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BioMed Research International
Volume 2013 (2013), Article ID 585729, 6 pages
http://dx.doi.org/10.1155/2013/585729
Clinical Study

Long-Term Effects of Nilvadipine against Progression of the Central Visual Field Defect in Retinitis Pigmentosa: An Extended Study

1Department of Ophthalmology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan
2Department of Ophthalmology, Sapporo Medical University, S1W17, Chuo-ku, Sapporo 060-8556, Japan

Received 17 August 2013; Revised 24 September 2013; Accepted 27 September 2013

Academic Editor: Atsushi Mizota

Copyright © 2013 Mitsuru Nakazawa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To assess the long-term effects of nilvadipine on the progression of central visual field defect in retinitis pigmentosa (RP). Methods. Patients with RP were randomly divided into a treated group receiving oral nilvadipine and a control group. Progression of RP was evaluated with MD slope and the average sensitivity of the central 2° (ΔCENT4). Results. The mean MD slopes were −0.55/−0.39 (right/left eyes, ) dB/year in the treated group and −1.37/−1.15 (right/left eyes, ) dB/year in the control group ( , resp.). In both eyes, however, no statistical difference was observed between the two groups for the ΔCENT4 values. Conclusion. Although we confirmed that nilvadipine significantly retarded the progression of the average of MD value defects in the central 10°, it was not specific for the central 2° of the visual field in RP.