Liu Zhuolin, Kocaoglu Omer P, Miller Donald T
Program in Vision Science, Indiana University, 800 East Atwater Avenue, Bloomington, IN 47405, USA.
School of Optometry, Indiana University, 800 East Atwater Avenue, Bloomington, IN 47405, USA.
Biomed Opt Express. 2013 Nov 26;4(12):3007-29. doi: 10.1364/BOE.4.003007. eCollection 2013.
Adaptive optics (AO) ophthalmoscopes have garnered increased clinical and scientific use for imaging the microscopic retina. Unlike conventional ophthalmoscopes, however, AO systems are commonly designed with spherical mirrors that must be used off-axis. This arrangement causes astigmatism to accumulate at the retina and pupil conjugate planes, degrading AO performance. To mitigate this effect and more fully tap the benefit of AO, we investigated a novel solution based on toroidal mirrors. Derived 2(nd) order analytic solutions along with commercial ray tracing predict performance benefit of toroidal mirrors for ophthalmoscopic use. For the Indiana AO ophthalmoscope, a minimum of three toroids is required to achieve performance criteria for retinal image quality, beam displacement, and beam ellipticity. Measurements with fabricated toroids and retinal imaging on subjects substantiate the theoretical predictions. Comparison to off-the-plane method is also presented.
自适应光学（AO）检眼镜在用于对微观视网膜成像方面，已在临床和科研领域获得了更多应用。然而，与传统检眼镜不同，AO系统通常采用必须离轴使用的球面镜进行设计。这种布置会导致散光在视网膜和瞳孔共轭平面累积，从而降低AO性能。为减轻这种影响并更充分地利用AO的优势，我们研究了一种基于环形镜的新解决方案。通过二阶解析解以及商业光线追迹得出的结果预测了环形镜用于检眼镜时的性能优势。对于印第安纳AO检眼镜，至少需要三个环形镜才能达到视网膜图像质量、光束位移和光束椭圆率的性能标准。对制作的环形镜进行的测量以及对受试者的视网膜成像证实了理论预测结果。文中还给出了与离平面方法的比较。
