(en) SJ Hornby, S Adolph, CE Gilbert, L Dandona et A Foster, «Visual acuity in children with coloboma: clinical features and a new phenotypic classification system», Ophthalmology, vol.107, no3, , p.511–20 (PMID10711890, DOI10.1016/S0161-6420(99)00140-2)
(en) SJ Hornby, S Adolph, CE Gilbert, L Dandona et A Foster, «Visual acuity in children with coloboma: clinical features and a new phenotypic classification system», Ophthalmology, vol.107, no3, , p.511–20 (PMID10711890, DOI10.1016/S0161-6420(99)00140-2)