Laser Exposure Safety Analysis for Adaptive Optics Retinal Imaging System

Ying Liu; Yaliang Yang; Xian Yue

doi:10.3788/AOS202040.1014003

Journals >Acta Optica Sinica >Volume 40 >Issue 10 >Page 1014003 > Article

Acta Optica Sinica
Vol. 40, Issue 10, 1014003 (2020)

Laser Exposure Safety Analysis for Adaptive Optics Retinal Imaging System

Ying Liu^1、2、3, Yaliang Yang^1、2、*, and Xian Yue^1、2、3

Author Affiliations

¹Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China

²Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China

³University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/AOS202040.1014003 Cite this Article Set citation alerts

Ying Liu, Yaliang Yang, Xian Yue. Laser Exposure Safety Analysis for Adaptive Optics Retinal Imaging System[J]. Acta Optica Sinica, 2020, 40(10): 1014003 Copy Citation Text

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Fig. 1. Schematic of human retinal AO imaging system

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Fig. 2. Distribution of spectral power density. (a) Imaging light source; (b) beacon light source

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Wavelength /nm	R(λ)	C_c
700--1050	10^(700-^λ⁾^/⁵⁰⁰	1.0
1050--1150	0.2	1.0
1150--1200	0.2×10⁰^.^02×(1150-^λ⁾	10^0.018(^λ^-1150)
1200--1400	0.02	8+10⁰^.⁰⁴⁽^λ^-1250)

Table 1. Retinal hazard spectral weight function and absorption coefficient^[13-14]

Condition	α /rad	t /s	E_L /(W·m^-2·sr^-1)
	α_min≤α<α_max	t<10^-6
Basic exposure limit	α_min≤α<α_max	10^-6≤t<0.25	2×10⁴×α^-1×t⁰^.⁷⁵
	α_min≤α<α_max	t≥0.25	2.8×10⁴×α^-1
	α≥α_max	t<10^-6
Large source	α≥α_max	10^-6≤t<625×10^-6
	α≥α_max	625×10^-6 ≤t<0.25
	α≥α_max	t≥0.25	28×10⁴
	α<α_min	t<10^-6
Small source	α<α_min	10^-6≤t<0.25	1.3×10⁷×t⁰^.⁷⁵
	α<α_min	t≥0.25	1.9×10⁷

Table 2. Calculation of retinal radiance limits^[13]

α /rad	Number of pulses n	Exposure limit /(W·m^-2·sr^-1)
α≤α_max	n<40	E_L×n^-0^.²⁵
	n≥40	0.4×E_L
α_max<α≤0.1	n<625	E_L×n^-0^.²⁵
	n≥625	0.2×E_L
α>0.1		E_L

Table 3. Retinal radiance limit for repeated pulse exposure

Ying Liu, Yaliang Yang, Xian Yue. Laser Exposure Safety Analysis for Adaptive Optics Retinal Imaging System[J]. Acta Optica Sinica, 2020, 40(10): 1014003

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