Dynamic Visual Acuity: Tests, Sports Studies and Training

Updated 2026-10-25

Written by the Optics Trainer team from published research, with every source linked below.

Dynamic visual acuity (DVA) is how clearly you can see detail when there is motion. The term has two meanings. In vestibular care, it is how well you read letters while your head moves, which depends on the vestibulo-ocular reflex (VOR). In sports vision, it is how well you see detail on a moving object, such as a ball. It ends with Fast Pitch, the Optics Trainer game modeled on moving-object DVA.

What is dynamic visual acuity? Two different meanings

Standard eye charts measure static acuity: you and the letters are still. Dynamic visual acuity adds motion, and the two research fields use the term differently.

Head-movement DVA (vestibular): the letters stay still and your head moves. A 2016 study describes it as comparing acuity with the head moving and still, which reflects how well the VOR, the reflex that moves the eyes opposite to the head, keeps the image steady.
Object-motion DVA (sports vision): your head is still and the target moves. Uchida and colleagues defined DVA in 2012 as the ability to see the fine parts of a moving object, and studied it with moving Landolt C rings, a C-shaped target with a gap you name the direction of.
Kinetic visual acuity (KVA): a related Japanese measure in which a Landolt ring approaches you, in one 2013 study at 30 km per hour, rather than moving sideways.

The dynamic visual acuity test for vestibular function

In the bedside version, you read a chart with your head still, then again while an examiner moves your head side to side or up and down, and the number of lines lost is recorded. Computerized versions measure acuity on a screen while the head moves.

Dynamic illegible E test, 1987: none of 110 people with no balance complaints dropped more than one row on a chart of Es with the head moving. The authors wrote that a drop of more than two rows can be regarded as abnormal.
Computerized DVA, 1998: in 42 healthy people and 55 with vestibular loss, aged 19 to 87, Herdman and colleagues reported reliability of 0.87 and 0.83, sensitivity of 94.5% and specificity of 95.2% for telling the groups apart.
Reliability of loss scores can be low: in 2016, a study of 46 healthy adults on a commercial system found poor-to-fair reliability for DVA loss scores, with raw scores more reliable.
Head speed matters: in a 2009 study of 10 people with one-sided vestibular loss, more had abnormal scores as head movement rose from 0.5 to 2 cycles per second, and scores correlated only weakly with caloric testing.

Gaze stabilization exercises and the 2022 guideline

Gaze stabilization exercises ask you to keep your eyes on a target while your head moves. The 2022 clinical practice guideline from the Academy of Neurologic Physical Therapy of the American Physical Therapy Association (APTA) groups them into adaptation exercises, such as VORx1 and VORx2, and substitution exercises.

Based on strong evidence, the guideline says clinicians should offer vestibular rehabilitation to adults with vestibular hypofunction. Based on strong evidence and harm outweighing benefit, it says saccade or pursuit eye exercises done without head movement should not be used to promote gaze stability. Its review of four studies found that eye-only exercises did not help DVA recover. In one trial it summarizes, 12 of 13 people doing gaze stabilization exercises reached normal DVA for their age, compared with none in the control group. The guideline gives minimum home doses for each type of vestibular loss, rated moderate to weak evidence, to be set by the treating clinician.

Our clinic article on gaze stability and VOR testing covers other measures, and our guide to eye tracking exercises covers vestibular rehabilitation trials.

What is dynamic visual acuity in sports? What studies found

Researchers have asked whether athletes see moving targets better, and why.

Selected studies of moving-target DVA in athletes
Study	Who	Task	Result as reported
Ishigaki and Miyao 1993, Percept Mot Skills	53 university athletes, 46 non-athletes	Landolt C moving across a screen, slowing from 300 degrees per second until the gap is seen	No difference with large gaps; athletes saw the two smallest gaps at higher speeds
Uchida 2012, PLoS One	Baseball players and non-athletes	Moving Landolt rings with free eye movement or fixed gaze	Players better with free eye movement; no difference with fixed gaze
Uchida 2013, Med Sci Sports Exerc	Baseball players and non-players	Moving Landolt rings with eye movement recording	Players had faster eye movements at shorter delays; no difference in perceiving moving images on the retina
Hoshina 2013, Clin Ophthalmol	102 Japanese professional baseball players	Static acuity, KVA and sideways DVA	No difference between performance levels; fielders had higher KVA than pitchers

Dynamic visual acuity training and exercises: what trials found

Practice on a DVA task changes scores on that task. In a 1989 study, 54 male college students did four 30-minute practice sessions with moving targets, and their DVA rose, most in those who started lowest. A 1991 study with free head movement found the same pattern. A 2024 study of 58 young adults found a short-term learning effect from simply repeating a moving-target DVA test, with long-term learning rarely observed.

Two controlled trials of broader sports vision programs reported no differences from control groups. In 2001, Abernethy and Wood assigned 40 young people equally to two commercial visual training programs, a reading placebo or physical practice for 4 weeks; some scores changed after training but not differently by group, and the authors found no gains in vision or motor performance beyond test familiarity. In a 2021 randomized, double-blind trial by Shekar, Erickson and colleagues, 32 college baseball and softball players trained three times a week for 3 weeks on a digital program for DVA and depth perception or on a placebo program; there were no significant differences between groups, though DVA and three other measures showed effect sizes of at least 0.5, and 15 of 16 placebo players thought they had done the real training.

