{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T00:36:18Z","timestamp":1760574978859,"version":"build-2065373602"},"reference-count":49,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:00:00Z","timestamp":1760140800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background\/Objectives: Reliable and objective assessment of saccadic duration is crucial in sports vision, yet standardized clinical tools remain scarce; therefore, this study evaluated the intraobserver and interobserver repeatability of saccadic time measurements using COI-SV\u00ae software, and analyzed the influence of age and sex. Methods: Saccadic duration was assessed in 78 participants using a 20\/40 Snellen letter stimulus appearing in four directions (up, down, left, right) at two distances. The shortest response time per direction was recorded. General mean values (total, vertical, horizontal, short, long, and ratios) were calculated. Repeatability was evaluated through a protocol of four test repetitions (two intrasession and two intersession with different examiners). ANCOVA and Pearson correlation assessed sex and age effects. Repeatability indices and Bland\u2013Altman plots were used to determine agreement. Results: Regarding sex, there were no significant differences between men and women. Saccadic duration showed a direct relationship with age (p &lt; 0.05), indicating that older participants had worse saccadic time values (longer times). Overall, intraexaminer repeatability was poor, whereas interexaminer reproducibility was between fair and good. Bland\u2013Altman analysis showed limits of agreement ranging from \u2212159.0 to 220.3 milliseconds (ms) for specific time values and from \u221287.0 to 122.52 ms for general values, which may be useful in clinical practice. Conclusions: The study shows that the COI-SV\u00ae software provides moderate to good interexaminer reliability and poor to acceptable intraexaminer repeatability of saccadic duration measurements, indicating that further refinement and validation are needed before considering clinical implementation.<\/jats:p>","DOI":"10.3390\/jcm14207170","type":"journal-article","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T10:12:29Z","timestamp":1760523149000},"page":"7170","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Repeatability and Reproducibility of a Saccadic Eye Movement Time Test"],"prefix":"10.3390","volume":"14","author":[{"given":"Antonio","family":"R\u00edder-V\u00e1zquez","sequence":"first","affiliation":[{"name":"Department of Physics of Condensed Matter (Optics Area), University of Seville, Reina Mercedes S\/N, 41012 Seville, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4851-680X","authenticated-orcid":false,"given":"Estanislao","family":"Guti\u00e9rrez-S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Department of Surgery (Ophthalmology Area), University of Seville, Doctor Fedriani S\/N, 41009 Seville, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Velasco-Olea","sequence":"additional","affiliation":[{"name":"Centro de Optometr\u00eda Internacional (COI), Chile N\u00ba10, 28016 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0996-5007","authenticated-orcid":false,"given":"Clara","family":"Martinez-Perez","sequence":"additional","affiliation":[{"name":"Applied Physics Department (Optometry Area), Facultade de \u00d3ptica e Optometr\u00eda, Universidade de Santiago de Compostela, 15705 Santiago de Compostela, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9453-8615","authenticated-orcid":false,"given":"Mar\u00eda Carmen","family":"S\u00e1nchez-Gonz\u00e1lez","sequence":"additional","affiliation":[{"name":"Department of Physics of Condensed Matter (Optics Area), University of Seville, Reina Mercedes S\/N, 41012 Seville, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Buscemi, A., Mondelli, F., Biagini, I., Gueli, S., D\u2019Agostino, A., and Coco, M. (2024). Role of Sport Vision in Performance: Systematic Review. J. Funct. Morphol. Kinesiol., 9.","DOI":"10.3390\/jfmk9020092"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1111\/cxo.12812","article-title":"Static and dynamic visual acuity and refractive errors in elite football players","volume":"102","author":"Jorge","year":"2019","journal-title":"Clin. Exp. Optom."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"S\u00e1nchez-Tena, M.