flights commonly cause dry, tired eyes.

• Consider wearing glasses rather than contact lenses on long flights.
• Use lubricating drops during the flight; single-dose vials are convenient and preservative-free.
• Use an eye mask to sleep, and turn off the overhead air vent if it blows on your face.
• Pack eye medications and spare glasses in your hand luggage.
• On long drives, wear polarised sunglasses for glare and take breaks every two hours.

More travel tips are in our article on protecting your eyes on flights and trips.

Conjunctivitis outbreaks in summer

Viral conjunctivitis spreads easily wherever people gather closely: summer camps, holiday resorts, swimming pools, crowded transport and festivals. It causes red, watery, gritty eyes, often starting in one eye and spreading to the other. Allergic conjunctivitis also peaks in pollen season and causes itching, watering and swollen lids. Learn more in our guide to conjunctivitis (pink eye).

• Wash your hands often with soap and water, especially before touching your face.
• Don't share towels, pillows, goggles or eye makeup.
• Avoid swimming while you have conjunctivitis to protect others.
• For allergies, wear sunglasses outdoors, keep windows closed during high pollen times and rinse your face after being outside.

Summer checklist

When to see a doctor

See a pharmacist, optometrist or doctor if red eyes persist for more than a few days, if you have recurrent dryness, or if you notice a new growth on the white of the eye or a change on the eyelid skin that does not heal.

With good sunglasses, a hat, goggles, plenty of water and simple hygiene, you can enjoy everything summer offers while keeping your eyes comfortable and protected for the long term.