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Choroidal excavation in eye with normal tension glaucoma
Kazunobu Asao1, Takeshi Morimoto2, Atsuko Nakada3
1Department of Ophthalmology, Takarazuka Daiichi Hospital, Hyogo, Osaka, Japan ; Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.
Case Reports in Ophthalmology
|July 3, 2014
Summary
This case report details a patient with normal tension glaucoma and a choroidal excavation, finding that optical coherence tomography (OCT) can assess the inner/outer segment (IS/OS) line integrity around the excavation.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Retinal Imaging
Background:
- Normal tension glaucoma (NTG) is characterized by optic nerve damage and visual field loss despite normal intraocular pressure.
- Choroidal excavations are rare findings that can be associated with various ocular pathologies.
Observation:
- A 59-year-old woman with established NTG presented with a choroidal excavation in her left eye.
- Fundus examination revealed a macular lesion and optic disc nerve fiber layer defect. Humphrey Field Analyzer (HFA) demonstrated corresponding visual field defects.
- Optical coherence tomography (OCT) confirmed a 150-µm deep choroidal excavation with disruptions in the inner/outer segment (IS/OS) line inferior to it.
Findings:
- The IS/OS line disruption was localized to the area surrounding the choroidal excavation.
- Visual acuity and intraocular pressure remained stable over a 5-month follow-up period.
- No enlargement of the choroidal excavation or deterioration of OCT/fundus images was observed.
Implications:
- OCT is valuable for evaluating the extent of IS/OS line damage in the presence of choroidal excavations in NTG patients.
- HFA can be utilized to estimate residual central visual field function in such cases.
- This case highlights the importance of advanced imaging in understanding the structural and functional impact of choroidal excavations in glaucoma.
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