{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T01:22:52Z","timestamp":1772500972727,"version":"3.50.1"},"reference-count":25,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2018,9,14]],"date-time":"2018-09-14T00:00:00Z","timestamp":1536883200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2017R1A6A3A01007041, NRF-2017R1C1B5015194"],"award-info":[{"award-number":["2017R1A6A3A01007041, NRF-2017R1C1B5015194"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2017R1A6A3A01007041"],"award-info":[{"award-number":["2017R1A6A3A01007041"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2017R1C1B5015194"],"award-info":[{"award-number":["2017R1C1B5015194"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>The eye blink rate, a major human physiological response, directly affects ocular diseases, such as keratitis and dry eye syndrome. It has been shown that the eye blink rate in normal eyes has a certain frequency for individuals, from 6\u201330 times\/min. It was suggested in a previous study that the eye blink rate can be decreased during the viewing of high-intensity and realistic content. Therefore, in this paper, we examine the change of the eye blink rate during the HMD (head-mounted display) viewing of VR (virtual reality) contents; accordingly, we propose an algorithm to measure the eye blink rate as well as compare and analyze this rate in three different environments (natural, monitor, and HMD). We confirmed that IPD (interpupillary distance) and phoria affected the eye blink rate in each environment. In this experiment, 21 subjects (28.38 \u00b1 6.87 years) were selected, and a paired t-test was performed for changes in the eye blink rate over 1 min for each environment. The IPD and phoria effects on the eye blink rate were confirmed using the Spearman\u2019s correlation coefficient. In this experiment, the eye blink rate was decreased in the monitor and HMD environments compared with the natural environment, while that in the HMD environment was decreased compared with the monitor environment. The results of the correlation analysis of far IPD and the eye blink rate show no statistical significance or correlation. The correlation analysis of near IPD and the eye blink rate showed a strong positive correlation of the eye blink rate in the monitor environment. The correlation analysis of distance phoria and the eye blink rate showed a strong negative correlation of the eye blink rate in the HMD environment. The correlation analysis of near-field phoria and the eye blink rate showed a strong negative correlation of the eye blink rate in the HMD environment. It is expected that the results of this study will be used as a VR-viewing recommendation.<\/jats:p>","DOI":"10.3390\/sym10090400","type":"journal-article","created":{"date-parts":[[2018,9,14]],"date-time":"2018-09-14T10:57:59Z","timestamp":1536922679000},"page":"400","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Change of Blink Rate in Viewing Virtual Reality with HMD"],"prefix":"10.3390","volume":"10","author":[{"given":"Jungho","family":"Kim","sequence":"first","affiliation":[{"name":"Industry-Academic Collaboration Foundation, Kwangwoon University, Seoul 01897, Korea"}]},{"given":"Yadav","family":"Sunil Kumar","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Korea"}]},{"given":"Jisang","family":"Yoo","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Korea"}]},{"given":"Soonchul","family":"Kwon","sequence":"additional","affiliation":[{"name":"Graduate School of Smart Convergence, Kwangwoon University, Seoul 01897, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2018,9,14]]},"reference":[{"key":"ref_1","unstructured":"Harald, K. (1992). Schule der Farben: Grundz\u00fcge der: Farbentheorie fur Computeranwender und andere, DuMont Reiseverlag."},{"key":"ref_2","unstructured":"Jason, J. (2015). The VR Book: Human-Centered Design for Virtual Reality, Morgan & Claypool. [1st ed.]."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1152\/jn.1984.52.2.323","article-title":"Blinking and associated eye movements in humans, guinea pigs, and rabbits","volume":"52","author":"Evinger","year":"1984","journal-title":"J. Neurophysiol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1555","DOI":"10.1001\/archopht.1991.01080110091043","article-title":"Eyelid movements in facial paralysis","volume":"109","author":"Sibony","year":"1991","journal-title":"Arch. Ophthalmol."},{"key":"ref_5","first-page":"387","article-title":"Eyelid movements: mechanisms and normal data","volume":"32","author":"Evinger","year":"1991","journal-title":"Investig. Ophthalmol. Vis. Sci."},{"key":"ref_6","unstructured":"Newell, F.W. (1986). Ophthalmology, C. V. Mosby. [6th ed.]."