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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Limbal stem cell deficiency
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Accession:HP:0032107 term browser browse the term
Definition:A condition characterized by a loss or deficiency of the stem cells in the limbus that are vital for re-population of the corneal epithelium and to the barrier function of the limbus.
Comment:The corneal epithelium covers the corneal surface and plays a major role in protection and transparency. Epithelial cells are shed regularly and replaced by stem cell sources located at the limbus, a rim of tissue located at the junction of the cornea and sclera. The limbal epithelial stem cells reside in specific regions at the limbus known as the limbal stem cell niches. Damage to the stem cells or disruption of the niches may lead to Limbal Stem Cell Deficiency. In the absence of a healthy corneal epithelium, the conjunctiva proliferates over the cornea resulting in opacification and vascularization, which in turn may lead to reduced vision, pain, and photophobia.

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the eye 0
        Abnormal eye morphology 0
          Abnormal anterior eye segment morphology 0
            Limbal stem cell deficiency 0
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