Comparison of subfoveal choroidal structures in typical neovascular age-related macular degeneration and polypoidal choroidal vasculopathy
To evaluate and compare the intrachoroidal structures of eyes with typical neovascular age-related macular degeneration (AMD) with those of eyes with polypoidal choroidal vasculopathy (PCV).
Retrospective and comparative case series.
Eighty-four treatment-naïve eyes of 84 patients (22 women and 62 men) with typical neovascular AMD or PCV located in the subfoveal region were studied. Cross-sectional images of the retina and choroid were obtained by swept-source optical coherence tomography (SS-OCT). The horizontal SS-OCT images were analyzed by a manual delineation technique and by a binarization method.
Thirty-nine eyes with typical neovascular AMD and 45 eyes with PCV were studied. Although the subfoveal choroidal thickness (SCT) did not differ significantly between the 2 subtypes (255.1 ± 86.7 µm in typical neovascular AMD and 289.2 ± 116.5 µm in PCV, P = 0.29), the ratio of the large choroidal vessel layer (LCVL) thickness to the SCT was significantly larger in the eyes with PCV than in the eyes with typical neovascular AMD (0.863 ± 0.084 vs 0.803 ± 0.125, P = 0.023). The binarization method did not find significant differences in the choroidal structure between the 2 subtypes. Multivariate logistic regression analyses found the ratio of the LCVL thickness to the SCT to be the only significantly different factor between typical neovascular AMD and PCV (P = 0.035).
The intrachoroidal structures of typical neovascular AMD and PCV eyes differ significantly. In eyes with PCV, there seemed to be a greater dilation of the large choroidal vessels.
KeywordsAge-related macular degeneration Choroidal structure Choroidal vasculopathy Optical coherence tomography Polypoidal choroidal thickness
The authors thank Yuji Yamamoto, Department of Ophthalmology, Kyoto Prefectural University of Medicine, for statistical expertise. This study was supported in part by grant no. 25670739 from the Ministry of Education, Culture, Sports, Science and Technology-Japan (Dr. Koizumi).
Conflicts of interest
Y. Takahashi, None; H. Koizumi, Grant (Novartis), Moderator fees (Alcon, Bausch + Lomb, Bayer, Canon, HOYA, Kowa, NIDEK, Novartis, Santen, Senju, Topcon, Wakamoto); T. Hasegawa, Moderator fees (Alcon, Bayer, Kowa, Novartis, Santen, Senju); T. Izumi, None; I. Maruko, Moderator fees (Alcon, Bayer, NIDEK, Novartis, Santen, Senju, Topcon); S. Sonoda, None; T. Sakamoto, Grant (HOYA, Kowa, Novartis, Senju, Wakamoto), Consultant fees (Bausch + Lomb, Bayer, Novartis, Wakamoto), Moderator fees (Alcon, Kowa, Novartis, Pfizer, Santen, Senju); T. Iida, Grant (NIDEK, Novartis, Santen), Moderator fees (Bayer, Novartis, Santen).