The development of such an intraocular camera (IOC) would eliminate the need for an external head-mounted or eyeglass-mounted camera. The focus of this thesis is on the design and analysis of refractive, diffractive, and hybrid refractive/diffractive lens systems for a miniaturized camera that can be surgically implanted in the crystalline lens sac and is designed to work in conjunction with current and future generation retinal prostheses. Intraocular camera for retinal prostheses: Refractive and diffractive lens systems Eventually, exemplary measurements are presented and discussed. In this contribution, the scan properties and capabilities of the tunable lens in the Hi Lo microscope are analyzed. As the NA of the adaptive lens is only about 0.05, a fixed high-NA lens is included in the setup to provide high resolution. This technique enables a large tuning range of the refractive power between 1/f = (-24. When actuated, the piezo generates a pressure in the lens which deflects the membrane and thus changes the refractive power. A transparent fluid is filled between the membrane and the glass substrate. The used adaptive lens consists of a transparent polydimethylsiloxane (PDMS) membrane into which an annular piezo bending actuator is embedded. We incorporate an electrically tunable lens in the Hi Lo microscope for axial scanning, to obtain three-dimensional data without the need of moving neither the sample nor the objective. Additionally, the depth-of-field is not fixed, but can be adjusted between wide field and confocal-like axial resolution. Hi Lo microscopy combines wide field and speckled illumination images to create optically sectioned images. We present a Hi Lo microscope with an electrically tunable lens for high-contrast three-dimensional image acquisition.
Philipp, Katrin Smolarski, André Fischer, Andreas Koukourakis, Nektarios Stürmer, Moritz Wallrabe, Ulricke Czarske, Jürgen High-contrast 3D image acquisition using Hi Lo microscopy with an electrically tunable lens Image quality and tolerance performance analysis for this lens are also presented. Then, a 9.2- to 16.1-mm F/2.8 to F/3.5 zoom fisheye lens design is presented, including the design approach and aberration control. The history and optical characteristics of fisheye lenses are briefly reviewed. This paper presents a large aperture zoom fisheye lens for DSLR cameras that produces both circular and diagonal fisheye imaging for 35-mm sensors and diagonal fisheye imaging for APS-C sensors. However, photographic fisheye lenses with variable focal length are rare on the market due in part to the greater design difficulty. Photographic fisheye lenses with fixed focal length for cameras with different sensor formats have been well developed for decades. Photographic zoom fisheye lens design for DSLR cameras
0 kommentar(er)
