[1] O′Donnell C, Hartwig A, Radhakrishnan H. Correlations between refractive error and biometric parameters in human eyes using the LenStar 900[J]. Contact Lens and Anterior Eye, 34, 26-31(2011).

[2] Hu D, Zhao G P, Yu J H et al. Comparison on eye biometry of Lenstar 900, A-scan ultrasound and keratometer in patients with cataract[J]. International Eye Science, 14, 1440-1443(2014).

[3] Kumar K K, Prakash A A, Neeraja T G et al. To compare central corneal thickness measurements obtained by Pentacam with those obtained by IOLMaster 700, Cirrus anterior segment optical coherence tomography and Tomey specular microscopy in normal healthy eyes[J]. Indian Journal of Ophthalmology, 69, 1713-1717(2021).

[4] Fang L P, Chen Z X, Chen P et al. Focus evaluation for automatic recognition in corneal curvature measurement[J]. Optical Technique, 45, 218-223(2019).

[5] Wang M, Chen H. Research on autofocus of the eyeball system based on image processing[J]. China Science and Technology Information, 46-47(2013).

[6] Yuan W Q, Yang R R, Zhang K Y. Research of relationship between iris clarity and human eye shooting distance[J]. Application Research of Computers, 28, 3162-3165(2011).

[7] Song B Q, Du W H, Duan N Q et al. Research on pupil location algorithm of non-contact tonometer[J]. Electronic Measurement Technology, 45, 112-117(2022).

[8] Lin S X, Lu Q T, Wang S Y et al. Non-ideal pupil positioning based on hole fully convolutional network[J]. Laser Journal, 42, 33-38(2021).

[9] Cai H Y, Shi Y, Lou S L et al. Pupil location algorithm applied to infrared ophthalmic disease detection[J]. Chinese Optics, 14, 605-614(2021).

[10] Wang J, Gao F, Li W Y et al. Device for automatic pupil center location and alignment[J]. Optics and Precision Engineering, 27, 1370-1377(2019).

[11] Brenner J F, Dew B S, Horton J B et al. An automated microscope for cytologic research a preliminary evaluation[J]. Journal of Histochemistry & Cytochemistry, 24, 100-111(1976).

[12] Tenenbaum J M. Accommodation in computer vision[D](1970).

[13] Vollath D. Automatic focusing by correlative methods[J]. Journal of Microscopy, 147, 279-288(1987).

[14] Xia H S, Yu F H. Auto focusing algorithm of digital microscope[J]. Laser & Optoelectronics Progress, 58, 0400002(2021).

[15] Xiong R, Gu N T, Xu H Y. An auto-focusing evaluation function adapted to multi-directional gray gradient change[J]. Laser & Optoelectronics Progress, 59, 0418001(2022).

[16] Zeng H F, Han C P, Li K et al. Improved gradient threshold image sharpness evaluation algorithm[J]. Laser & Optoelectronics Progress, 58, 2211001(2021).

[17] Zhu R S, Zhao L J. Research and application of face mask detection algorithm based on YOLOV4-tiny[J]. Academic Journal of Computing & Information Science, 5, 64-69(2022).

[18] Lu C, Xia S, Shao M et al. Arc-support line segments revisited: an efficient high-quality ellipse detection[J]. IEEE Transactions on Image Processing, 29, 768-781(2019).

[19] He L F, Ren X W, Gao Q H et al. The connected-component labeling problem: a review of state-of-the-art algorithms[J]. Pattern Recognition, 70, 25-43(2017).

[20] Zhai Y P, Zhou D X, Liu Y H et al. Design of evaluation index for auto-focusing function and optimal function selection[J]. Acta Optica Sinica, 31, 0418002(2011).

[21] Wildes R P. Iris recognition: an emerging biometric technology[J]. Proceedings of the IEEE, 85, 1348-1363(1997).

[22] Zhang H W, Wang S Y, Li X L et al. Research and implementation of pupil recognition based on Hough transform[J]. Chinese Journal of Liquid Crystals and Displays, 31, 621-625(2016).