\u00c1., Rodr\u00edguez-Alonso, X., Martinez-Perez, C., Tornero-Aguilera, J.F., Clemente-Su\u00e1rez, V.J., Sanchez-Ramos, C., and Alvarez-Peregrina, C. (2025). A Descriptive Analysis of Visual and Oculomotor Skills in Federated University Athletes. Appl. Sci., 15.","DOI":"10.3390\/app15010418"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1016\/j.jns.2011.07.039","article-title":"The King-Devick test and sports-related concussion: Study of a rapid visual screening tool in a collegiate cohort","volume":"309","author":"Galetta","year":"2011","journal-title":"J. Neurol. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"97","DOI":"10.4085\/1062-6050-0063.21","article-title":"King-Devick Sensitivity and Specificity to Concussion in Collegiate Athletes","volume":"58","author":"Le","year":"2023","journal-title":"J. Athl. Train."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"73","DOI":"10.2147\/OPTO.S232487","article-title":"Spotlight on the Developmental Eye Movement (DEM) Test","volume":"13","author":"Facchin","year":"2021","journal-title":"Clin. Optom."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Facchin, A., and Maffioletti, S. (2018). The Reliability of the DEM Test in the Clinical Environment. Front. Psychol., 9.","DOI":"10.3389\/fpsyg.2018.01279"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Facchin, A., Maffioletti, S., and Daini, R. (2025). Developmental Eye Movement (DEM) Test in Adults: Age-Related Changes and Italian Normative Data. Vision, 9.","DOI":"10.3390\/vision9010010"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1111\/j.1600-0838.2005.00535.x","article-title":"Comparison of saccadic eye movements and facility of ocular accommodation in female volleyball players and non-players","volume":"17","author":"Jafarzadehpur","year":"2007","journal-title":"Scand. J. Med. Sci. Sports"},{"key":"ref_10","first-page":"99","article-title":"A study of saccadic eye movement dynamics in volleyball: Comparison between athletes and non-athletes","volume":"50","author":"Piras","year":"2010","journal-title":"J. Sports Med. Phys. Fit."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Kishita, Y., Ueda, H., and Kashino, M. (2020). Eye and Head Movements of Elite Baseball Players in Real Batting. Front. Sports Act. Living, 2.","DOI":"10.3389\/fspor.2020.00003"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Tatara, S., Toda, H., Maeda, F., Ito, A., and Handa, T. (2024). Comparison of the Saccadic Eye Movement Ability of Female Professional Basketball Players and Non-Athletes. Appl. Sci., 14.","DOI":"10.3390\/app14031108"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Bae, Y. (2022). Decreased Saccadic Eye Movement Speed Correlates with Dynamic Balance in Older Adults. Int. J. Environ. Res. Public Health, 19.","DOI":"10.3390\/ijerph19137842"},{"key":"ref_14","unstructured":"Erickson, G.B. (2020). Sports Vision: Vision Care for the Enhancement of Sports Performance, Elsevier."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"723","DOI":"10.1097\/OPX.0000000000001729","article-title":"Review: Vision and On-field Performance: A Critical Review of Visual Assessment and Training Studies with Athletes","volume":"98","author":"Laby","year":"2021","journal-title":"Optom. Vis. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1016\/j.jneumeth.2014.05.010","article-title":"Nonlinear analysis of saccade speed fluctuations during combined action and perception tasks","volume":"232","author":"Stan","year":"2014","journal-title":"J. Neurosci. Methods"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1507","DOI":"10.1097\/OPX.0b013e318230f03a","article-title":"Reliability of the developmental eye movement test","volume":"88","author":"Orlansky","year":"2011","journal-title":"Optom. Vis. Sci."},{"key":"ref_18","first-page":"934","article-title":"A reevaluation of the Developmental Eye Movement (DEM) test\u2019s repeatability","volume":"81","author":"Rouse","year":"2004","journal-title":"Optom. Vis. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"387","DOI":"10.1016\/j.optm.2005.05.006","article-title":"Developmental Eye Movement Test: Reliability and symptomatology","volume":"76","author":"Tassinari","year":"2005","journal-title":"Optometry"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1076\/ceyr.25.2.117.10155","article-title":"Correlation between reading skills and different measurements of convergence amplitude","volume":"25","author":"Morad","year":"2002","journal-title":"Curr. Eye Res."