A system of optical design by Arthur Cox

By Arthur Cox

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3 Challenges to Ophthalmic Adaptive Optics Systems . . . . . . . . . . . . . . . . 4 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction to Adaptive Optics Systems The quality of images provided by an imaging system is affected by imperfections in the optical path of light traveling from the object being imaged to the location of the image.

2 Wavefront Correctors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Retinal Imaging Adaptive Optics Systems . . . . . . . . . . . . . . . . . . . . . . . . . 1 Correction of the Aberrations in the Eye Using AO Systems . . . .

Such a control system thus involves both continuous time and discrete time signals and can be analyzed in a discrete time framework. Usually, two discretization techniques—zero-order hold transformation and bilinear transformation—are used to convert the continuous time system to a discrete time system. Zero-order hold transformation is suitable to discretize the physical plant 20 1 Introduction and Preliminaries Fig. 2 Zero-order hold system y u S G H with a zero-order hold as shown in Fig. 2, where G is the continuous time plant, H and S are hold and sampling devices which are implemented using D/A and A/D converters, respectively.

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