},{"key":"ref_7","unstructured":"Stewart, D.-E. (1968). System of Ophthalmology, Vol 4, The Physiology of the Eye and of Vision, C. V. Mosby."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1097\/OPX.0b013e318236dd88","article-title":"Asthenopia and blink rate under visual and cognitive loads","volume":"89","author":"Gowrisankaran","year":"2012","journal-title":"Optom. Vis. Sci."},{"key":"ref_9","first-page":"15","article-title":"A study on the confidence of dry eye diagnosis methods","volume":"13","author":"Lee","year":"2008","journal-title":"J. Korean Ophthalmic Opt. Soc."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"712","DOI":"10.1097\/00006324-200110000-00011","article-title":"Consideration of three types of spontaneous eyeblink activity in normal humans: During reading and video display terminal use, in primary gaze, and while in conversation","volume":"78","author":"Doughty","year":"2001","journal-title":"Optom. Vis. Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"106","DOI":"10.1097\/OPX.0b013e318194e962","article-title":"Blinking and tear break-up during four visual tasks","volume":"86","author":"Himebaugh","year":"2009","journal-title":"Optom. Vis. Sci."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"306","DOI":"10.1007\/s00417-003-0845-z","article-title":"Marked reduction and distinct patterns of eye blinking in patients with moderately dry eyes during video display terminal use","volume":"242","author":"Schlote","year":"2004","journal-title":"Graefes Arch. Clin. Exp. Ophthalmol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"888","DOI":"10.1097\/00006324-199111000-00010","article-title":"Effect of visual display unit use on blink rate and tear stability","volume":"68","author":"Patel","year":"1991","journal-title":"Optom. Vis. Sci."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1192\/bjp.143.1.55","article-title":"Blink rate in psychiatricillness","volume":"143","author":"Mackintosh","year":"1983","journal-title":"Br. J. Psychiatr."},{"key":"ref_15","first-page":"29","article-title":"Spontaneous blink rate of a normal population sample","volume":"26","author":"Briggs","year":"1999","journal-title":"ICLC"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"732","DOI":"10.1097\/00006324-200311000-00008","article-title":"Is all asthenopia the same?","volume":"80","author":"Sheedy","year":"2003","journal-title":"Optom. Vis. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1016\/j.ajo.2006.11.060","article-title":"Impact of Dry Eye Syndrome on Vision-Related Quality of Life","volume":"143","author":"Biljana","year":"2007","journal-title":"Am. J. Ophthalmol."},{"key":"ref_18","unstructured":"Paul, V., and Michael, J. (2001, January 8\u201314). Rapid Object Detection using a Boosted Cascade of Simple Features. Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition, Kauai, HI, USA."},{"key":"ref_19","first-page":"137","article-title":"Robust real-time face detection","volume":"57","author":"Paul","year":"2001","journal-title":"Int. J. Comput. Vis."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1007\/BF01795228","article-title":"The proportion of the face in younger adults using the thumb rule of Leonardo da Vinci","volume":"18","author":"Oguz","year":"1996","journal-title":"Surg. Radiol. Anat."},{"key":"ref_21","unstructured":"Yadav, S.K., Yoo, J.S., and Kwon, S.C. (2018, January 12\u201314). Implementation and Performance Evaluation of Eye-blink Rate Detection Algorithms for Natural and HMD Environment. Proceedings of the Advanced Engineering and ICT-Convergence, Seoul, Korea."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Zeeshan, A.H., and Ziaul, H. (2016, January 12\u201314). Eye-Blink rate detection for fatigue determination. Proceedings of the 1st India International Conference on Information Processing, Delhi, India.","DOI":"10.1109\/IICIP.2016.7975348"},{"key":"ref_23","unstructured":"Matjaz, D. (2009, January 20\u201322). Eye blink based fatigue detection for prevention of Computer Vision Syndrome. Proceedings of the IAPR Conference on Machine Vision Applications, Yokohama, Japan."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"59","DOI":"10.9790\/1813-0606015963","article-title":"A Study for Applications of Histogram in Image Enhancement","volume":"6","author":"Harpreet","year":"2017","journal-title":"Int. J. Eng. Sci."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"369","DOI":"10.14479\/jkoos.2015.20.3.369","article-title":"Relationship between Reading Speed and Blinking Rate according to Longitudinal Chromatic Aberration during Book Reading","volume":"20","author":"Kim","year":"2015","journal-title":"J. Korean Ophthalmic Opt. 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