The Eyelids are very important for protecting the surface of your eyes,and spreading tears.
Conditions on the eyelids may cause poor functioning due to cysts or lid lumps, laxity of the lids causing them to turn in or turn out, ingrowing eye lashes and heavy upper lid skin restricting your visual field.
Dry eyes may cause a decrease in visual quality, dry gritty feeling,burning and paradoxical watering.There are a range of treatments for this,depending on the cause.
The most common reason is Blepharitis, which may benefit from regular cleaning of the Eye lid margins with Blephex
If there are insufficient tears, punctal plugs can be useful, in which a small silicone plug maintains the tears that you do produce on the surface of your eye.