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S. Mantry, O. Hunt, J.S. Wolffsohn, B. Gilmartin, M.T. Benson, I.A. Cunliffe, S. Shah; Static and dynamic ‘accommodation’ with 1CU Intra Ocular Lenses . Invest. Ophthalmol. Vis. Sci. 2004;45(13):2190.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To determine the subjective and objective accommodation of eyes implanted with the 1CU accommodative intra–ocular lenses (IOL). Method: Twelve subjects, 20 eyes (33 – 78 years, average 60.7 ± 15.4 years, 3 M, 9 F), with a 1CU accommodative intra–ocular lens implanted in one or both eyes had a full binocular refraction at 6m and both distance and near acuity was measured with a logMAR chart. Subjects were made functionally emmetropic with soft contact lenses. Subjective amplitude of accommodation was measured with the RAF rule. The objective accommodative stimulus–response curve for static (Maltese Cross) targets (matched for angular subtense) was measured using the Shin Nippon SRW–5000. The subjects viewed the targets monocularly, in random order, at 0.17, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00 and 4.00D accommodative demand. Continuous objective recording of dynamic accommodation was measured with the SRW–5000 with the subject viewing a target moving from 0 to 2.50D at 0.3 Hz through a Badal lens system. Wavefront aberrometry measures were made through undilated pupils using the Zywave. Results: The best corrected acuity was –0.01 ± 0.16logMAR at distance and 0.60 ± 0.09logMAR at near. Subjective amplitude of accommodation was 2.24 ± 0.42D. Objectively the static amplitude of accommodation was 0.72 ± 0.38D, although individual responses varied greatly. The average dynamic amplitude of accommodation was 0.71 ± 0.47D with a lag behind the target of 0.50 ± 0.48s. Aberrometry showed a decrease in power of the lens–eye combination from the centre to the periphery in all subjects, on average –0.38 ± 0.28D/mm. Conclusion: The objective accommodating effects of the 1CU lens appear to be limited, although patients are able to track a moving target. The greater subjective amplitude of accommodation is likely to result from the eyes depth of focus of and the aspheric nature of the IOL.
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