Table 1: Classification of dry eye.

Dry eye
Tear deficient (hyposecretive)Evaporative (hyperevaporative)
Sjoergen’s syndromeNon-Sjögren’s tear deficiencyIntrinsicExtrinsic

PrimaryLacrimal disease/deficiencyOil deficientTopical drug preservatives
SecondaryLacrimal obstructionLid relatedVitamin A deficiency
Reflex blockLow blink rateContact lens related
Ocular surface change
Drug related