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.optm.2008.10.019","article-title":"Correlation between asthenopic symptoms and different measurements of convergence and reading comprehension and saccadic fixation eye movements","volume":"81","author":"Cohen","year":"2010","journal-title":"Optometry"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Orduna-Hospital, E., Hern\u00e1ndez-Aranda, D., and Sanchez-Cano, A. (2023). Ocular Motility Patterns in Intellectual Disability: Insights from the Developmental Eye Movement Test. Life, 13.","DOI":"10.3390\/life13122360"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"167","DOI":"10.3758\/s13428-020-01388-2","article-title":"The saccade main sequence revised: A fast and repeatable tool for oculomotor analysis","volume":"53","author":"Gibaldi","year":"2021","journal-title":"Behav. Res. Methods"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"120436","DOI":"10.1016\/j.jns.2022.120436","article-title":"Accuracy of clinical versus oculographic detection of pathological saccadic slowing","volume":"442","author":"Grossman","year":"2022","journal-title":"J. Neurol. Sci."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1177\/0883073818807787","article-title":"Subclinical Saccadic Eye Movement Dysfunction in Pediatric Multiple Sclerosis","volume":"34","author":"Yousef","year":"2019","journal-title":"J. Child Neurol."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Wu, F., Fu, R., Ma, Y., Wang, C., and Zhang, Z. (2020). Relationship between speed perception and eye movement\u2014A case study of crash-involved and crash-not-involved drivers in China. PLoS ONE, 15.","DOI":"10.1371\/journal.pone.0229650"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"855","DOI":"10.1097\/OPX.0000000000002090","article-title":"Automated Eye Tracking Enables Saccade Performance Evaluation of Patients with Concussion History","volume":"100","author":"Song","year":"2023","journal-title":"Optom. Vis. Sci."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Cazzoli, D., Antoniades, C.A., Kennard, C., Nyffeler, T., Bassetti, C.L., and M\u00fcri, R.M. (2014). Eye movements discriminate fatigue due to chronotypical factors and time spent on task\u2014A double dissociation. PLoS ONE, 9.","DOI":"10.1371\/journal.pone.0087146"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1055\/s-0042-1760437","article-title":"Oculomotor Findings in Videonystagmography across the Lifespan","volume":"34","author":"Tobener","year":"2024","journal-title":"J. Am. Acad. Audiol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"662","DOI":"10.1017\/S0012162206001393","article-title":"Infant saccades are not slow","volume":"48","author":"Garbutt","year":"2006","journal-title":"Dev. Med. Child Neurol."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Protasevica, D., Kassaliete, E., Klavinska, A., Alecka, M., Berzina, A., Goliskina, V., Koleda, M., Mikelsone, R., Ozola, E., and Ruza, T. (2024). The Computerized Developmental Eye Movement (DEM) Test: Normative Data for School-Aged Children. Vision, 8.","DOI":"10.3390\/vision8030047"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2598","DOI":"10.1016\/j.jcrs.2015.06.029","article-title":"Precision (repeatability and reproducibility) studies and sample-size calculation","volume":"41","author":"McAlinden","year":"2015","journal-title":"J. Cataract Refract. Surg."},{"key":"ref_33","unstructured":"GRANMO (2024). Sample Size and Power Calculator V 7.12, Inst. Munic. d\u2019Investigaci\u00f3 M\u00e9dica. Available online: https:\/\/www.datarus.eu\/aplicaciones\/granmo\/."},{"key":"ref_34","unstructured":"Fran\u00e7ois, P.B.M. (1997). Les techniques d\u2019exploration clinique de la macula. Physiol. de la macula. Techniques Cliniques d\u2019exploration, Masson."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1175","DOI":"10.1007\/s00417-024-06684-7","article-title":"Minimum perceptual time (MPT). Repeatability and reproducibility of variables applied to \u201csports vision\u201d","volume":"263","year":"2025","journal-title":"Graefe\u2019s Arch. Clin. Exp. Ophthalmol."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Nascimento, H., Alvarez-Peregrina, C., Martinez-Perez, C., and S\u00e1nchez-Tena, M.