A healthy tear film ensures that your eyes don’t dry out and you can see sharply at all times. The lower layer, a thin layer of oil, is produced by the meibomian glands and protects the tears against evaporation. If these glands produce too little oil, your tears can easily dry up and you can experience blurred vision, or tired or tearing eyes. An Omega 3 food supplement (fish oil) can help. It increases the quantity of oil and improves the quality of the oil produced by the meibomian glands.