Diniz Filho Alberto, Cronemberger Sebastião, Ferreira Dollores Martins, Mérula Rafael Vidal, Calixto Nassim
School of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Arq Bras Oftalmol. 2010 Mar-Apr;73(2):155-60. doi: 10.1590/s0004-27492010000200011.
To investigate, through ultrasound biomicroscopy images, the presence of plateau iris configuration in eyes with narrow-angle from patients with open-angle glaucoma and in eyes with previous acute primary angle-closure and compare the biometric features of eyes with plateau iris configuration with those of normal eyes.
Ultrasound biomicroscopic images from 196 patients with open-angle glaucoma and narrow-angle and 32 patients with acute primary angle-closure were retrospectively analyzed. The inclusion and specific criteria for the diagnosis of plateau iris configuration was the presence of an anterior positioning of the ciliary processes, supporting the peripheral iris so that it was parallel to the trabecular meshwork; the iris root had a steep rise from its insertion point, followed by a downward angulation from the corneoscleral wall; presence of a central flat iris plane; an absent (complete plateau iris configuration) or partially absent (incomplete plateau iris configuration) ciliary sulcus. The ultrasound biomicroscopic parameters were compared between complete and incomplete plateau iris configuration. The same parameters of both groups were compared with those of normal eyes. The following measurements were performed: anterior chamber depth; angle opening distance at 500 microm from the scleral spur; peripheral iris thickness at 500 microm from the scleral spur; iris-ciliary process distance; trabecular-ciliary process distance and angle recess area.
Plateau iris configuration was found in 33 eyes of 20 (10.2%) out of 196 patients with open-angle glaucoma and narrow-angle and in 4 eyes of 2 (6.3%) out of 32 patients with acute primary angleclosure. Seventeen (77.3%) patients with plateau iris configuration were female and 5 (22.7%) male. Twenty-three (62.2%) out of 37 eyes had complete plateau iris configuration, and 14 (37.8%) had incomplete plateau iris configuration. Complete and incomplete plateau iris configuration presented similar biometric features with the exception of the iris-ciliary process distance. All plateau iris configuration eyes showed biometric parameters completely different from those of normal eyes except for peripheral iris thickness at 500 microm from the scleral spur.
Plateau iris configuration was present in 10.2% of patients with open-angle glaucoma and narrow-angle and in 6.3% of patients with acute primary angle-closure. Biometric features were similar in eyes with complete and incomplete plateau iris configuration with the exception of iris-ciliary process distance. Compared to normal eyes, all plateau iris configuration eyes showed biometric parameters completely different except for peripheral iris thickness at 500 microm from the scleral spur.
通过超声生物显微镜图像，研究开角型青光眼合并窄角患者及既往有急性原发性闭角型青光眼患者眼中高原虹膜形态的存在情况，并比较有高原虹膜形态的眼睛与正常眼睛的生物特征。
回顾性分析196例开角型青光眼合并窄角患者及32例急性原发性闭角型青光眼患者的超声生物显微镜图像。诊断高原虹膜形态的纳入及具体标准为：睫状体向前移位，支撑周边虹膜使其与小梁网平行；虹膜根部从附着点急剧上升，随后从角巩膜壁向下倾斜；存在中央平坦的虹膜平面；睫状沟缺失（完全性高原虹膜形态）或部分缺失（不完全性高原虹膜形态）。比较完全性和不完全性高原虹膜形态的超声生物显微镜参数。将两组的相同参数与正常眼睛的参数进行比较。进行以下测量：前房深度；距巩膜突500微米处的房角开放距离；距巩膜突500微米处的周边虹膜厚度；虹膜 - 睫状体距离；小梁 - 睫状体距离和房角隐窝面积。
在196例开角型青光眼合并窄角患者中，20例（10.2%）的33只眼中发现有高原虹膜形态；在32例急性原发性闭角型青光眼患者中，2例（6.3%）的4只眼中发现有高原虹膜形态。有高原虹膜形态的患者中，17例（77.3%）为女性，5例（22.7%）为男性。37只眼中，23只（62.2%）有完全性高原虹膜形态，14只（37.8%）有不完全性高原虹膜形态。除虹膜 - 睫状体距离外，完全性和不完全性高原虹膜形态表现出相似的生物特征。所有有高原虹膜形态的眼睛，除距巩膜突500微米处的周边虹膜厚度外，其生物参数均与正常眼睛完全不同。
开角型青光眼合并窄角患者中10.2%存在高原虹膜形态，急性原发性闭角型青光眼患者中6.3%存在高原虹膜形态。除虹膜 - 睫状体距离外，完全性和不完全性高原虹膜形态的眼睛生物特征相似。与正常眼睛相比，所有有高原虹膜形态的眼睛除距巩膜突500微米处的周边虹膜厚度外，其生物参数均完全不同。
