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J. S. Wolffsohn, L. N. Davies, N. Gupta, S. A. Naroo, G. A. Gibson, S. Shah; Two-Year Performance of the Tetraflex KH3500 ‘Accommodative’ Intraocular Lens. Invest. Ophthalmol. Vis. Sci. 2008;49(13):5277.
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© ARVO (1962-2015); The Authors (2016-present)
To determine the two year performance of eyes implanted with the Tetraflex (Lenstec, Kellen KH-3500) ‘accommodative’ intraocular lens (IOL).
Thirty-seven patients who had been implanted with the Tetraflex ‘accommodating’ IOL at least two years previously, 19 binocularly, were assessed. Outcome measures were refraction, visual acuity, contrast sensitivity, subjective and objective amplitude-of-accommodation, aberrometry and capsule opacification.
The average time since implantation of the Tetraflex lens was 2.64 ± 0.32 years. Best-corrected distance acuity was +0.04 ± 0.24 logMAR, contrast sensitivity +1.35 ± 0.21 log units and best distance-corrected near acuity was 0.61 ± 0.17 logMAR. The subjective amplitude-of-accommodation was 1.53 ± 0.64 D, subjective range-of-clear-focus 0.77 ± 0.29 D and objective amplitude-of-accommodation was 0.21 ± 0.19 D. The magnitude of higher order aberrations was 0.96 ± 1.26 microns through 4 mm pupils. Twenty-three eyes (48%) had already received or were waiting for a YAG capsulotomy. Binocular implantation resulted in improved contrast sensitivity and best distance-corrected near visual acuity than the monocularly viewing better eye (p<0.001). The improvement in binocular over monocular subjective amplitude-of-accommodation was predictable from the monocular measurement (p<0.001).
The Tetraflex ‘accommodating’ IOL maintains a small objective accommodating effect and reasonable subjective focusing range over two years post-implantation, although posterior capsular opacification was common.
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