Holland and Barrett say: “Taking fish oils may help to ease dry eyes and improve the quality of the tear film, which stops tears evaporating in our eyes.”

Furthermore, they add: “A study published in the Journal of the British Contact Lens Association in 2015 reported that those taking omega-3 fatty acids, found in fish oils, for three months had a decreased tear evaporation rate.”

Vitamin A is also recommended as key to eye health.

In this case vitamin A is used to refer to a group of antioxidant compounds.