Lensless Refractive Measurement System Based on Shack‐Hartmann Wavefront Detection

Kangjie Geng; Hetong Zhang; Shangshang Ding; Yang Zhang; Min Liu; Weiwei Fu

doi:10.3788/CJL231325

Chinese Journal of Lasers, Volume. 51, Issue 3, 0307401(2024)

Lensless Refractive Measurement System Based on Shack‐Hartmann Wavefront Detection

Kangjie Geng^1,2, Hetong Zhang^1,2, Shangshang Ding^1,2, Yang Zhang^1,2, Min Liu^1,2、*, and Weiwei Fu^1,2、**

¹Division of Life Sciences and Medicine, School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei 230000, Anhui , China

²Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu , China

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Figures & Tables(11)

Fig. 1. Principle of Schack-Hartmann wavefront sensor

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Fig. 2. Relationship between spot offset and wavefront slope

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Fig. 3. Modeling of the image acquisition optical path

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Fig. 4. Hartmann photogram

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Fig. 5. Actual measured diopter as a function of distance between Schack-Hartmann sensor and human eye

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Fig. 6. Schematic illustration of the variation of wavefront with propagation distance in myopic eyes

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Fig. 7. True diopter corrected by the distal point formula

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Fig. 8. Optical schematic

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Fig. 9. Physical drawing of the test prototype

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Table 1. Parameters of the eye model

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Table 1. Parameters of the eye model

Ocular structure	Radius of curvature-front surface /mm	Radius of curvature-rear surface /mm	Thicknesses /mm	Index of refraction
Retina	-12.3	-12.3
Vitreous humor			16.60	1.3360
Lens	10.2	6.0	4.00	1.4200
Aqueous humor			3.05	1.3374
Cornea	7.8	6.5	0.55	1.3771

Table 2. Measurement results

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Table 2. Measurement results

Eye model diopter /D	Spherical diopter			Cylindrical diopter
Eye model diopter /D	Average value /D	Coefficient of variation	Maximum error /D	Average value /D	Coefficient of variation	Maximum error /D
-10	9.999747	0.006776	0.14	-0.229595	0.087357	0.24
-5	5.000205	0.007938	0.07	-0.018236	0.081948	0.20
-2.5	2.476266	0.015544	0.06	-0.150483	0.068570	0.15
0	0.000913		0.06	-0.110323	0.083579	0.12
2.5	-2.491896	0.029575	0.09	-0.139499	0.061646	0.15
5	-5.000108	0.027696	0.16	-0.234197	0.025686	0.15
10	-9.999857	0.023353	0.20	-0.151667	0.075914	0.23

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Kangjie Geng, Hetong Zhang, Shangshang Ding, Yang Zhang, Min Liu, Weiwei Fu. Lensless Refractive Measurement System Based on Shack‐Hartmann Wavefront Detection[J]. Chinese Journal of Lasers, 2024, 51(3): 0307401

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Paper Information

Category: Bio-Optical Sensing and Manipulation

Received: Sep. 24, 2023

Accepted: Nov. 16, 2023

Published Online: Jan. 24, 2024

The Author Email: Liu Min (lium@sibet.ac.cn), Fu Weiwei (fuww@sibet.ac.cn)

DOI:10.3788/CJL231325

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology