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Communication, hearing and vision in Hurler syndrome (MPS I-H)

Hurler syndrome (severe MPS I, MPS I-H) can affect how a child hears, sees and communicates. Glue ear, progressive hearing loss, corneal clouding and neurological involvement can all influence speech, language and learning, even when haematopoietic stem cell transplantation (HSCT) and enzyme replacement therapy (ERT) are used early.

This page explains the main hearing and vision issues seen in Hurler syndrome, how they relate to communication, and what families, schools and clinicians can do to support children, teenagers and adults in everyday life.

Small changes and the right technology can make communication much easier.

The impact of MPS I on ears and eyes

In Hurler syndrome, glycosaminoglycans (GAGs) build up in many tissues, including:

Ear structures

  • Thickening of tissues around the Eustachian tube, middle ear and ossicles
  • Increased risk of glue ear (otitis media with effusion) and recurrent infections
  • Progressive sensorineural hearing loss in some patients

Eye structures

  • Corneal clouding from GAG storage in the cornea
  • Possible retinal changes and optic nerve involvement
  • Light sensitivity and reduced contrast sensitivity in some cases

These changes can occur even in transplanted patients and often progress over time, so regular hearing and vision checks are essential.

Body systems in Hurler syndrome

Hearing in Hurler syndrome

Children and adults with Hurler syndrome may have:

  • Conductive hearing loss
    • Often due to glue ear and middle ear effusions
    • May fluctuate and can sometimes improve with grommets (ventilation tubes)
  • Sensorineural hearing loss
    • Due to changes in the inner ear or auditory nerve
    • Usually permanent and may worsen with age
  • Mixed hearing loss
    • Combination of both conductive and sensorineural components

Signs to look for:

  • Turning up the TV or devices very loud
  • Not responding when called, especially in noisy environments
  • Delayed or unclear speech
  • Difficulty following instructions at school or nursery
  • Behaviour often described as "not listening" or "daydreaming"

Early referral to audiology and ENT services is vital for diagnosis and management.

Treatments, technology and classroom strategies

Management usually involves a combination of medical and practical measures:

  • Medical and ENT interventions
    • Grommets for persistent glue ear (if appropriate)
    • Treatment of recurrent infections
    • Consideration of adenoidectomy and other ENT procedures on a case-by-case basis
  • Hearing technology
    • Hearing aids (air conduction or bone conduction depending on the pattern of loss)
    • FM or radio aids and classroom soundfield systems to improve hearing of the teacher
    • In selected cases, consideration of more advanced devices as guided by audiology
  • Everyday strategies
    • Speak clearly, facing the person
    • Reduce background noise where possible
    • Check understanding rather than only asking "Do you understand?"
    • Encourage the child or adult to say when they have not heard something

Education and school

Vision in Hurler syndrome

People with Hurler syndrome may experience:

  • Corneal clouding
    • Blurred or hazy vision
    • Glare and light sensitivity
    • Difficulty seeing details, especially in low contrast environments
  • Refractive errors
    • Long- or short-sightedness and astigmatism, often requiring glasses
  • Other potential changes
    • Retinal involvement and optic nerve issues in some patients
    • Reduced contrast sensitivity or visual field changes

Practical signs include:

  • Squinting or holding books very close
  • Difficulty seeing the board at school
  • Bumping into objects or struggling in dim light
  • Complaints of headaches or tired eyes

Regular review by an ophthalmologist familiar with MPS conditions is recommended.

Making it easier to see and navigate

Helpful approaches include:

  • Corrective lenses
    • Glasses or contact lenses (where appropriate and tolerated)
    • Tinted lenses or filters to reduce glare
  • Environmental changes
    • Good, even lighting; avoid harsh glare
    • High contrast between text and background
    • Bold, large print materials and clear fonts
    • Clear visual pathways at home and school (avoid clutter, mark steps and thresholds)
  • Access to information
    • Seating closer to the board or speaker
    • Use of large screens, tablets or magnification tools
    • Adjusting digital settings (zoom, high-contrast modes, screen readers if needed)

These adaptations help not only with academic work but also with safety and independence in daily life.

