[1] [1] C. F. Sinclair, W. S. Duke, A. M. Barbu, G. W. Randolph, Laryngeal Exam Indications and Techniques, Springer (2016).

[2] [2] D. L. Wohl, "Nonsurgical management of pediatric vocal fold nodules," Arch. Otolaryngol. Head Neck Surg. 131, 68–70 (2005).

[3] [3] D. Huang, E. A. Swanson, C. P. Lin, J. S. Schuman, W. G. Stinson, W. Chang, M. R. Hee, T. Flotte, K. Gregory, C. A. Puliafito, "Optical coherence tomography," Science 254, 1178–1181 (1991).

[4] [4] N. Nassif, B. Cense, B. H. Park, S. H. Yun, T. C. Chen, B. E. Bouma, G. J. Tearney, J. F. de Boer, "In vivo human retinal imaging by ultrahigh-speed spectral domain optical coherence tomography," Opt. Lett. 29, 4804–4882 (2004).

[5] [5] F. I. Feldchtein, G. V. Gelikonov, V. M. Gelikonov, R. V. Kuranov, A. M. Sergeev, N. D. Gladkova, "Endoscopic applications of optical coherence tomography," Opt. Express 3(6), 257–269 (1998).

[6] [6] K. A. Vermeer, J. Van der Schoot, H. G. Lemij, J. F. De Boer, "Automated segmentation by pixel classi-fication of retinal layers in ophthalmic OCT images," Biomed. Opt. Express 2(6), 1743–1756 (2011).

[7] [7] A. M. Sergeev, V. Gelikonov, G. Gelikonov, F. I. Feldchtein, R. Kuranov, N. Gladkova, N. Shakhova, L. Snopova, A. Shakhov, I. Kuznetzova, "In vivo endoscopic OCT imaging of precancer and cancer states of human mucosa," Opt. Express 1, 432–440 (1997).

[8] [8] S. Guo, R. Hutchison, R. P. Jackson, A. Kohli, T. Sharp, E. Orwin, R. Haskell, Z. Chen, B. J. Wong, "O±ce-based optical coherence tomographic imaging of human vocal cords," J. Biomed. Opt. 11, 30501 (2006).

[9] [9] S. Guo, L. Yu, A. Sepehr, J. Perez, J. Su, J. M. Ridgway, D. Vokes, B. J. Wong, Z. Chen, "Gradient-index lens rod based probe for o±cebased optical coherence tomography of the human larynx," J. Biomed. Opt. 14(2), 014017 (2009).

[10] [10] S. Donner, S. Bleeker, T. Ripken, M. Ptok, M. Jungheim, A. Krueger, "Automated working distance adjustment enables optical coherence tomography of the human larynx in awake patients," J. Med. Imag. 2, 026003 (2015).

[11] [11] Leiner, C. Dennis, Digital Endoscope Design SPIE (2015).

[12] [12] J. M. Geary, Introduction to Lens Design with Practical ZEMAXr Examples, Willmann-Bell, Richmond (2002).

[13] [13] C. Wang, X. N. Dong, G. Cai, M. H. Chen, G. Zheng, "Design and implementation of video lens with high-definition resolution for otolaryngology endoscope," Opt. Instrum. 30(3), 5–6 (2007).

[14] [14] Z. Ding, H. Ren, Y. Zhao, J. S. Nelson, Z. Chen, "High-resolution optical coherence tomography over a large depth range with an axicon lens,"Opt. Lett. 27, 243–245 (2002).

[15] [15] S. J. Dobson, H. H. Hopkins, "A new rod-lens relay system offering improved image quality," J. Phys. E 22(7), 450–455 (1989).

[16] [16] S. Ohmi, H. Sakai, Y. Asahara, S. Nakayama, Y. Yoneda and T. Izumitani, "Gradient-index rod lens made by a double ion-exchange process," Appl. Opt. 27, 496–499 (1988).

[17] [17] N. Yamamoto, K. Iga, "Evaluation of gradientindex rod lenses by imaging," Appl. Opt. 19, 1101–1104 (1980).

[18] [18] Z. Manual, ZEMAX Development Corporation, WA, USA (2007).

[19] [19] Y. L. Fu, Y. Xiang, H. Wang, "Optical system design of hd wide-angle fine video rhinoscope," J. Changchun Univ. Technol., Nat. Sci. Ed., 41(01), 67–70 (2018).