In some cases, certain foods, such as cow's milk, eggs, fish, shellfish, yeast products, nuts, and some food colourings and preservatives, can make symptoms worse.

BBC: Fast-food 'linked to childhood asthma and eczema'

Some eye experts say omega-3s, found commonly in fish and nuts, appear to play a protective role in eye health with both the retina and cornea.

WSJ: The Crucial Years for Protecting Your Eye Health

Since 2006, food manufacturers have been required to clearly label products that contain any of the most common allergens -- milk, eggs, fish, shellfish, peanuts, tree nuts, wheat and soy -- but some allergy experts say the labels should be more explicit.

CNN: The story