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Vision and handball, 10 studies: task-dependent visual differences, gains mostly measured on tests, a single trial on a defensive test.
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In brief. Ten handball studies, almost all small, show visual differences between handball players and non-athletes that depend on the task, and six-week programs that mostly improve test measures. Only one randomized trial measures a specific defensive test; none measures the match. Updated November 3, 2026.
Hello to you, the movement professional,
In Budapest, Petro's team brought together two families of athletes with opposite visual demands: shooters, whose discipline narrows attention onto a small target, and handball players, who have to monitor a wide field. While each one carried out a pursuit task, checkerboards unrelated to the task appeared at the sides of the screen, and from time to time a different checkerboard broke the series. The electroencephalogram was watching for visual mismatch negativity, a wave that signals the automatic detection of an unexpected change. It was larger in the handball players (Petro et al., 2021).
Picture your back-court defender, low stance, arms up, the attacker in front of him and the pivot shifting behind his back. What moves at the edge of his gaze matters as much as what he fixates. The study design, a one-time comparison between two groups, does not let us say whether this sensitivity is acquired on the court or whether the court retains those who already have it. And out of ten handball studies, only one measures a specific defensive test; none measures the match. So what can be trained, and with what certainty?
The corpus is thin. The inventory assembled by LabO RNP on athletes' vision contains 22 studies that cite handball: 10 in its first version of 509 studies, 12 added by targeted PubMed searches. Nine concern the goalkeeper and the 7-meter throw duel, analyzed in our article on the goalkeeper's gaze; one review on referees' gaze, all sports combined, belongs in another article. That leaves ten primary studies on the court player and the handball referee: five without a training program and five interventions, plus two reviews that also deal with handball.
These studies rarely measure the same thing: motor reaction time to light, multiple object tracking (keeping your eye on several moving targets among decoys), visual evoked potentials, gaze filmed by eye tracking, reactive agility. The latter, a movement triggered by an unpredictable signal, is the closest to defending, since the defender never knows in advance which way the attacker will go.
Known sample sizes range from 16 to 412 participants, but most of the groups compared include fewer than 30 people. To fill the gaps, we add eight publications from outside handball, flagged as transferable: six trials in soccer or volleyball, one meta-analysis in team sports and one opinion article.
Study | Population (n) | What was measured | Result | Level of evidence |
|---|---|---|---|---|
Handball players and sport shooters (n not specified in the abstract) | Visual mismatch negativity to peripheral stimuli, in EEG | Larger wave in handball players | Weak, cross-sectional | |
Handball players and non-athletes (n not specified in the abstract) | Tracking of 3 to 5 targets among 10 objects, identical or different; eye tracking | Same tracking accuracy; gaze more oriented toward the targets in players | Weak, cross-sectional | |
19 players (soccer, basketball, handball) and 16 sedentary individuals | Tracking of 3 balls out of 8 for 10 s, on a platform with three levels of stability | Players better at high stability (d = 0.96) and medium stability (d = 0.94), no gap at low stability | Weak, cross-sectional | |
16 elite university handball players, crossover design | Decision-making, visual search and reaction time after mental fatigue | Decision-making not impaired; visual reaction time delayed after social media, auditory unchanged; gaze globally stable | Weak | |
51 referees (31 top-level, 20 lower-level) | Fixations and saccades on match clips, accuracy of decisions | Top level more accurate (d = 0.68; 1.41 on sanctions), gaze with no significant difference | Weak, on video | |
Meta-analysis, 22 studies, 1,113 team-sport athletes including handball | Correlations between visual abilities and specific performance | Object tracking r = 0.54; visual attention r = 0.39; visual search r = 0.36; depth perception r = 0.09, not significant | Moderate, correlations |
On object tracking, the two studies that include handball players contradict each other. In Zwierko, team-sport players beat sedentary individuals on a task that has nothing athletic about it, and the authors see in this a transfer of expertise to non-specific domains. Yet the advantage disappears on the most unstable platform, and tracking drops for everyone when the footing gives way: a link between visual tracking and postural control whose mechanism the study does not give. In Styrkowiec, handball players track the targets exactly as well as non-athletes, and the authors conclude that the gap between athletes and non-athletes is "highly specific to the skills demanded by the athletes' sport," in other words closely tied to the abilities their sport requires.
