Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
Lacrimal Center of Ophthalmology the Third Medical Center of Chinese PLA General Hospital Beijing 100039 China;
congenital absence; lacrimal puncta; lacrimal canaliculi; IGSF3 mutation; DNA sequencing;