González-Saldivar Gerardo, Chow David R
Ophthalmic Surg Lasers Imaging Retina. 2020 Apr 1;51(4):S15-S21. doi: 10.3928/23258160-20200401-02.
Evaluate depth of field (DOF) and lateral resolution (LR) on digitally assisted vitreoretinal surgery (DAVS) with different camera aperture values and TV viewing distances to determine maximal optical performance.
Five retinal surgeons objectively evaluated DOF and LR at low (10×), medium (15×), and high (20×) magnification on a conventional microscope (CM) and DAVS. DAVS was evaluated at different camera apertures (30%, 50%, and 75%) and TV viewing distances (1.2 meters [m], 1.5 m, and 2.0 m). A comparison between CM and optimized DAVS values was carried out.
On DAVS, DOF significantly increased as camera aperture size was reduced (75% to 50%, P = .022; 75% to 30%, P ≤ .001; and 50% to 30%, P = .001) and as microscope magnification was reduced (high to medium, P = .009; high to low, P ≤ .001; and medium to low, P = .002). LR significantly increased as microscope magnification was increased (low to medium, P = .010; low to high, P ≤ .001; and medium to high, P = .015) and as TV display distance decreased (2.0 m to 1.5 m, P = .019; 2.0 m to 1.2 m, P = .009; and 1.5 m to1.2 m, P = .185). When comparing optimized DAVS against CM, DOF was significantly larger on DAVS (P = .019). LR on DAVS outperformed the CM, but statistical significant was not reached (P = .185).
The authors' study is the first to evaluate different aperture, magnification, and TV distance settings, and when optimized, DAVS can significantly outperform a CM with respect to DOF and LR. Optimized visual performance for DAVS is obtained with a 30% camera aperture and a TV viewing distance no further than 1.5 m. Maximal microscope magnification to exploit LR during macular surgery and low-to-medium magnification to increase DOF for overall vitrectomy surgery is recommended. [Ophthalmic Surg Lasers Imaging Retina. 2020;51:S15-S21.].
评估在不同摄像头光圈值和电视观看距离下数字辅助玻璃体视网膜手术（DAVS）的景深（DOF）和横向分辨率（LR），以确定最大光学性能。
五位视网膜外科医生在传统显微镜（CM）和DAVS上，分别在低倍（10×）、中倍（15×）和高倍（20×）放大倍数下客观评估DOF和LR。在不同的摄像头光圈（30%、50%和75%）和电视观看距离（1.2米、1.5米和2.0米）下对DAVS进行评估。对CM和优化后的DAVS值进行比较。
在DAVS上，随着摄像头光圈尺寸减小（75%至50%，P = 0.022；75%至30%，P≤0.001；50%至30%，P = 0.001）以及显微镜放大倍数降低（高倍至中倍，P = 0.009；高倍至低倍，P≤0.001；中倍至低倍，P = 0.002），DOF显著增加。随着显微镜放大倍数增加（低倍至中倍，P = 0.010；低倍至高倍，P≤0.001；中倍至高倍，P = 0.015）以及电视显示距离减小（2.0米至1.5米，P = 0.019；2.0米至1.2米，P = 0.009；1.5米至1.2米，P = 0.185），LR显著增加。将优化后的DAVS与CM进行比较时，DAVS的DOF显著更大（P = 0.019）。DAVS的LR优于CM，但未达到统计学显著性（P = 0.185）。
作者的研究首次评估了不同光圈、放大倍数和电视距离设置，并且优化后，DAVS在DOF和LR方面可显著优于CM。DAVS在摄像头光圈为30%且电视观看距离不超过1.5米时可获得优化的视觉性能。建议在黄斑手术中使用最大显微镜放大倍数以利用LR，在整体玻璃体切除手术中使用低至中倍放大倍数以增加DOF。[《眼科手术、激光与视网膜成像》。2020；51：S15 - S21。]
