Lucente Amedeo, Taloni Andrea, Scorcia Vincenzo, Giannaccare Giuseppe
Private Practice, Studio Lucente, 87012 Castrovillari, Italy.
Department of Ophthalmology, University "Magna Græcia", 87012 Catanzaro, Italy.
Life (Basel). 2023 Jan 10;13(1):202. doi: 10.3390/life13010202.
Diabetic retinopathy (DR) often causes a wide range of lesions in the peripheral retina, which can be undetected when using a traditional fundus camera. Widefield (WF) and Ultra-Widefield (UWF) technologies aim to significantly expand the photographable retinal field. We conducted a geometrical analysis to assess the field of view (FOV) of WF and UWF imaging, comparing it to the angular extension of the retina. For this task, we shot WF images using the Zeiss Clarus 500 fundus camera (Carl Zeiss Meditec, Jena, Germany). Approximating the ocular bulb to an ideal sphere, the angular extension of the theoretically photographable retinal surface was 242 degrees. Performing one shot, centered on the macula, it was possible to photograph a retinal surface of ~570 mm, with a FOV of 133 degrees. Performing four shots with automatic montage, we obtained a retinal surface area of ~1100 mm and an FOV of 200 degrees. Finally, performing six shots with semi-automatic montage, we obtained a retinal surface area of ~1400 mm and an FOV of 236.27 degrees, which is close to the entire surface of the retina. WF and UWF imaging allow the detailed visualization of the peripheral retina, with significant impact on the diagnosis and management of DR.
糖尿病性视网膜病变（DR）常在外周视网膜引发多种病变，使用传统眼底相机时这些病变可能无法被检测到。广角（WF）和超广角（UWF）技术旨在显著扩大可拍摄的视网膜视野。我们进行了一项几何分析，以评估WF和UWF成像的视野（FOV），并将其与视网膜的角扩展进行比较。对于此任务，我们使用蔡司Clarus 500眼底相机（德国耶拿卡尔蔡司医疗技术公司）拍摄WF图像。将眼球近似为一个理想球体，理论上可拍摄的视网膜表面的角扩展为242度。以黄斑为中心进行一次拍摄，可以拍摄到约570平方毫米的视网膜表面，视野为133度。通过自动拼接进行四次拍摄，我们获得了约1100平方毫米的视网膜表面积和200度的视野。最后，通过半自动拼接进行六次拍摄，我们获得了约1400平方毫米的视网膜表面积和236.27度的视野，这接近视网膜的整个表面。WF和UWF成像能够详细显示外周视网膜，对DR的诊断和管理有重大影响。
