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On buying a telescope for videolaryngoscopy
Author(s) -
Painter Colin,
Komiyama Sohtaro
Publication year - 1987
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-198706000-00025
Subject(s) - telescope , optics , lens (geology) , physics , focal length , zoom lens , eyepiece , field of view , computer science
The purpose of this article is to compare aspects of the performance of three widely‐used rigid laryngoscopy telescopes. The Nagashima SFT‐I, Wolf 4450.57, and Karl Storz 8702 D were used with a JVC GX‐N8U camera and Panasonic PV 8600 VCR to make recordings of a one‐tenth‐inch grid at various distances between the lens and the grid and at two telescope holding angles. Measurements were made of the anteroposterior and mediolateral viewing fields at all distances and holding angles on maximum and minimum zoom. The telescopes were compared for viewing field, lens angle effects, holding angle effects, plane distortion effects, effects due to lens distance, color, edge definition, focus control, light source compatibility, stroboscopic use, cross‐sectional diameter, fogging, and cost. An overview enables laryngologists to assess their needs before buying.