\u00c1. (2021). Vision in futsal players: Coordination and reaction time. Int. J. Environ. Res. Public Health, 18.","DOI":"10.3390\/ijerph18179069"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1111\/j.1475-1313.2008.00583.x","article-title":"Repeatability and agreement in the measurement of horizontal fusional vergences","volume":"28","author":"Antona","year":"2008","journal-title":"Ophthalmic Physiol. Opt."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"275","DOI":"10.1016\/j.optom.2020.05.005","article-title":"The repeatability and reproducibility of four techniques for measuring horizontal heterophoria: Implications for clinical practice","volume":"14","author":"Anstice","year":"2021","journal-title":"J. Optom."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1111\/opo.12341","article-title":"Intra- and inter-examiner repeatability of cycloplegic retinoscopy among young children","volume":"37","author":"McCullough","year":"2017","journal-title":"Ophthalmic Physiol. Opt."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"545","DOI":"10.1097\/MAO.0000000000001014","article-title":"Reliability and Normative Data for the Dynamic Visual Acuity Test for Vestibular Screening","volume":"37","author":"Riska","year":"2016","journal-title":"Otol. Neurotol."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/j.jcm.2016.02.012","article-title":"A Guideline of Selecting and Reporting Intraclass Correlation Coefficients for Reliability Research","volume":"15","author":"Koo","year":"2016","journal-title":"J. Chiropr. Med."},{"key":"ref_42","first-page":"307","article-title":"Statistical methods for assessing agreement between two methods of clinical measurement","volume":"1","author":"Altman","year":"1986","journal-title":"Lancet"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"791","DOI":"10.1007\/s00417-014-2876-z","article-title":"Repeatability of mesopic visual acuity measurements using high- and low-contrast ETDRS letter charts","volume":"253","author":"Barrio","year":"2015","journal-title":"Graefe\u2019s Arch. Clin. Exp. Ophthalmol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1080\/13825585.2014.901290","article-title":"Saccadic eye movements as indicators of cognitive function in older adults","volume":"22","author":"Bowling","year":"2015","journal-title":"Aging Neuropsychol. Cogn."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Orduna-Hospital, E., Navarro-Marqu\u00e9s, A., L\u00f3pez-de-la-Fuente, C., and Sanchez-Cano, A. (2023). Eye-Tracker Study of the Developmental Eye Movement Test in Young People without Binocular Dysfunctions. Life, 13.","DOI":"10.3390\/life13030773"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"100517","DOI":"10.1016\/j.optom.2024.100517","article-title":"Comparison of two visual-verbal tests of ocular motility using an eye-tracker","volume":"17","year":"2024","journal-title":"J. Optom."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"606","DOI":"10.1111\/j.1475-1313.2009.00679.x","article-title":"Intra-examiner repeatability and agreement in accommodative response measurements","volume":"29","author":"Antona","year":"2009","journal-title":"Ophthalmic Physiol. Opt."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"896","DOI":"10.1111\/opo.12829","article-title":"Repeatability of an automated ETDRS contrast threshold measurement","volume":"41","author":"Pang","year":"2021","journal-title":"Ophthalmic Physiol. Opt."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"383","DOI":"10.1111\/opo.13445","article-title":"Repeatability of lipid layer thickness using LipiView\u00ae following removal of contact lenses and its relationship to comfort","volume":"45","author":"Kumar","year":"2025","journal-title":"Ophthalmic Physiol. Opt."}],"container-title":["Journal of Clinical Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-0383\/14\/20\/7170\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T10:36:00Z","timestamp":1760524560000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-0383\/14\/20\/7170"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,10,11]]},"references-count":49,"journal-issue":{"issue":"20","published-online":{"date-parts":[[2025,10]]}},"alternative-id":["jcm14207170"],"URL":"https:\/\/doi.org\/10.3390\/jcm14207170","relation":{},"ISSN":["2077-0383"],"issn-type":[{"value":"2077-0383","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,10,11]]}}}