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Trait

Absent Bell phenomenon

The Bell phenomenon is the reflex upward movement of the front of the eyeball when the eyelids close (or blink). It protects the eye by helping to keep the cornea moist. This term refers to a lack of this phenomenon, which can be observed with certain conditions such as congenital fibrosis of the extraocular muscles.

HPO HP:6000709

Summary

Also called
Absent palpebral-oculogyric reflex
Body system
Abnormality of the eye

4 condition reports read genes linked to this trait

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6 genes linked to Absent Bell phenomenon

Changes in these genes cause rare conditions in which Absent Bell phenomenon is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.

GeneHow often it is seenConditions
COL25A1collagen type XXV alpha 1 chainVery often (80–99%)In 1 condition
KIF21Akinesin family member 21AVery often (80–99%)In 1 condition
PHOX2Apaired like homeobox 2AVery often (80–99%)In 1 condition
TUBA1Atubulin alpha 1aVery often (80–99%)In 1 condition
TUBB2Btubulin beta 2B class IIbVery often (80–99%)In 1 condition
TUBB3tubulin beta 3 class IIIVery often (80–99%)In 1 condition

How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.

Broader traits

Abnormal involuntary eye movements

Where this comes from

  • The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
  • Data release 2026.10.19-9814e911.

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