Table 1.

Classification of dry eye.

Dry eye
Tear deficient (hyposecretive)		Evaporative (hyperevaporative)
Sjoergen's syndrome	Non-Sjögren's tear deficiency	Intrinsic	Extrinsic
Primary	Lacrimal disease/deficiency	Oil deficient	Topical drug preservatives
Secondary	Lacrimal obstruction	Lid related	Vitamin A deficiency
	Reflex block	Low blink rate	Contact lens related
			Ocular surface change
			Drug related