Infrared and Laser Engineering, Volume. 53, Issue 10, 20240275(2024)
Optical design of a confocal fundus imaging system with ultra-wide angle and long exit pupil distance (invited)
Figures & Tables(15)
Fig. 2. Schematic diagram of the combined optical path of a wide-angle eyepiece and a long exit pupil eyepiece
Fig. 7. MTF curves of imaging systems with different working wavelengths
Fig. 8. Full-field-of-view RMS radius of imaging systems with different diopters
Table 1. System design specifications
View tableView in ArticleTable 1. System design specifications
Specifications Value FOV 110° Exit pupil distance/mm >10 Mechanical diameter/mm ≤60 Refractive errors range ±15 D Object NA 0.04 Resolution/μm 7.5
Table 2. Parameters of wide-angle eye model
View tableView in ArticleTable 2. Parameters of wide-angle eye model
Optical medium Radius/mm Thickness/mm Conic constant Vitreous 12 16.32 0 Lens 6 4 −1 Aqueous −10.2 0 − 3.1316 Iris Infinity 3.05 0 Cornea −6.5 0.55 0 - −7.72 - −0.26
Table 3. Position parameters of the diopter compensation lenses
View tableView in ArticleTable 3. Position parameters of the diopter compensation lenses
Refractive power, A/D d1/mm d2/mm −15 64.520 17.496 −10 61.015 21.001 −5 57.550 24.466 0 54.223 27.793 5 49.510 32.506 10 45.348 36.668 15 40.143 41.873
Table 4. Tolerance distribution of the objective lenses
View tableView in ArticleTable 4. Tolerance distribution of the objective lenses
Parameter Tolerance Radius/fringe ±2 Thickness/mm ±0.025 Decenter (Surface)/mm ±0.008 Tilt (Surface)/(´) ±0.8 Decenter (Element)/mm ±0.008 Tilt (Element)/(´) ±0.8 Irregularity/fringe ±0.3 Index ± 0.0003 Abbe ±0.5% Surface irregularity of aspheric surface λ/10
Table 5. Surface irregularity of scanning mirror and beam splitter
View tableView in ArticleTable 5. Surface irregularity of scanning mirror and beam splitter
Surface Surface irregularity ( $ \lambda $ Scanning mirror RMS $ \lambda $ Beam splitter RMS $ \lambda $
Table 6. Tolerance distribution of imaging lenses
View tableView in ArticleTable 6. Tolerance distribution of imaging lenses
Parameter Tolerance Radius/fringe ±2 Thickness/mm ±0.025 Decenter (Surface)/mm ±0.03 Tilt (Surface)/(´) ±3 Decenter (Element)/mm ±0.03 Tilt (Element)/(´) ±3
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Siqi HE, Rundong FAN, Zhihao CHEN, Yan MO, Donglin MA. Optical design of a confocal fundus imaging system with ultra-wide angle and long exit pupil distance (invited)[J]. Infrared and Laser Engineering, 2024, 53(10): 20240275
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Received: Jun. 26, 2024
Accepted: --
Published Online: Dec. 13, 2024
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