Two results pull gaze apart from performance. Among Świdwa's referees, the accuracy of decisions separates the levels while fixations and saccades do not differ. Among Styrkowiec's players, it is the reverse: gaze differs, the score does not. On a larger scale, Yang's meta-analysis links performance to visuo-cognitive abilities (tracking, attention, search) far more than to the only basic perceptual ability analyzed, depth perception, on correlational evidence that the authors judge limited. If gaze alone does not give away the expert, what did the training programs actually change?
Study | Population (n) | Published protocol | Measure | Result | Transfer to the field | Level of evidence |
|---|---|---|---|---|---|---|
40 highly trained handball players, male and female, 20 versus 20, randomized | 6 weeks, 2 sessions of 40 min per week of motor-cognitive training in place of part of the handball; session content not detailed in the abstract | Balance (Y-Balance Test), reactive agility, dual task, executive functions, modified Y-agility test specific to handball | Superior to control on all measures; ηp² = 0.27 in reactive agility, 0.51 on the specific test | Measured and positive on a specific defensive test; match not measured | Moderate | |
22 elite handball players, randomized | 6 weeks of handball-specific tasks for both groups, under strobe lighting for the experimental group only | Latency and amplitude of the P100 wave of visual evoked potentials, dominant eye, non-dominant eye and binocular | Latency shortened for the dominant eye and in binocular vision, especially outside the fovea (ηp² from 0.14 to 0.21 depending on the condition), effect clearer right after than at 4 weeks | Not measured | Moderate to weak | |
28 players under 18, competitive level | Two baseline measures 6 weeks apart, then 6 sessions of about 15 min built into training: stroboscopy, vergence in virtual reality, reactive lights | Accommodative facility, manual and decision reaction times, responses in the peripheral field, binocular vision | Accommodation and several reaction times improved; binocular alignment, phoria and stereopsis unchanged | Not measured | Weak, no control group (double baseline measure) | |
412 players, including 140 handball players, 146 basketball players and 126 volleyball players | 6 weeks, 2 sessions of 30 min per week, 15 manual reaction exercises to light stimuli involving peripheral vision | Four manual reaction time tests to light | Progress in all groups, clearest in handball players on the one-sided tests | Not measured | Weak, no control | |
24 female team-sport students (soccer, basketball, handball), 12 drawn by lot | 8 weeks, 3 sessions of 20 min per week of eye exercises | Phoria and fusional vergence (synoptophore, Maddox method) | 3 variables out of 6 improved, gain maintained 4 weeks later | Not measured | Weak |
Jedziniak's trial is the only one that touches defense. The program is motor-cognitive rather than visual: the abstract does not describe the session content, its measures concern balance, dual task and executive functions, and no eye exercise is mentioned. The sessions replaced part of the handball while the control group continued its usual training, with nothing else new, and the specific test is probably close to what was trained. The result is real, but it describes an intermediate transfer, on a played and supervised test, far from the match duel.
Zwierko's trial looks further upstream. The P100 wave appears about a tenth of a second after a stimulus, recorded over the primary visual cortex; a shorter latency signals faster early visual processing. Six weeks of stroboscopy shorten it, especially in extra-foveal vision, but the effect is less clear four weeks after stopping, and no game measure accompanies the marker. The two trials without a control group are more fragile. In Badau, usual training or repetition of the test could explain the progress, and the percentages in the abstract do not match the sample sizes. Bernárdez-Vilaboa limits this risk with two baseline measures taken six weeks apart, which does not replace a control group. Badau's basketball players fall under our article on visual training in basketball. What becomes of these gains when they are measured on a played movement? Handball alone does not allow us to answer, hence the detour through other team sports.
