Cerebral Palsy and Vision Problems: A Parent Guide

Vision problems are one of the most common and most frequently missed aspects of cerebral palsy care. Up to 75% of children with CP have some form of visual difficulty — yet many families spend years managing behaviour challenges, learning difficulties, and therapy plateaus without knowing that vision is an underlying factor. If you have been told your child has CP and nobody has yet spoken specifically about vision, this guide is worth reading before your next appointment.

Why Cerebral Palsy So Often Affects Vision

The brain injury that causes cerebral palsy does not affect only the motor pathways. CP results from damage to or disruption of the developing brain, and the visual processing centres — particularly in the occipital and parietal lobes — are frequently involved.

The most common vision condition in cerebral palsy is Cerebral Visual Impairment (CVI), sometimes called cortical visual impairment. CVI is a neurological vision disorder: the eyes themselves may be structurally normal, but the brain has difficulty processing what the eyes see. This is why standard eye tests — the ones that ask your child to read a letter chart — can completely miss CVI. The chart measures the eyes. CVI is in the brain.

Other visual conditions frequently seen in CP include:

- Strabismus (squint) — misalignment of the eyes, present in around 25–40% of children with CP
- Nystagmus — involuntary rhythmic eye movements that affect focus and visual stability
- Refractive errors — short-sightedness, long-sightedness, and astigmatism at higher rates than the general population
- Visual field defects — particularly hemianopia (loss of half the visual field), common in hemiplegic CP
- Ocular motor difficulties — problems tracking moving objects, sustaining visual attention, and shifting gaze between targets

For children at GMFCS IV–V, the rate of significant visual impairment is particularly high, though cerebral palsy vision problems appear across all GMFCS levels and all CP types.

Signs That Vision May Be Affecting Your Child

CVI and other visual processing difficulties don't always look like poor eyesight. They often present as:

- Difficulty recognising familiar faces or objects when seen in a new context or location
- Preferring to look at objects from the corner of the eye rather than directly
- Better performance in visually simple environments — one toy on a plain surface versus a busy toy box
- Reaching past objects or missing them when grabbing
- Appearing to ignore things consistently on one side of the visual field
- Increased difficulty in crowds, busy backgrounds, or visually complex spaces
- Improved recognition of familiar objects in familiar places, but struggling with the same object elsewhere

Many of these behaviours get attributed to cognitive difficulties, attention problems, or non-compliance. A child who appears not to be trying during therapy may genuinely not be processing the visual information being presented to them.

In school-age children, vision difficulties can appear as reluctance to read, avoidance of tasks that require sustained visual attention, difficulty following a moving ball, or what looks like poor spatial awareness. The knock-on effects for learning and participation are significant — and often invisible until someone specifically looks for them.

How Vision Problems Affect Therapy Progress

This is the part that surprises many parents. Visual processing is embedded in motor learning in ways that are easy to underestimate. If a child cannot reliably process where their hand is in space, cannot track a moving target, or consistently misses input on one side of their visual field, physiotherapy and occupational therapy progress slows in ways that are genuinely hard to explain without knowing about the vision component.

Physiotherapists who work with CP often ask children to watch what they are doing — watch your hand, look where you are reaching — without knowing whether the child can actually process that visual feedback. Occupational therapists use visual demonstrations and targets that assume visual processing is intact. When it is not, the therapy approach needs to change, not the child's effort.

A formal CVI assessment — ideally from a specialist in neurological visual impairment rather than a standard ophthalmologist — can open up a different picture. It often leads to changes in how therapy is delivered: using auditory cues instead of visual ones, simplifying the visual environment during exercises, using high-contrast materials, reducing background complexity. These adjustments can meaningfully change what progress looks like.

Getting the assessment is the first step. Knowing what to observe at home in the meantime is the second.

Tracking Vision Changes Between Appointments

Ophthalmology appointments for children with CP are infrequent. The typical gap between specialist visits is six months to a year, sometimes longer. In that time, you are the observer. And unlike a ten-minute clinic appointment, you have hundreds of hours of observation across varied contexts.

What is worth logging:

Visual behaviour patterns. Does your child seem to see better at certain times of day — rested versus fatigued, morning versus afternoon? Does a busy environment reliably produce more difficulty than a calm one? These patterns are often consistent and clinically meaningful.

Eye alignment. Strabismus can fluctuate. Tracking when the squint is more pronounced — during illness, tiredness, sustained near work — gives the ophthalmologist more useful information than a single clinic observation on one particular afternoon.

Falls and spatial awareness. If your child walks, unexpected falls or a pattern of bumping into objects on a consistent side may signal changes in visual field function. The side matters and is worth noting.

Object recognition and search. Observations about when your child found something easily, when they couldn't locate it despite it being visible, and what conditions made the difference build a useful pattern over time.

Behavioural shifts. Increased frustration in visually complex environments, avoidance of previously enjoyed activities, reluctance to go to new or unfamiliar places — these are worth noting even if the connection to vision is not immediately obvious.

None of this requires clinical training. It requires consistent, brief observation — the kind that is easy to forget in the moment but easy to lose across weeks and months.

Cerebral palsy vision problems are common, frequently missed, and genuinely worth investigating if they have not been yet. The parents who navigate this best tend to be the ones who arrive at specialist appointments with specific observations rather than a general sense that something feels off. The Eir app makes it straightforward to build that daily log — care notes, spasticity, sleep, and observations — so that when the ophthalmologist or physio asks what you have noticed, you have an actual record to share rather than relying on memory from the last three months.