[Modern principles of endonasal surgery on the lacrimal duct].

Intranasal operations on the lacrimal duct developed in 1910 by G. West are rarely used now. The author analyzes his experience gained in 5000 endonasal dacryocystorhinostomies (96.7% of which were effective) and the advantages of intranasal approach to the lacrimal duct and presents a working classification of dacryocystitis. Indications for endonasal surgery on the lacrimal duct and contraindications precluding it are defined and a table for selecting the appropriate intranasal intervention in cases with abnormal discharge of tears offered. The author emphasizes the efficacy of endonasal operations and advocates wide use of this method in dacryology.