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O. Seyeddain, H. Schlögel, M. Wolfbauer, G. Grabner, A. K. Dexl; Salzburg Reading Desk vs. Optec®6500P VT -Comparing Near Visual Acuity After Implantation of the AcufocusTM ACI 7000 in Presbyopic Patients. Invest. Ophthalmol. Vis. Sci. 2007;48(13):977.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the bilateral reading performance with a new device ("Salzburg Reading Desk-SRD") versus a common method (Optec® 6500P Vision Tester - OVT) in 15 patients before and 3 months after implantation of the AcuFocusTM ACI 7000 (ACI) in the non dominant eye
The SRD is a newly developed, semi-automated objective device for evaluating near visual acuity (NVA) (= reading acuity, reading speed and critical print size) under standardized illumination. The reading distance - the by far most critical parameter in testing NVA - seems to be very variable for every patient tested, whenever the trial subjects are allowed to freely choose a subjectively convenient distance. Therefore measuring NVA with a fixed distance does not allow to draw conclusions on the "every day reading ability" of the patient. The SRD continuously monitors the changing reading distance by stereo-photometry, using two ip-cameras, which is then mathematically taken into consideration for the calculations of the reading parameters. In comparison, the OVT, complying with ANSI standards, has a fixed examination distance (40cm) and reading angle for testing NVA without gathering information about the everyday reading ability of the patient. Patients were examined before and 3 months after implantation of the ACI, which is a thin, micro-perforated artificial aperture to restore NVA in presbyopic patients.
All implanted eyes showed an increased NVA.Results obtained with the OVT showed better NVA results in all patients: pre-OP:mean: 0,32sc Snellen Equivalent (SnE) post-OP mean: 0,78sc SnE. In contrast the SRD shows the results patients achieve in their everyday reading performance: pre-OP: mean: 0,54sc SnE (mean distance:49,1cm)post-OP: mean: 0,56sc SnE (mean distance:43,6cm).
Both devices clearly show a significant improvement of NVA postoperatively. Whereas with the OVT only the "pure" Snellen-NVA can be tested, the SRD seemingly provides objective, valid and comparable results as far as the true "reading abilities" of trial subjects are concerned.It seems that the ACI has a significant impact on the improvement of NVA in presbyopic patients. Further studies are warranted and under way to evaluate the results achieved with the SRD in comparison to other conventional NVA testing methods following different surgical techniques for the correction of presbyopia.
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