title: Migration of rigid gas permeable contact lens into the upper eyelid after trauma: a case report.
abstract: BACKGROUND
  Migration of a rigid gas permeable (RGP) contact lens after trauma is rare, and its clinical characteristics have not been fully discussed.
  
  
  METHODS
  A 36-year-old female showed mild swelling in the right upper eyelid. She lost her RGP contact lens seven months prior to her first visit, from trauma by her child's kick to the right eye. At the first examination, we felt a firm lump inferior to the right brow. Eversion of the upper eyelid also revealed a firm subconjunctival mass superior to the upper tarsus. After incising the conjunctiva, the RGP contact lens was found without a fibrous capsule and granulation tissue in the subconjunctival space. Three years after removal of the lens, the patient did not show any complications, including ptosis.
  
  
  CONCLUSIONS
  The RGP contact lens in the present case migrated into the subconjunctival space superior to the upper tarsus without a fibrous capsule and granulation tissue. These findings are similar to those in previously reported traumatic cases but are different from those in some spontaneous migration cases. This difference may be caused by differences in the migration mechanisms.
authors.affiliation: Department of Oculoplastic, Orbital & Lacrimal Surgery, Aichi Medical University Hospital, 1-1 Yazako-Karimata, Nagakute, Aichi, 480-1195, Japan.|Department of Ophthalmology, University of Seonam College of Medicine, Presbyterian Medical Center, Jeonju, Korea.
authors.forename: Hyera
authors.initials: H
authors.lastname: Kang
authors.affiliation: Department of Oculoplastic, Orbital & Lacrimal Surgery, Aichi Medical University Hospital, 1-1 Yazako-Karimata, Nagakute, Aichi, 480-1195, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Takahashi
authors.affiliation: Department of Oculoplastic, Orbital & Lacrimal Surgery, Aichi Medical University Hospital, 1-1 Yazako-Karimata, Nagakute, Aichi, 480-1195, Japan. cosme@d1.dion.ne.jp.
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Kakizaki
mesh_terms: D000328:Adult; D001763:Blepharoptosis / Q000209:etiology*; D003229:Conjunctival Diseases / Q000209:etiology*; D003261:Contact Lenses; D005131:Eye Injuries / Q000150:complications*; D005260:Female; D005548:Foreign-Body Migration / Q000150:complications*; D006801:Humans
keywords: Granulation tissue; Migration; Rigid gas permeable contact lens; Subconjunctival space; Trauma; fibrous capsule