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O. Seyeddain, M. Hohensinn, G. Grabner, A. K. Dexl; Testing Reading Performance With the Salzburg Reading Desk (SRD) After Implantation of the AcuFocusTM 7000 Corneal Inlay (ACI) in Presbyopic Patients. Invest. Ophthalmol. Vis. Sci. 2008;49(13):1800.
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© ARVO (1962-2015); The Authors (2016-present)
The determination of Reading Performance (RP) is still the most important clinical examination, whenever the potential benefits of surgical procedures for the correction of presbyopia are compared. The bilateral RP with a new, standardized device (SRD) in 15 patients before, and within 1 year after implantation of the ACI in the non dominant eye of presbyopic patients, has been investigated. This is a 10 micron thin, intracorneal implant with a central aperture of 1.6 mm and an outside diameter of 3.8 mm, with nutritional micropores, designed to improve RA.
Based on the "Radner-Reading-Charts", the SRD was developed for testing reading acuity (RA) under standardized illumination. As measuring RA with fixed distance does not allow to draw conclusions on the "every day reading ability" of patients, the continuously changing reading distance (RD) is monitored by stereo-photometry, and is mathematically taken into consideration. The reading angle, as an additional variable parameter, can be chosen freely by the patient, to offer the most convenient test circumstances. Bilateral RP was examined before and within 1 year after implantation of the ACI.
All implanted eyes showed an increase of RA and had a significant decrease in RD after ACI implantation. The SRD demonstrates that patients achieve an improvement in their everyday RP by "gaining distance". Average RD (cm) improvement after 1 year measured with the SRD: mean 11.9 ± 8.65 (p< 0.0002). The average reading improvement after 1 year obtained with the SRD was a mean 2.2 ± 1.52 lines. Increasing depth of focus after implanting the ACI therefore improves RA by reducing the patients own RD.
The SRD provides objective, valid and comparable results as far as the true "reading abilities" of trial subjects are concerned. It can be demonstrated that the ACI significantly improves RA in presbyopic patients.A newly developed "SRD-advanced" (with a high-resolution monitor, which offers the additional possibility to test with different contrast levels), will in the near future allow to obtain even more detailed information on the "every day reading ability" of patients after any type of presbyopic surgery. Studies testing RA following a variety of surgical methods e.g. the implantation of multifocal IOL's are currently under way in different European centers with the use of the SRD in order to confirm the potential of this highly refined method for RA evaluation.
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