Design of optical system for stereo imaging fundus camera

Zhi-tao, 肖志涛 Xiao; Shi-liang, 娄世良 Lou; Jun, 吴骏 Wu; Lei, 耿 磊 Geng; Fang, 张芳 Zhang

doi:10.3788/ope.20182605.1054

Cited by 2 publications

(1 citation statement)

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“…The imaging quality of the optical systems was analyzed in terms of the modulation transfer function (MTF) and spot diagram, as well as the geometric distortion [21][22][23].…”

Section: Image Quality Evaluationmentioning

confidence: 99%

Design of a Continuous-Zoom 2D/3D Microscope with High Zoom Ratio and Full Field of View

Gong,

Li,

Huang

et al. 2024

Photonics

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A four-group mechanically compensated continuous-zoom microscope is proposed and designed based on the theory of continuous zoom. The system addresses the limitations of traditional continuous-zoom microscopes, including a small zoom ratio, a short working distance, and the loss of details during 2D–3D switching. The system has a magnification of 0.6×~6.0× under two-dimensional observation, adapts to two-third-inch sensors, has a working distance of 130 mm, and adds a 360-degree rotatable beamsplitter for three-dimensional full-field-of-view observation. The magnification, numerical aperture, and sensor dimensions remain unchanged under both two-dimensional and three-dimensional observation. The design results demonstrate that the system is capable of achieving a high zoom ratio of 10× while maintaining a high level of imaging quality in both two-dimensional and three-dimensional modes. The MTF curves for each magnification are in close proximity to the diffraction limit, the spot diagrams are smaller than the airy disk range, and the zoom cam curves are smooth with no inflection points. Furthermore, the system negates the visual discrepancies and loss of detail that arise when switching observation modes due to alterations in system magnification and numerical aperture, thereby broadening the scope of applications for continuous-zoom microscopes.

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“…The imaging quality of the optical systems was analyzed in terms of the modulation transfer function (MTF) and spot diagram, as well as the geometric distortion [21][22][23].…”

Section: Image Quality Evaluationmentioning

confidence: 99%

Design of a Continuous-Zoom 2D/3D Microscope with High Zoom Ratio and Full Field of View

Gong,

Li,

Huang

et al. 2024

Photonics

View full text Add to dashboard Cite

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Head-mounted displays based on human eye condition variation patterns

Cao,

Wang,

Yan

et al. 2024

J. Opt. Soc. Am. A

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In response to the practical demands for a wide field of view (FOV), long exit pupil distance, and high image quality in head-mounted displays, an initial structure was built based on the principles of catadioptric lenses in a folded optical path (pancake optics) and the field curvature correction formula. Subsequently, using even-order aspheric surfaces, a VR optical system was developed with a FOV of 2w=110∘, an exit pupil distance of 15 mm, and an exit pupil diameter of 8 mm. Compared to traditional designs, a human eye model was introduced as the image plane to construct a VR–human eye optical system analysis model, allowing for direct analysis of the retinal image quality under different states of the human eye. After that, based on medical statistical data, the impact of different light intensity conditions on the retinal image quality of the VR optical system was explored. Experimental results showed that changes in light intensity affect the pupil diameter, which, in turn, influences the final image quality of the system. To solve the issues, two solutions were proposed: adjusting the screen distance and changing the lens spacing. Both methods significantly improved the imaging quality on the human retina, with an increase of over 30% in the average MTF value. A comparison of these methods was conducted, providing valuable references for future VR optical system designs.

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Design of optical system for stereo imaging fundus camera

Cited by 2 publications

References 0 publications

Design of a Continuous-Zoom 2D/3D Microscope with High Zoom Ratio and Full Field of View

Design of a Continuous-Zoom 2D/3D Microscope with High Zoom Ratio and Full Field of View

Head-mounted displays based on human eye condition variation patterns

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