The studies that follow are not about handball players. We keep them because they measure what the handball corpus lacks, reactive agility and decision-making after training, with a comparison group.
Study | Sport (n) | Published protocol | Result | Transfer to the field |
|---|---|---|---|---|
University soccer (36, 18 versus 18) | 6 weeks, 3 sessions per week of identical soccer exercises, stroboscopic glasses versus clear glasses of similar appearance; blinded assessors | Greater gains on all five measures, including reactive agility with and without the ball | Positive field test; retention and match not measured | |
Zwierko M 2023 and 2024 | Volleyball, 50 young players, probably the same sample | 6 weeks of volleyball exercises, with or without strobe | Reactive agility improved right after (d = 0.49), attenuated 4 weeks later; visuomotor reaction index d = 0.87 | Positive field test in the short term |
Amateur soccer (42), three groups | 6 weeks: change of direction, agility, or agility with multiple object tracking | Agility and agility with tracking progress on the Random Star Run and on dribbling with a cognitive task; no added benefit of object tracking; passing test unchanged | Partial | |
University soccer (31) | 10 sessions of 3D object tracking over 4 weeks versus a control task | The trained task progresses (ηp² = 0.43), decision-making does not | Measured and null | |
Women's volleyball (51), three groups | 6 weeks of visual training outside a sport context, versus classic volleyball training | Cognitive tests improved by visual training; volleyball skill accuracy better with classic training | Measured and unfavorable to visual training outside context | |
Meta-analysis, 22 team-sport studies, 45 effect sizes | Perceptual-cognitive training | Effect size of 1.51 in the laboratory, 0.65 in real play | Transfer present but reduced |
Weng and Zwierko build the glasses into exercises from the sport itself, as with the handball players of Zwierko 2024; protocols and trials with no effect are detailed in our synthesis on stroboscopic glasses. Friebe sheds light on Jedziniak: reactive agility progresses when decision-making is put into it, and object tracking added on top brings nothing measurable. Our article on athletes' neurocognitive training poses the same question of transfer across all sports.
Measure the distance between the exercise and the game, and the results sort themselves. On a task that resembles the exercise, the gain is frequent: reaction time to light, P100 wave, object tracking. On a played but supervised test, it appears in four trials with a comparison group: Jedziniak's defensive test, Weng's reactive agility with the ball, that of Zwierko's volleyball players, Friebe's Random Star Run. Far transfer, the duel in a match, was not measured by any trial cited here.
The null trials count as much as the others: no decision-making gain after 3D object tracking (Harenberg 2022), visual training outside context that serves the volleyball movement less than volleyball itself (Formenti 2019), no added benefit of object tracking on agility (Friebe 2024). In an opinion article, Fransen (2024) defends a clear position: no evidence today supports a far transfer from general perceptual or cognitive training to sports performance.
These data sketch a plausible hypothesis, not a demonstrated one: the more an exercise keeps perception coupled to action, the more likely it is to carry down into the game. This is the logic of perception-action coupling and of representative design, where you train under conditions that resemble those of the match.
