Mechanism of action of the tetraflex accommodative intraocular lens


PURPOSE:To investigate the mechanism of action of the Tetraflex (Lenstec Kellen KH-3500) accommodative intraocular lens (IOL). METHODS:Thirteen eyes of eight patients implanted with the Tetraflex accommodating IOL for at least 2 years underwent assessment of their objective amplitude-of-accommodation by autorefraction, anterior chamber depth and pupil size with optical coherence tomography, and IOL flexure with aberrometry, each viewing a target at 0.0 to 4.00 diopters of accommodative demand. RESULTS:Pupil size decreased by 0.62+/-0.41 mm on increasing accommodative demand, but the Tetraflex IOL was relatively fixed in position within the eye. The ocular aberrations of the eye changed with increased accommodative demand, but not in a consistent manner among individuals. Those aberrations that appeared to be most affected were defocus, vertical primary and secondary astigmatism, vertical coma, horizontal and vertical primary and secondary trefoil, and spherical aberration. CONCLUSIONS:Some of the reported near vision benefits of the Tetraflex accommodating IOL appear to be due to changes in the optical aberrations because of the flexure of the IOL on accommodative effort rather than forward movement within the capsular bag.

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Divisions: College of Health & Life Sciences > School of Optometry > Optometry
College of Health & Life Sciences > School of Optometry > Optometry & Vision Science Research Group (OVSRG)
College of Health & Life Sciences
College of Health & Life Sciences > School of Optometry > Vision, Hearing and Language
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Uncontrolled Keywords: Tetraflex,Lenstec Kellen,KH-3500,accommodative intraocular lens,IOL,Ophthalmology,Surgery
Publication ISSN: 1938-2391
Last Modified: 08 May 2024 07:08
Date Deposited: 15 Apr 2010 13:12
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.jour ... asp?thing=60050 (Publisher URL)
PURE Output Type: Article
Published Date: 2010-11-01
Accepted Date: 2010-01-15
Authors: Wolffsohn, James S.W. (ORCID Profile 0000-0003-4673-8927)
Davies, Leon N. (ORCID Profile 0000-0002-1554-0566)
Gupta, Navneet
Naroo, Shehzad A. (ORCID Profile 0000-0002-6373-7187)
Gibson, George A.
Mihashi, Toshifumi
Shah, Sunil (ORCID Profile 0000-0002-5373-5305)



Version: Accepted Version

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