{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,14]],"date-time":"2026-06-14T14:20:05Z","timestamp":1781446805549,"version":"3.54.1"},"reference-count":14,"publisher":"Aerospace Medical Association","issue":"11","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["aerosp med hum perform"],"published-print":{"date-parts":[[2022,11,1]]},"abstract":"<jats:p><jats:bold>INTRODUCTION:<\/jats:bold> Dynamic visual acuity (DVA) refers to the ability of the eye to discern detail in a moving object and plays an important role whenever rapid physical responses to environmental changes are required, such as while performing tasks onboard a space shuttle. A significant\n decrease in DVA has previously been noted after astronauts returned from long-duration spaceflight (0.75 eye chart lines, 24 h after returning from space). As part of a NASA-funded, head-mounted multimodal visual assessment system for monitoring vision changes in spaceflight, we elaborate\n upon the technical development and engineering of dynamic visual acuity assessments with virtual reality (VR) technology as the first step in assessing astronaut performance when undergoing G-transitional effects. We also report results from an early validation study comparing VR DVA assessment\n with traditional computer based DVA assessment.<jats:bold>METHODS:<\/jats:bold> Various VR\/AR headsets have been utilized to implement DVA tests. These headsets include HTC Vive Pro Eye system. Epic\u2019s game engine UnrealEngine 4 Version 4.24 was used to build the framework and SteamVR was used to\n experience virtual reality content. Eye tracking technology was used to maintain fixation of the participant. An early validation study with five participants was conducted comparing this technology versus traditional DVA with a laptop.<jats:bold>RESULTS:<\/jats:bold> The head-mounted technology developed\n for assessing DVA changes during G-transitions is fully functional. The results from the early validation study demonstrated that the two DVA tests (laptop-based and VR) indicated a strong association between both methods (Pearson correlation coefficient of 0.91). A Bland-Altman plot was employed\n to assess levels of agreement, with all data points falling within the limits of agreement.<jats:bold>DISCUSSION:<\/jats:bold> The results from this early validation study indicate that head-mounted DVA assessment performs similarly to traditional laptop-based methods and is a promising method for assessing\n DVA during spaceflight, particularly in G-transitions. Future studies are required for further assessment of validation and reliability of this technology. With its ease of use, accessibility, and portable design, VR DVA has the potential in the near-future to replace conventional methods\n of assessing DVA. The technology will likely be an important aspect to help monitor functionality and safety during interplanetary missions where astronauts are exposed to G-transitions.<jats:bold>Waisberg E, Ong J, Zaman N, Kamran Sa, Lee AG, Tavakkoli A. <jats:italic>Head-mounted dynamic visual acuity\n for G-transition effects during interplanetary spaceflight: technology development and results from an early validation study<\/jats:italic>. Aerosp Med Hum Perform. 2022; 93(11):800\u2013805.<\/jats:bold><\/jats:p>","DOI":"10.3357\/amhp.6092.2022","type":"journal-article","created":{"date-parts":[[2022,10,30]],"date-time":"2022-10-30T04:33:56Z","timestamp":1667104436000},"page":"800-805","source":"Crossref","is-referenced-by-count":36,"title":["Head-Mounted Dynamic Visual Acuity for G-Transition Effects During Interplanetary Spaceflight: Technology Development and Results from an Early Validation Study"],"prefix":"10.3357","volume":"93","author":[{"given":"Ethan","family":"Waisberg","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua","family":"Ong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nasif","family":"Zaman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sharif Amit","family":"Kamran","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew G.","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alireza","family":"Tavakkoli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1911","reference":[{"key":"B1","year":"2015"},{"key":"B2","volume-title":"Space physiology","year":"2006"},{"key":"B3","article-title":"Exploratory study on user\u2019s dynamic visual acuity and quality perception of impaired images","year":"2022"},{"key":"B4","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.actaastro.2021.08.023","article-title":"Human physiology adaptation to altered gravity environments","volume":"189","year":"2021","journal-title":"Acta Astronaut."},{"issue":"1\u20132","key":"B5","first-page":"77","article-title":"Space motion sickness: incidence, etiology, and countermeasures","volume":"129","year":"2006","journal-title":"Auton Neurosci."},{"issue":"1","key":"B6","doi-asserted-by":"crossref","first-page":"15","DOI":"10.3233\/VES-200782","article-title":"Leveraging virtual reality for vestibular testing: clinical outcomes from tests of dynamic visual acuity","volume":"32","year":"2022","journal-title":"J Vestib Res."},{"issue":"5","key":"B7","doi-asserted-by":"crossref","first-page":"1443","DOI":"10.1016\/j.survophthal.2022.04.004","article-title":"Neuro-ophthalmic imaging and visual assessment technology for spaceflight associated neuro-ocular syndrome (SANS)","volume":"67","year":"2022","journal-title":"Surv Ophthalmol."},{"issue":"1","key":"B8","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1038\/s41526-022-00222-7","article-title":"Terrestrial health applications of visual assessment technology and machine learning in spaceflight associated neuro-ocular syndrome","volume":"8","year":"2022","journal-title":"NPJ Microgravity."},{"issue":"3","key":"B9","doi-asserted-by":"crossref","first-page":"6","DOI":"10.1167\/jov.22.3.6","article-title":"Contributed session I: multi-modal visual assessment system for monitoring Spaceflight Associated Neuro-Ocular Syndrome (SANS) during long duration spaceflight","volume":"22","year":"2022","journal-title":"J Vis."},{"issue":"2","key":"B10","doi-asserted-by":"crossref","first-page":"e0172061","DOI":"10.1371\/journal.pone.0172061","article-title":"Distinct eye movement patterns enhance dynamic visual acuity","volume":"12","year":"2017","journal-title":"PLoS One."},{"issue":"4","key":"B11","doi-asserted-by":"crossref","first-page":"463","DOI":"10.3357\/ASEM.2928.2011","article-title":"Dynamic visual acuity during walking after long-duration spaceflight","volume":"82","year":"2011","journal-title":"Aviat Space Environ Med."},{"issue":"4","key":"B12","doi-asserted-by":"crossref","first-page":"249","DOI":"10.3233\/VES-200710","article-title":"Sport-specific differences in dynamic visual acuity and gaze stabilization in Division-I collegiate athletes","volume":"30","year":"2020","journal-title":"J Vestib Res."},{"key":"B13","doi-asserted-by":"crossref","first-page":"321","DOI":"10.3389\/fneur.2019.00321","article-title":"Vestibulo-ocular responses and dynamic visual acuity during horizontal rotation and translation","volume":"10","year":"2019","journal-title":"Front Neurol."},{"key":"B14","year":"2022"}],"container-title":["Aerospace Medicine and Human 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