Study A | Relationship | Study B |
|---|---|---|
Zwierko T 2024 (handball, P100) | corresponds to the only electrophysiological study cited by | Dong 2026, a narrative review that proposes four neural systems, including the dorsal pathway of vision, without direct confirmation |
Jedziniak 2026, Zwierko T 2015, 2022 and 2024, Zwierko M 2023 and 2024 | same network of authors (Szczecin, Wrocław) | Jedziniak co-signs the 2024 handball trial and the two volleyball trials; Teresa Zwierko co-signs Jedziniak 2026 |
Zwierko M 2023 | probably the same sample as | Zwierko M 2024: same authors, 50 young players, same sex split, same mean age, same duration |
Friebe 2024 | points in the same direction as | Jedziniak 2026: agility with decision-making progresses, added object tracking brings nothing more; Hülsdünker co-signs both |
Weng 2026 | partly the same authors as | Dong 2026 (Weng, Gao, Dong and Wang sign both) |
Zwierko T 2022 (players better at object tracking) | contradicts | Styrkowiec 2024 (no tracking advantage in handball players) |
Yang 2026 (object tracking linked to performance, r = 0.54) | is qualified by | Harenberg 2022: training object tracking did not improve decision-making |
Świdwa 2025 | joins, in the opposite direction | Styrkowiec 2024: gaze and performance dissociate in both studies |
Bernárdez-Vilaboa 2026 and Badau 2023 | share a limitation | no control group; Bernárdez-Vilaboa's double baseline measure partly controls for test repetition, Badau has no comparison point |
Zhu 2024 | frames | the whole: in team sports, the effect in real play is worth less than half the effect in the laboratory |
Two reservations weigh on this map. Three of the five trials in the handball table and the two volleyball trials come from a single network of Polish authors, so their concordant results are not worth independent replications. Dong's mechanistic review rests its electrophysiological part on a single study, whose description matches that of Zwierko's handball players: the neural model it proposes remains to be confirmed.
Established, on small samples: handball players, or the team-sport players who include them, stand apart from sedentary people or other athletes on some tasks (automatic peripheral detection, object tracking on a stable base) and not on others; in controlled trials, six weeks of stroboscopy or motor-cognitive work improve test measures. Debated: the gains from reactive lights, measured without a control group; the duration of effects, less clear four weeks after stopping in two trials; the share of selection and training in the gaps between groups; the passage from a supervised defensive test to the real duel. Extrapolation: that visual training makes a better defender in a match. No one can promise you that a player who is faster to a light will intercept more balls.
The most favorable hypothesis can be put to the test. Take a team-randomized trial, with equal training volume between groups, that builds six weeks of motor-cognitive work into defense and measures defensive duels won and shots conceded in official matches, with retention at two months. If it finds no difference, the idea that this work improves defense in handball no longer holds.
In the trial by Zwierko et al. (2015), the baseline examination of 24 team-sport players showed exophoria, a latent tendency of the eyes to deviate outward, as the most frequent binocular vision gap, with low fusional vergence amplitudes. If your athlete reports double vision, persistent blur, headaches during effort or vertigo, visual training waits. They first see an ophthalmologist, then an orthoptist in France, or an optometrist in Switzerland or the United States. LabO RNP is neither medical nor paramedical, and is added as a complement to a care pathway, never in its place. LabO RNP works with optometrists; the curriculum was built with them.
For LabO RNP, the eyes remain a point of entry. What we teach movement professionals is the sensory aspects of movement and the whole sensorimotor loop: how what the athlete perceives organizes what he does. The handball defender gives a clear picture of it, since his footing and his arm are tuned to an attacker he reads in motion, and Zwierko's 2022 study already shows visual tracking faltering when the footing gives way. Oculomotor exercises in the warm-up are the subject of a separate article, and the map of evidence in sports vision places handball among all the families of visual training.
Visual measures move after six weeks: P100 wave latency under strobe lighting in a trial of 22 elite players (Zwierko et al., 2024), reaction time to light (Badau et al., 2023), accommodative facility in 28 young players (Bernárdez-Vilaboa et al., 2026). These gains remain test gains, and two of these three studies have no control group.
Only one randomized trial measures a specific defensive test. In 40 highly trained players, six weeks of motor-cognitive work, two 40-minute sessions per week, do better than usual training on that test and on reactive agility (Jedziniak et al., 2026). The program is more motor-cognitive than visual, and defense in a match was not measured.
Compared with shooters, handball players more strongly and automatically detect a change in the periphery (Petro et al., 2021). Compared with non-athletes, they track multiple targets equally well, with gaze more oriented toward them (Styrkowiec et al., 2024). The advantage depends on the task, and these comparisons do not say whether it comes from training or from selection.