In a 2011 study by Appelbaum and colleagues, people who did throwing and catching drills in stroboscopic glasses improved more than controls on central motion sensitivity and a brief attention task, but not on peripheral tasks or multiple-object tracking. Appelbaum and Erickson's review of digital sports vision training describes perceptual learning and virtual reality programs, and a 2021 review by Erickson says which visual factors matter in sport, and how best to assess them, are “the sources of much debate”.

DVA chart and online dynamic visual acuity tests

There is no single DVA chart. Sports studies use moving Landolt C rings, changing speed or size to find the point at which the gap can be named.

We did not find validated norms for online or app-based DVA tests, and the 2024 study shows scores rise with repetition alone. A home score cannot rule out a vestibular problem. Dizziness, vision that bounces when you walk, or sudden imbalance should be checked by a doctor, and sudden symptoms after a head injury need prompt care.

Fast Pitch: a game modeled on moving-target DVA

Fast Pitch is the Optics Trainer game modeled on object-motion DVA in sports vision, in particular the approaching-target kind. A spinning ball looms toward you from a release point, growing as it nears. A ring with one gap rolls into view on its side, faces you briefly near the end of the flight, then rolls away and the ball disappears. You tap the direction the gap pointed.

It keeps the core of a Landolt C DVA task, naming the gap direction on a moving target. What it changes:

The target approaches and spins rather than moving sideways at a fixed speed.
As levels rise, flights get shorter, the ring gets smaller, the spin gets faster, the gap can point more ways, and some pitches curve or break late.
A session is a short timed round, and it scores points rather than recording an acuity value. Any score is a practice result, not a clinical measurement.
It has an optional binocular mode, with red-blue glasses on a phone, tablet or computer, or built in on Meta Quest.

Where Optics Trainer fits

Optics Trainer is a set of vision and brain training games for iPhone, iPad, Android, web browsers and Meta Quest. Fast Pitch is modeled on the moving-target DVA tasks used in sports vision research and challenges you to read a gap on an approaching ball. UFO Bounce, covered in our multiple object tracking guide, and the games in our peripheral vision training guide are other sports and tracking games.

Fast Pitch is not modeled on the vestibular DVA test. It does not ask you to move your head, so it does not test the VOR or gaze stability, is not a gaze stabilization exercise and is not part of vestibular rehabilitation. It was not tested in any of the studies described here. It is not a test or measure, is not a treatment or diagnosis, and is not FDA cleared. We make no claim that it changes acuity, eye movements or sport performance. For clinical measurement of fixation and gaze stability, see Optics Tracker on our clinic site.

Optics Trainer is not a substitute for professional diagnosis or prescribed care. Consult your eye care professional for guidance about your specific condition. The phone and tablet apps start with a 7-day free trial, and a free web account includes 3 plays a day. After that, mobile and web access is $14.99 a month or $149.99 a year, and VR access is $19.99 a month or $199 a year after a 7-day free trial.

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Frequently asked questions

What is dynamic visual acuity?

It is how clearly you see detail when there is motion. In vestibular care, it means reading letters while your head moves. In sports vision, it means seeing detail on a moving object, such as the gap in a moving Landolt C ring.

What does the dynamic visual acuity test show?

The head-movement test compares acuity with the head still and moving, which reflects how well the vestibulo-ocular reflex steadies the eyes. In a 1998 study, a computerized version told healthy people from people with vestibular loss with 94.5% sensitivity and 95.2% specificity.

What is a normal dynamic visual acuity result?

It depends on the test. In one 1987 study, no healthy person lost more than one chart row with the head moving, and the authors treated a drop of more than two rows as abnormal. Computerized systems use their own reference values.

Can you train dynamic visual acuity?

Practice on a moving-target task raised scores on that task in 1989 and 1991 studies. Controlled trials of broader sports vision programs in 2001 and 2021 found no differences from placebo or control groups.

What are gaze stabilization exercises?

They are vestibular rehabilitation exercises in which you keep your eyes on a target while your head moves. The 2022 APTA guideline recommends them for vestibular hypofunction and says eye exercises without head movement should not be used for gaze stability.

Why do baseball players have better dynamic visual acuity?

Two studies by Uchida and colleagues found players' advantage disappeared when they had to keep their eyes still, and that they made faster eye movements at shorter delays. The authors linked it to tracking the target with the eyes.

Is there a dynamic visual acuity game?

Optics Trainer's Fast Pitch is modeled on moving-target DVA: you tap the direction of a gap on a spinning ball that flies toward you. It does not test the VOR or gaze stability, was not tested in these studies, and is not a test or treatment.

Sources

Related guides

Try Fast Pitch

Fast Pitch, Optics Trainer's moving-target game, asks you to read the gap on a spinning ball as it flies toward you, with an optional red-blue glasses mode. Play it on phone, tablet, web and Meta Quest. The phone and tablet apps start with a 7-day free trial.

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