How hearing, vision and brain involvement interact

Communication in Hurler syndrome can be influenced by:

  • Hearing loss: making it harder to pick up speech sounds and language patterns
  • Vision issues: affecting access to facial expressions, lip-reading and visual cues
  • Neurocognitive involvement: in some children, especially if HSCT is delayed or incomplete in its CNS protection
  • Frequent hospital stays: disrupting early social interaction and exposure to language

Some children may have:

  • Delays in first words or sentences
  • Difficulty pronouncing certain sounds
  • Challenges understanding complex language or following multi-step instructions
  • Expressive language that is behind their understanding

Early referral to speech and language therapy (SLT) is important to assess strengths and needs and plan interventions.

Building communication in many ways

Speech and language therapy

  • Assesses speech, language understanding, social communication and swallowing where relevant
  • Provides targeted therapy to support vocabulary, grammar, speech clarity and conversation skills

Visual supports and signing

  • Visual schedules, symbols, gestures and sign-supported speech
  • Supports understanding and reduces frustration

Communication aids and technology

  • Tablets or devices with communication apps where helpful
  • Technology can support independence and choice-making

Using alternative or augmentative communication does not stop speech developing; it usually supports it. The goal is to ensure the child or adult can express choices, feelings and needs in whichever way works best.

Small changes that have a big impact

At home

  • Get the person's attention before speaking (say their name, touch their arm gently if appropriate).
  • Speak clearly and at a moderate pace. Avoid shouting, which can distort sound.
  • Use short sentences, then build up to more complex explanations.
  • Combine words with gestures, pictures or objects to support understanding.
  • Give extra time for responses. Silence does not always mean the message wasn't understood.

At school or work

  • Always face the student or colleague when speaking.
  • Check comprehension with open questions ("What do you need to do next?") rather than yes or no questions.
  • Provide written or visual instructions in addition to spoken ones.
  • Allow extra processing time and avoid rapid-fire instructions.
  • Be alert to signs that the person is missing information (copies from peers, looks lost, acts out).

Hearing, vision and feeling included

Hearing and vision difficulties can affect:

  • Confidence: being afraid to ask for clarification, or feeling embarrassed
  • Friendships: missing jokes or parts of conversations
  • Behaviour: frustration that may look like "naughtiness" or withdrawal
  • Mental health: anxiety about not keeping up, or low mood from feeling different

Supportive strategies:

  • Encourage peers to speak clearly and include the child or adult in games and conversations.
  • Praise the person for asking for repetition or help. This is a strength, not a weakness.
  • Provide access to school counselling, psychology or pastoral support where needed.
  • Link families to hearing and vision support services and relevant charities or peer groups.

Emotional wellbeing matters just as much as access to sound and print. Mental health and emotional wellbeing

For families and adults

Getting the right assessments and support

You might wish to ask:

  • How often should my child's hearing and vision be checked?
  • Has my child been referred to audiology, ENT, ophthalmology and speech and language therapy?
  • Would hearing aids, glasses or classroom technology help at this stage?
  • Are there specialist hearing or vision support teachers who can visit school?
  • What can we do at home to help communication and language development?

Keeping copies of audiology and eye clinic reports can help with school planning and future appointments.

For healthcare and education professionals

Integrating sensory and communication care

  • Recognise that hearing and vision impairment are common and often under-recognised in Hurler syndrome.
  • Build regular audiology and ophthalmology review into long-term follow-up.
  • Refer early to speech and language therapy, even if speech problems seem mild.
  • Communicate clearly with schools and workplaces so that necessary adaptations are understood and implemented.
  • Treat communication support as an essential part of multidisciplinary care, not an optional extra.

Multidisciplinary care

Key points about communication, hearing and vision

  • Hurler syndrome commonly affects hearing and vision, even after HSCT and ERT.
  • Hearing loss (conductive, sensorineural or mixed) and corneal clouding can significantly influence communication, learning and social life.
  • Regular audiology, ENT, ophthalmology and speech and language input are essential parts of care.
  • Simple changes at home, school and work, including clear speech, good lighting, seating, visual supports and technology, can hugely improve access to information and inclusion.
  • Communication support, including alternative communication where needed, helps children, teenagers and adults express themselves and participate fully.

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