Optical Design of Adaptive Optics Scanning Laser Ophthalmoscope with Adjustable Focus

Fig. 1. Structure diagram of Badal system. (a) Schematic diagram of unfolded Badal system, the red represents state after focusing; (b) structure diagram of folded Badal system

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Fig. 2. Optical path of AOSLO

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Fig. 3. Design of diopter compensation system using Zemax

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Fig. 4. Design of lighting and imaging optical systems using Zemax

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Fig. 5. Spot diagrams of diopter compensation system with different fields of view. (a) 0.590 μm wavelength; (b) 0.785 μm wavelength

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Fig. 6. Field curvature and distortion of diopter compensation system

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Fig. 7. Spot diagrams for different configurations and diopters

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Fig. 8. Modulation Transfer Functions for different FOV. (a) 0 m-1 diopter; (b) -6 m-1 diopter; (c) +6 m-1 diopter

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Table 1. Optimum parameters of Badal system for different maximum myopia diopters

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Table 1. Optimum parameters of Badal system for different maximum myopia diopters

Maximummyopiadiopter /m^-1	Optimumlens focallength /mm	Maximum opticalpath betweenlenses /mm
-8.0	125.00	125.00
-7.5	133.33	133.33
-7.0	142.86	142.86
-6.5	153.85	153.85
-6.0	166.67	166.67
-5.5	181.82	181.82
-5.0	200.00	200.00
-4.5	222.22	222.22
-4.0	250.00	250.00
-3.5	285.71	285.71
-3.0	333.33	333.33

Table 2. Parameters of optical design

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Table 2. Parameters of optical design

Entrancepupildiameter /mm	SLDwavelength /nm	Field ofview /(°)	Dioptercompensationrange /m^-1	DM clearaperture /mm×mm	CCD senordimensions /mm×mm	PMTeffectivearea /mm	HSscannereffectivearea /mm×mm	VS scannereffective area /mm×mm
6.6	785	±1.25	-6-+6	4.4×4.4	8.8×6.6	Φ5	4×4	8×12

Table 3. Configuration parameters
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Table 3. Configuration parameters
Concave mirror f /mm Diameter/mm Tilt X /(°)
M₁ 300 25.4 3
M₂ 200 25.4 -6.5
M₃ 200 25.4 -6.5
M₄ 150 25.4 5
M₅ 200 50.8 5
M₆ 400 50.8 -5
M₇ 300 50.8 -5.5
M₈ 300 50.8 5

Table 4. Strehl ratio analysis at different fields-of-view, from -1.25° to 1.25° at eye pupil

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Table 4. Strehl ratio analysis at different fields-of-view, from -1.25° to 1.25° at eye pupil

Configuraton		Strehl ratio
No.	Field (X, Y) /(°)	-6 m^-1 diopter	-3 m^-1 diopter	0 m^-1 diopter	+3 m^-1 diopter	+6 m^-1 diopter
1	(0, 0)	0.930	0.937	0.937	0.973	0.984
2	(0, 1)	0.936	0.951	0.958	0.974	0.931
3	(1, 0)	0.939	0.955	0.963	0.972	0.930
4	(0, 1.25)	0.938	0.956	0.965	0.967	0.919
5	(0, -1.25)	0.938	0.958	0.973	0.984	0.911
6	(1.25, 0)	0.942	0.962	0.972	0.960	0.904
7	(-1.25, 0)	0.942	0.962	0.972	0.960	0.904
8	(1.25, 1.25)	0.942	0.967	0.973	0.905	0.755
9	(1.25, -1.25)	0.939	0.965	0.975	0.915	0.753
10	(-1.25, 1.25)	0.942	0.967	0.973	0.905	0.755
11	(-1.25, -1.25)	0.939	0.965	0.975	0.915	0.753
Average		0.939	0.959	0.967	0.948	0.864

Table 5. Tolerance data of optical system
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Table 5. Tolerance data of optical system
Parameters Range
Radius of curvature /mm ±1
Thickness /mm ±0.2
Element decenter /mm ±0.1
Element tilt /(°) ±0.1
Surface irregularity /fringes ±0.2
Index of refraction ±0.001

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Huilü Jiang, Chaohong Li, Na Liao, Yiyu Li, Hao Chen. Optical Design of Adaptive Optics Scanning Laser Ophthalmoscope with Adjustable Focus[J]. Laser & Optoelectronics Progress, 2019, 56(2): 022202

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