Vision & visual processing

Saccades explained simply – why gaze shifts matter for reading and orientation

Tino Both · 08 Jul 2026 · 7 min read

Briefly explained: Saccades are rapid gaze shifts from one target to the next. You need them for reading, searching and orientation. What matters is not looking back and forth as often as possible: gaze needs to select the appropriate target, reach it precisely and become steady there again.

Do gaze shifts or reading quickly become demanding?If vision and the eyes have already been checked, but switching between targets takes effort, we can consider the specific demand together. In the initial consultation, we clarify whether a functional assessment in Vilshofen fits your concern.

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Your eyes do not glide evenly along a line of text

Reading feels as if gaze simply follows the sentence. In fact, brief gaze shifts and holding phases alternate. During the holding phases, information is taken in; the next jump makes a new area accessible. Looking from your smartphone to the clock or searching for a product on a shelf also requires these target changes.

A saccade differs from calmly tracking a moving ball. In smooth pursuit, a moving target stays in view. In a saccade, gaze rapidly relocates elsewhere. The distinction helps because the two tasks create different demands.

What makes a good gaze shift

The speed of the actual jump is only one part of the task. It must first be clear which target is relevant. The jump then needs appropriate planning. After landing, gaze should be able to take in information. The interaction of target selection, accuracy and subsequent steady gaze is often more interesting in everyday life than the highest possible exercise speed.

Three questions instead of ‘can you move your eyes?’Is the right target selected? A clear instruction is easier than searching among several similar symbols.

Does gaze land appropriately? Are several corrections needed, or does the target change work directly?

Does the task remain comfortable? Frequent blinking, effort, accompanying head movement or declining accuracy can prompt closer examination of conditions. One observation does not yet explain the entire difficulty.

Examination of target accuracy uses two gaze targets, for example. This is also described by gesund.bund.de: saccades – target accuracy. In my functional work, I am additionally interested in translating this task into your actual demand: does it concern reading, screen work, orientation or sporting decisions?

Why ‘losing the line’ is not automatically a saccade problem

Someone who loses their place while reading may have gaze control difficulties. But text difficulty, attention, fatigue or problems with binocular near vision can also be involved. Children additionally need to learn to decode words. Gaze control and learning to read should therefore not be equated.

One example of this necessary separation comes from a study reported by the National Eye Institute (2019): distinguishing visual function and reading performance: treatment of convergence insufficiency could improve visual function, but in this study provided no additional advantage in standardised reading tests compared with the comparison treatment. The study did not examine saccade training. It shows why a visual goal and a learning goal should each be assessed appropriately.

How a finding becomes an assessable task

Suppose you struggle to find the right place again when switching between two screens. A pure speed test would then be too limited. Are targets at different distances? Does the head also need to turn? Is the information on the second screen dense or difficult to take in? I first break down the situation enough to assign a change meaningfully.

One possible assessment: first two clear targets, then more choiceInitially, two clearly recognisable targets are placed at a comfortable distance. Head position, target distance and switching direction remain defined. We observe accuracy, corrections, subsequent steady gaze and your visual impression.

If this simple task works well, an additional selection rule may follow. If it then becomes difficult, that provides different information from a direct switch already being effortful. We then test a selected input and repeat the same starting task, rather than immediately using an easier variation that works better anyway.

Practising more slowly does not mean artificially slowing the gaze shiftWith saccades, we can mainly allow more time between jumps. Gaze can switch rapidly; time then remains to perceive the new target clearly. This differs from smooth pursuit in slow motion.

What I assess more closely in a gaze shift showing a findingFor an additional stimulus assessment, I use an indicator muscle that can be tested reliably without pain. It does not have to belong to the symptomatic region. I narrow down whether a particular gaze direction is difficult or only repeated switching between two targets. The specific question – here, a clearly defined gaze shift direction or target-switching task – is then assessed through a defined stimulus or suitable contacts.

If this shows an unphysiological inhibition according to the criteria of this testing method, I look for an additional input that changes the response. We repeatedly compare stimulus alone and stimulus plus solution input. The method’s integration step only follows when this comparison is understandable. I then reassess the original stimulus without the additional solution input, followed by the gaze shifts and relevant everyday task.

This keeps the internal test response connected to the result you can feel. Repeatability, tolerability and development in everyday life also matter for further support.

When training makes sense

In training, I proceed gradually: first recognisable targets and understandable switches, then specifically greater demand. Distance, direction, frequency or a decision rule can be changed, for example. If everything becomes harder at once, it is difficult to recognise which adjustment helped.

Even an initially successful exercise needs to fit your everyday life. Better target accuracy while sitting is a useful intermediate step. Whether screen switching, reading or orientation benefits is considered separately. With symptoms, the task is simplified or paused, rather than pushed through at speed.

What you can observe yourself – and when assessment takes priority

Comparing situations that already occur is helpful: does only densely printed text become demanding, or looking around too? Is near vision harder than distance vision? Does a break change anything? Note these patterns without testing yourself through rapid gaze shifts.

New double vision, suddenly restricted eye movements or newly markedly changed vision need medical assessment. With additional acute signs such as speech disturbance, paralysis or severe walking unsteadiness: 112. For persistent near-vision strain, ophthalmology and orthoptics can be suitable contacts.

Frequently asked questions about saccades

Are saccades and smooth pursuit the same?No. Saccades move gaze rapidly to a new location. Smooth pursuit keeps a moving target in view. Both work together in everyday life.

Can I simply train saccades faster?More speed is not automatically better. Recognising targets, arriving precisely and continuing to see comfortably take priority. Appropriate progression follows the task and your course.

Are backward jumps during reading always unusual?No. We also jump back to understand a sentence or check information again. Frequently losing your place and symptoms are reasons for closer consideration, but not a finished explanation.

Does this help children too?If visual comfort or gaze control shows difficulties, a suitable functional perspective may be interesting as an addition. Ophthalmological assessment, orthoptics and necessary reading support are not set against each other.

Gaze should arrive – not just move quickly

In everyday life, what matters is whether you find information reliably and take it in comfortably. I base test and exercise selection on this. The appropriate question is therefore not ‘how many gaze shifts can I manage?’ but ‘which gaze task would I like to manage more easily again?’

Would you like to understand your specific visual task more closely?Whether screen switching, reading or orientation: in the free conversation, we discuss everyday life and a possible starting point for functional assessment in Vilshofen.

Arrange an initial consultation about visual processing →
The initial telephone consultation is free.