Primitive Reflexes and Vision: The Connection

Parents usually hear about primitive reflexes from an occupational therapist, a teacher or a podcast, and they arrive with a fair question: what could a baby reflex possibly have to do with how my child’s eyes work?

The honest answer has two halves. The clinical reasoning is coherent and worth understanding. The research behind it is small and mostly uncontrolled. Here are both.

Key takeaways

• Primitive reflexes are automatic brain-stem movement patterns that normally integrate during the first year of life (Chamarthi et al., 2026).
• Because they are triggered by head and neck position, a lingering reflex shows up in the postures a child uses to read and write — and posture is the platform the eyes work from.
• The most direct evidence is a single 2024 study of 193 patients aged 4 to 16, in which group averages for eye movements improved after reflex-inhibition therapy — but it had no control group and the author notes that normal growth could account for some of it (Domingo-Sanz, 2024).
• Residual reflex activity is common in typically developing children, so a positive finding is a place to look, not a diagnosis (Gieysztor et al., 2018).
• We treat the measured vision findings. Reflex and posture work is supporting work, and it often belongs with an occupational therapist.

What a primitive reflex is

Primitive reflexes are automatic movement patterns generated in the brain stem. They help a baby through birth and the first months of life and build the muscle tone, head control and sensory experience that voluntary movement is later built on. Child neurologists have used them for decades as a simple check on whether an infant’s nervous system is on schedule, because delayed disappearance is a classic finding in cerebral palsy (Zafeiriou, 2004).

Most fade quickly: the asymmetric tonic neck reflex at about 3 to 4 months, the Moro, Galant, rooting and palmar grasp reflexes at roughly 4 to 6 months (Chamarthi et al., 2026). Clear persistence past that window belongs with your pediatrician. What we see is subtler: a faint remnant of a pattern in an otherwise healthy child. Learning to Learn Part 2 walks through each reflex and its timeline.

Why a movement pattern would touch the eyes

What follows is clinical reasoning — how developmental optometrists and occupational therapists think about these patterns — not established mechanism. The movement patterns themselves are described the same way across the developmental literature; the lines we draw from them to reading and desk work are our clinical read. Take them as things worth checking, not as proven cause and effect.

The common thread is the head. The three reflexes we watch most closely are all triggered by where the head sits in space, and reading, writing and copying from the board require a still head while the eyes do the moving.

ATNR and the reach across the midline

Turning the head extends the arm and leg on the face side and bends the opposite pair — the fencer’s pose (Chamarthi et al., 2026). A head turn therefore nudges the whole body, and the child learns to avoid turning across the midline — the same midline the eyes cross on every line of text. The ATNR is one of the three reflexes reported most often in this research, alongside the STNR and TLR (Provaznik et al., 2026), and it is the one we most often see alongside rotated paper, a tilted head and losing the place.

STNR and the desk posture

Looking down bends the arms and straightens the legs; looking up reverses it. Near work asks a child to drop the head to the page and hold a quiet arm at the same moment the pattern pulls that arm the other way. What we see is the propped head, the foot hooked around the chair leg, slow copying, and a working distance that keeps drifting too close.

TLR and knowing where upright is

Head back extends the body; head forward folds it. This one feeds the vestibular system, which supplies the sense of upright the eyes reference for stable, level vision, so it surfaces when balance, posture and moving from board to page are all effortful. If clumsiness is your leading concern, start with vision problems masquerading as poor coordination or our motor and coordination symptoms page.

What the research does and does not show

We use this framework in the clinic, and families deserve to know how thin the evidence under it is.

The most direct evidence is a single 2024 study that measured eye movements in 193 patients aged 4 to 16 before and after therapy to inhibit the ATNR, STNR, TLR and Moro reflexes. On average, fixations and mean saccade size fell, ocular motility rose, and balance between the two eyes improved (Domingo-Sanz, 2024). Mean fixation duration shortened too, but that was the weakest of the results and counted as significant only under a one-sided test at a relaxed threshold. The study is retrospective with no control group, and the author notes they were about a year older by the end — ordinary maturation could explain part of it.

The wider literature is no stronger:

• A double-blind randomized trial of 60 children with reading difficulties found a reflex-replication movement program reduced ATNR while placebo movement and no movement did not (McPhillips et al., 2000). One small trial, and the outcome it quantified was the reflex.
• Among 409 nine- and ten-year-olds the weakest readers had more persistent ATNR, and the same authors concluded that reflex persistence “cannot be used as a causal model for reading difficulties, including dyslexia” (McPhillips & Sheehy, 2004).
• Sixty-five percent of 35 healthy preschoolers showed residual reflex activity (Gieysztor et al., 2018), which is exactly why a positive finding on its own means little.
• Four small studies pooling 229 children found moderate correlations between ADHD symptoms and retained ATNR and STNR (Wang et al., 2023) — correlations, with no treatment evidence attached.
• A 2026 systematic review found studies linking persisting reflexes to motor and academic difficulties and called the intervention studies “promising” rather than proven (Provaznik et al., 2026).

Professional bodies disagree about the surrounding territory too. The 2009 joint statement from the American Academy of Pediatrics, the American Academy of Ophthalmology and allied groups holds that dyslexia is language-based and that evidence does not support eye exercises or behavioral vision therapy for learning disabilities (AAP/AAO/AAPOS/AACO, 2009). The optometric position is that vision problems can and often do interfere with learning, and that optometric care is one part of multidisciplinary management (AAO/AOA, 1997). We work inside the second position, offered as our clinical perspective rather than as settled science.

How we screen, and where occupational therapy comes in

A reflex observation is never by itself a reason to start treatment. During a developmental vision evaluation we measure eye teaming, focusing and tracking, then watch how the body supports that work: head position at near, midline crossing, posture, balance and the specific reflex positions. An acuity check alone surfaces none of it — the AOA’s pediatric guideline reports that Snellen acuity by itself missed 75.5% of children later found to have binocular and oculomotor problems on a complete examination (AOA, 2017).

When posture and reflex patterns are the dominant finding, the right professional is often an occupational or physical therapist, and we refer. When the visual findings dominate, we treat those — and there the evidence is genuinely better. Office-based vergence and accommodative therapy produced a successful or improved outcome in 73% of children with symptomatic convergence insufficiency versus 35% on placebo (CITT, 2008), though the same therapy did not beat placebo for reading comprehension (CITT-ART, 2019) — a limit we state plainly to every family.

Our primitive reflexes page shows how this fits a broader program, and What Can My Baby See? covers the infant visual development it grows out of.

What we will not claim

We will not tell you that a retained reflex caused your child’s vision problem, that integrating it will raise a reading score, or that reflex work treats dyslexia or ADHD. What we will say is that when a child’s posture, head position and eye movements all look like hard work, that is worth measuring properly.

If that sounds like your child, a developmental vision evaluation is the sensible next step, or Schedule an evaluation at one of our four South Florida offices.