Researching | Research on improving the universality of adaptive optical retinal imaging system

Chinese Journal of Liquid Crystals and Displays, Volume. 38, Issue 5, 563(2023)

Research on improving the universality of adaptive optical retinal imaging system

Yan-yan YANG^1,2, Qi-li HU³, Ming HU^1,2, Lü JIANG^1,2, Jia-hao FENG^1,2, Sheng-xiao HUA^1,2, Jing-jing WU^1,2, Zhou-ping SU^1,2, and Li-fa HU^1,2、*

Author Affiliations

¹College of Science，Jiangnan University，Wuxi 214122，China

²Jiangsu Provincial Research Center of Light Industry Optoelectronic Engineering and Technology，Wuxi 214122，China

³Key Laboratory of Electro-Optical Countermeasure Test & Evaluation Technology，Luoyang 471003，China

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Figures&Tables (20)

References (19)

Paper Information

Figures & Tables(20)

Fig. 1. Schematic diagram of adaptive optics system for fundus imaging

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Fig. 2. Operating principle of Badal system

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Fig. 3. Relationship between distance L and human eye diopter

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Fig. 4. Schematic diagram of visual beacon positioning

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Fig. 5. Visual system light path

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Fig. 6. Schematic diagram of the axial cone lens set

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Fig. 7. 8 D Navarro eye model

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Fig. 8. Schematic diagram of the lighting subsystem

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Fig. 9. Intensity distribution

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Fig. 10. Wavefront diagram of system chromatic aberration

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Fig. 11. 3D diagram of the imaging subsystem

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Fig. 12. Pointing diagram of the imaging subsystem（Blue：808 nm；Green：635 nm）

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Fig. 13. MTF diagram of the imaging subsystem

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Fig. 14. Physical diagram of system optical path

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Fig. 15. Results of AO on and AO off

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Fig. 16. Comparison diagram of detection branch before and after correction

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Table 1. Relationship between lens parameters and diopter

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Table 1. Relationship between lens parameters and diopter

Lens parameters	Relationship between lens parameters and diopter
Ant lens radius $R_{3}$	$R_{3} (D) = 10.2 - 1.75 l n (D + 1)$
Post lens radius $R_{4}$	$R_{4} (D) = - 6 + 0.229 4 l n (D + 1)$
Post cornea thickness $D_{2}$	$D_{2} (D) = 3.05 - 0.05 l n (D + 1)$
Lens thickness $D_{3}$	$D_{3} (D) = 4 + 0.1 l n (D + 1)$
Lens refractive index $n_{3}$	$n_{3} (D) = 1.42 + 9 e^{- 5} (10 D + D^{2})$
Ant lens conic constant $Q_{3}$	$Q_{3} (D) = - 3.131 6 - 0.34 l n (D + 1)$
Post lens conic constant $Q_{4}$	$Q_{4} (D) = - 1 - 0.125 l n (D + 1)$

Table 2. Structural parameters of 8 D Navarro eye model

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Table 2. Structural parameters of 8 D Navarro eye model

Surface	Type	Radius/mm	Thickness/mm	Optical media	Conic constant
Ant cornea	Conic	7.72	0.55	Cornea	-0.26
Post cornea	Spherical	6.50	2.94	Aqueous	0
Pupil	Plane	infinity	0	Aqueous	0
Ant lens	Conic	6.355	4.22	Lens	-3.879
Post lens	Conic	-5.496	16.4	Vitreous	-1.275
Retina	Spherical	-12	—	—	—

Table 3. Optical tolerance processing level

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Table 3. Optical tolerance processing level

Grade	Refractive index	Aperture number	Thickness/mm	Irregularity	Wedge tolerance/（'）	Abbe error/%	Lens tilt/（'）	Lens eccentricity/mm
Q1	0.000 1	0.5	0.01	0.1	0.17	0.01	0.17	0.001
Q2	0.000 3	1	0.01	0.1	0.3	0.03	0.3	0.003
Q3	0.000 5	1	0.012 5	0.25	0.5	0.05	0.5	0.005
Q4	0.000 8	2	0.025	0.25	0.8	0.08	0.8	0.008
Q5	0.001	2	0.037 5	0.5	1	0.1	1	0.01
Q6	0.003	3	0.05	0.5	1.5	0.3	1.5	0.03
Q7	0.005	3	0.075	1	2	0.5	2	0.05
Q8	0.008	3	0.1	2	3	0.8	3	0.08

Table 4. Benign rate of Monte Carlo
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Table 4. Benign rate of Monte Carlo
Monte-Carlo analysis MTF value
≥90% 0.214
≥80% 0.225
≥50% 0.239
≥20% 0.246
≥10% 0.247

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Yan-yan YANG, Qi-li HU, Ming HU, Lü JIANG, Jia-hao FENG, Sheng-xiao HUA, Jing-jing WU, Zhou-ping SU, Li-fa HU. Research on improving the universality of adaptive optical retinal imaging system[J]. Chinese Journal of Liquid Crystals and Displays, 2023, 38(5): 563

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Paper Information

Category: Research Articles

Received: Jan. 25, 2023

Accepted: --

Published Online: Jul. 4, 2023

The Author Email: Li-fa HU (hulifa@jiangnan.edu.cn)

DOI:10.37188/CJLCD.2023-0019

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