title: Choroidal excavation in eye with normal tension glaucoma.
abstract: OBJECTIVE
  To report the case of an eye with normal tension glaucoma and a choroidal excavation.
  
  
  METHODS
  This is an observational case report.
  
  
  RESULTS
  A 59-year-old woman with normal tension glaucoma had a choroidal excavation in the left eye. Her best-corrected visual acuity and intraocular pressure were within normal limits and had been stable for 5 years. Fundus examination showed a small white lesion inferior to the macula and a nerve fiber layer defect at the inferior edge of the optic disc. Humphrey Field Analyzer (HFA) showed visual field defects corresponding to the nerve fiber layer defect with C30-2, and a central scotoma superior to the macula with C10-2. Optical coherence tomography (OCT) showed a 150-µm deep choroidal excavation. Disruptions of the IS/OS line were detected only in the area inferior to the choroidal excavation. During the 5 months of follow-up, her best-corrected visual acuity remained at 1.0 and the IOP ranged from 12 to 14 mm Hg in the left eye. The fundus and OCT images did not deteriorate and the choroidal excavation did not enlarge.
  
  
  CONCLUSIONS
  The disruption of the inner/outer segment (IS/OS) line was detected only at the area surrounding the choroidal excavation. OCT examinations are useful in assessing the area of the residual IS/OS line, and HFA can be used to estimate the residual central visual field.
authors.affiliation: Department of Ophthalmology, Takarazuka Daiichi Hospital, Hyogo, Osaka, Japan ; Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Asao
authors.affiliation: Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Morimoto
authors.affiliation: Department of Ophthalmology, Takarazuka Daiichi Hospital, Hyogo, Osaka, Japan.
authors.forename: Atsuko
authors.initials: A
authors.lastname: Nakada
authors.affiliation: Department of Ophthalmology, Takarazuka Daiichi Hospital, Hyogo, Osaka, Japan.
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Kawasaki
keywords: Choroidal excavation; Humphrey Field Analyzer; Inner/outer segment junction line; Normal tension glaucoma; Optical coherence tomography