In a person with normal production, blocking tear drainage would cause the tears to spill over onto the cheek. However, in some dry eye patients with very low tear production, evaporation alone will be enough to prevent this and blocking the tear drainage can be very effective in dry eye relief. Other methods Because tears evaporate like any liquid, taking steps to prevent this can help. For example, in the winter with indoor heat, use a humidifier. Wrap around glasses can reduce drying in a windy environment.
Smoking is especially bothersome.
Blockage of the meibomian glands can reduce the tear film slick and cause increased evaporation. Warm compresses and eyelid scrubs can release these plugs and help normalize the oily layer of the tear film. Vitamin A deficiency can also cause dry eye and results from severe dietary neglect.