gms | German Medical Science

22nd International Congress of German Ophthalmic Surgeons

18. to 21.06.2009, Nürnberg

Video endoscopic findings of the retropupillary space during the enveloped technique the mechanism of pseudophakic accommodation

Meeting Abstract

Search Medline for

  • Mon-Te Kahn - Mackay Memorial Hospital Affiliated with Taipei Med. Uni., Department of Ophthalmology, Taipei, Taiwan

22. Internationaler Kongress der Deutschen Ophthalmochirurgen. Nürnberg, 18.-21.06.2009. Düsseldorf: German Medical Science GMS Publishing House; 2009. Doc09docWK 1.1

doi: 10.3205/09doc093, urn:nbn:de:0183-09doc0936

Published: July 9, 2009

© 2009 Kahn.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.



Purpose: This study was to visualize the ciliary body and the posterior aspect of the iris during endo-capsular cataract extraction by means of video-endoscope, and to try to elucidate the mechanism involved in accommodation of the pseudophakic eye.

Methods: Eight consecutive endo-capsular cataract extraction were performed. After the intraocular lens had been glided into the capsular bag, an endoscope with endo-illumination was inserted through the corneo-scleral incision to rest upon the optic. The retro-pupillary change could be observed when the pupil was constricted by carbachol, or when the scleral overlying the ciliary body was indented.

Results: Identical video-endoscopic findings were noted in all cases, including the pre-coronary zone, ciliary crown, and ciliary valley. When there came the pupillary constriction or indentation, the ciliary crown became prominently visible.

Conclusions: Pupillary constriction and indentation both appear to stimulate contraction of the ciliary body, so as to exert an even relaxing force upon the arc of the lens capsule. As long as the intraocular lens remains inside the capsular bag, this relaxing force upon the lens capsule elucidates the mechanism of peudophakic accommodation.