Types of dysgenetic dry eye:
(1) defect in aqueous glands (absence or hypoplasia)
(2) defect in lipid glands
(3) defect in mucinic glands
(4) defect in lacrimal ducts
Defects in aqueous glands include:
(1) alacrimia (absence of lacrimal glands)
(2) dysplasia ectodermica anhidrotica
Defects in lipid glands:
(1) first branchial arch syndrome
(2) dysplasia ectodermica anhidrotica
(3) epicanthus-blepharophimosis syndrome
(4) keratopathy-ichthyosis-deafness syndrome
Defects in mucinic glands:
(1) aniridia (absence of iris)
(2) Bietti syndrome