In 22 elite handball players, six weeks of stroboscopy built into handball exercises shorten the latency of an early visual wave, especially right after the program (Zwierko et al., 2024). Reactive agility progresses in soccer and volleyball trials (Weng et al., 2026; Zwierko M et al., 2023). None of these trials measures the match.
Yes. Double vision, persistent blur, headaches during effort or vertigo come before any visual training: the ophthalmologist first, then the orthoptist in France or the optometrist in Switzerland and the United States. LabO RNP is neither medical nor paramedical, and is added as a complement to a care pathway, never in its place.
A defender reads an attacker who moves, and it is against him that any gain obtained in front of a light or a screen must ultimately be verified.
👉 I want to understand what my defender perceives before correcting his movement.
By the LabO RNP team
Method. Inventory of 22 studies citing handball, built on November 3, 2026: 10 from the LabO RNP inventory on athletes' vision (509 studies, PubMed and vault notes), 12 added the same day by targeted PubMed searches on team sports. 9 studies on the goalkeeper and the 7-meter throw are treated in a dedicated article, one review on referees' gaze in another; 10 primary studies and 2 reviews are analyzed here, with 8 publications from outside handball presented as transferable. Concussion is outside this article. Every PMID and every DOI was verified against the PubMed record on November 3, 2026.
Badau D, Stoica AM, Litoi MF, Badau A, Duta D, Hantau CG, Sabau AM, Oancea BM, Ciocan CV, Fleancu JL, Gozu B (2023). The Impact of Peripheral Vision on Manual Reaction Time Using Fitlight Technology for Handball, Basketball and Volleyball Players. Bioengineering (Basel), 10(6). PMID 37370628. doi:10.3390/bioengineering10060697
Bernárdez-Vilaboa R, Cedrún-Sánchez JE, Burgos-Postigo S, González-Jiménez R, Otero-Currás C, Povedano-Montero FJ (2026). Sensor-Based and VR-Assisted Visual Training Enhances Visuomotor Reaction Metrics in Youth Handball Players. Sensors (Basel), 26(8). PMID 42076664. doi:10.3390/s26082555
Dong X, Gao D, Gao Y, Guo Y, Hou T, Weng C, Wang J, Zhou X, Hu Z (2026). Stroboscopic visual training and the brain: a narrative review of neural mechanisms underlying perceptual-cognitive adaptation in interceptive sports. Front Neurosci, 20, 1881779. PMID 42583158. doi:10.3389/fnins.2026.1881779
Formenti D, Duca M, Trecroci A, Ansaldi L, Bonfanti L, Alberti G, Iodice P (2019). Perceptual vision training in non-sport-specific context: effect on performance skills and cognition in young females. Sci Rep, 9(1), 18671. PMID 31822740. doi:10.1038/s41598-019-55252-1
Fransen J (2024). There is No Supporting Evidence for a Far Transfer of General Perceptual or Cognitive Training to Sports Performance. Sports Med, 54(11), 2717-2724. PMID 38907178. doi:10.1007/s40279-024-02060-x
Friebe D, Banzer W, Giesche F, Haser C, Hülsdünker T, Pfab F, Rußmann F, Sieland J, Spataro F, Vogt L (2024). Effects of 6-Week Motor-Cognitive Agility Training on Football Test Performance in Adult Amateur Players - A Three-Armed Randomized Controlled Trial. J Sports Sci Med, 23(2), 276-288. PMID 38841643. doi:10.52082/jssm.2024.276
Harenberg S, McCarver Z, Worley J, Murr D, Vosloo J, Kakar RS, McCaffrey R, Dorsch K, Höner O (2022). The effectiveness of 3D multiple object tracking training on decision-making in soccer. Sci Med Footb, 6(3), 355-362. PMID 35862166. doi:10.1080/24733938.2021.1965201
