A optical design of confocal scanning laser ophthalmoscope based on Chinese eye model is presented, which is featured by using a Chinese eye model. Firstly, a Chinese eye model, which is obtained by reverse building from Chinese population, is adopted as eye model. Secondly, a famous optical design architecture of confocal scanning laser ophthalmoscope is selected to build our design based on the Chinese eye model. In our design, the illumination light path, the retina imaging light path, and the corneal reflection light path are all implemented. The simulation show that our design has high resolution.
A Hartmann-Shack wavefront sensor is designed for adaptive optics confocal scanning laser ophthalmoscopy. The Hartmann-Shack wavefront sensor designed consists of a lenslet array with square configuration, sub-aperture size 0.2mm×0.2mm , focal length 5mm and a CCD camera with pixel size 3.75μm×3.75μm.Thedynamic range and measurement accuracy of the HSWFS are simulated through the software MATLAB. Theresult of simulation indicates that focus dynamic range±14λ (λ=635nm), wavefront measurement accuracyreach RMS λ/100, all these indicators reached the requirements of the system. Finally, experimentsofcalibration by spherical wavefront were done on these indicators.
We developed a clinical ophthalmic prototype by combining bimorph deformable mirror (DM)-based adaptive optics (AO) with a confocal scanning laser ophthalmoscope. A low-cost bimorph DM with a large stroke of 50 μm and an aperture of 20 mm was utilized to realize a strategy for successive AO control of aberration correction, which permitted open-loop compensation for low-order aberrations and closed-loop correction of high-order aberrations to acceptable root mean square errors of <0.08 μm in all subjects. Spherical mirrors were folded in a nonplanar configuration to minimize off-axis aberrations and provide a compact, cost-effective design, which achieved a diffraction-limited performance capable of imaging individual photoreceptor cells and blood vessels not only in healthy subjects but also in patients suffering from retinitis pigmentosa. The adaptive optics scanning laser ophthalmoscope (AOSLO) images of the diseased retina had much higher resolutions than those captured by the commercial AO fundus camera, and loss of the photoreceptor mosaic could be distinguished more accurately due to the improvement in resolution. The compact design and easy handling of the bimorph DM-based AO control may facilitate the translation of AOSLO into clinical settings, and this prototype development will continue with future device refinement and extensive clinical testing.
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