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Changes in Focal Macular ERGs after Macular Translocation Surgery with 360° Retinotomy

From the Department of Ophthalmology, Nagoya University School of Medicine, Nagoya, Japan.

PURPOSE. To evaluate the short- and long-term changes of focal macular electroretinograms (fmERGs) after macular translocation with 360° retinotomy.

METHODS. This was a retrospective study. fmERGs were recorded in 19 eyes of 19 consecutive patients who underwent macular translocation with 360° retinotomy for choroidal neovascularization (CNV) secondary to age-related macular degeneration (AMD; 17 eyes) or polypoidal choroidal vasculopathy (2 eyes). The changes in the fmERGs, recorded before, shortly after (6–12 months; mean 8.3 months), and more than 18 months (18–30 months; mean 22.4 months) after surgery from 12 eyes, were analyzed. A 15° stimulus centered on the fovea was used to elicit the fmERGs.

RESULTS. The mean logarithm of minimum angle of resolution (logMAR) was 1.06 ± 0.07 (20/230) before surgery, 0.78 ± 0.08 (20/121) early after surgery (n = 19), and 0.64 ± 0.07 (20/87) late after surgery (n = 12). These improvements in visual acuity were significant (P = 0.0074, P = 0.0050, respectively). Before surgery, the amplitudes of all components of the fmERGs were markedly reduced in all eyes. The mean b-wave amplitude in 17 AMD eyes recorded early after surgery was significantly larger (P = 0.0262), and the mean a-wave amplitude was also increased but not significantly (P = 0.1180). The mean amplitudes of the a- and b-waves in 10 AMD eyes recorded after 18 months were significantly larger than those before the surgery (P = 0.0218, and P = 0.0284). The mean implicit time of the b-wave in 17 AMD eyes decreased early after surgery, and a further decrease was detected at the later testing time.

CONCLUSIONS. These results indicate that macular function is partially recoverable after macular translocation in some patients.

This article has been cited by other articles:

				H. Nishihara, M. Kondo, K. Ishikawa, T. Sugita, C.-H. Piao, Y. Nakamura, and H. Terasaki Focal Macular Electroretinograms in Eyes with Wet-type Age-Related Macular Degeneration Invest. Ophthalmol. Vis. Sci., July 1, 2008; 49(7): 3121 - 3125. [Abstract] [Full Text] [PDF]