Jedziniak W, Panek K, Zwierko T, Hülsdünker T (2026). Motor-cognitive training improves performance in a handball-specific defense test. Psychol Sport Exerc, 88, 103254. PMID 42665031. doi:10.1016/j.psychsport.2026.103254
Kim J, Yook D, Han S (2026). The Impact of Mental Fatigue on Decision-Making Abilities, Visual Search Strategies, and Simple Reaction Time in Handball Players: A Randomized Crossover Study. Sports (Basel), 14(4). PMID 42043060. doi:10.3390/sports14040128
Petro B, Lénárt Á, Gaál ZA, Kojouharova P, Kökény T, Ökrös C, Czigler I (2021). Automatic detection of peripheral stimuli in shooters and handball players: an event-related potential study. Exp Brain Res, 239(5), 1531-1538. PMID 33751157. doi:10.1007/s00221-021-06071-2
Styrkowiec P, Czyż SH, Hyönä J, Li J, Oksama L, Raś M (2024). Gaze Behavior and Cognitive Performance on Tasks of Multiple Object Tracking and Multiple Identity Tracking by Handball Players and Non-Athletes. Percept Mot Skills, 131(3), 818-842. PMID 38437881. doi:10.1177/00315125241235529
Weng C, Gao D, Dong X, Xu S, Jiang J, Wang J (2026). Effects of stroboscopic vision training on visuomotor reaction and soccer-specific reactive agility in male collegiate soccer players: a randomized controlled intervention study. Front Physiol, 17, 1897512. PMID 42548645. doi:10.3389/fphys.2026.1897512
Yang M, Guo Y, Yang F, Zhao K (2026). Exploring the association between visual skills and sport-specific performance in team athletes: a systematic review and meta-analysis. Front Physiol, 17, 1797347. PMID 41983007. doi:10.3389/fphys.2026.1797347
Zhu R, Zheng M, Liu S, Guo J, Cao C (2024). Effects of Perceptual-Cognitive Training on Anticipation and Decision-Making Skills in Team Sports: A Systematic Review and Meta-Analysis. Behav Sci (Basel), 14(10). PMID 39457791. doi:10.3390/bs14100919
Zwierko M, Jedziniak W, Popowczak M, Rokita A (2023). Effects of in-situ stroboscopic training on visual, visuomotor and reactive agility in youth volleyball players. PeerJ, 11, e15213. PMID 37250711. doi:10.7717/peerj.15213
Zwierko M, Jedziniak W, Popowczak M, Rokita A (2024). Effects of six-week stroboscopic training program on visuomotor reaction speed in goal-directed movements in young volleyball players: a study focusing on agility performance. BMC Sports Sci Med Rehabil, 16(1), 59. PMID 38424539. doi:10.1186/s13102-024-00848-y
Zwierko T, Lesiakowski P, Redondo B, Vera J (2022). Examining the ability to track multiple moving targets as a function of postural stability: a comparison between team sports players and sedentary individuals. PeerJ, 10, e13964. PMID 36071825. doi:10.7717/peerj.13964
Zwierko T, Jedziniak W, Domaradzki J, Zwierko M, Opolska M, Lubiński W (2024). Electrophysiological Evidence of Stroboscopic Training in Elite Handball Players: Visual Evoked Potentials Study. J Hum Kinet, 90, 57-69. PMID 38380298. doi:10.5114/jhk/169443
Zwierko T, Puchalska-Niedbał L, Krzepota J, Markiewicz M, Woźniak J, Lubiński W (2015). The Effects of Sports Vision Training on Binocular Vision Function in Female University Athletes. J Hum Kinet, 49, 287-96. PMID 26925183. doi:10.1515/hukin-2015-0131
Świdwa J, Klatt S, Kantanista A (2025). Gaze behavior and decision-making among handball referees: exploring gender and expertise differences. PeerJ, 13, e19401. PMID 40386242. doi:10.7717/peerj.19401
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