Dry air, wind and altitude

Wind and altitude outdoors, air conditioning and central heat indoors — all of it pulls moisture off your eyes faster than you can replace it. So eyes can feel drier with the seasons, and in some places more than others.

Indoors

Heating in winter and air conditioning in summer both dry the air in a room, and offices and hotel rooms run one or the other for hours at a stretch.

Outdoors

Wind speeds up evaporation from the surface of the eye, and higher altitudes bring drier air. A day of skiing or hiking can leave your eyes feeling it, and so can a long drive with the vents blowing toward your face.

What the label covers

Quell’s Uses section reads: For use as a protectant against further irritation or to relieve dryness of the eye. The directions are the same whatever the weather: Apply 1 drop 3 times per day in each eye.

Keeping the bottle in range

Hot cars, cold trunks and sunny windowsills all sit outside the label’s storage range. How to store eye drops covers where to keep it instead.