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Glaucoma: Overview01:25

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Related Experiment Video

Updated: Mar 23, 2026

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Intraocular pressure elevation and choroidal thinning.

Ya Xing Wang1, Ran Jiang1, Xiao Lei Ren1

  • 1Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University; Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing, China.

The British Journal of Ophthalmology
|March 27, 2016
PubMed
Summary

Acute intraocular pressure (IOP) elevation significantly decreases subfoveal and peripapillary choroidal thickness. These findings highlight the dynamic relationship between IOP and choroidal measurements, emphasizing the need to consider current IOP when assessing choroidal thickness.

Keywords:
ChoroidGlaucomaImagingIntraocular pressure

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Area of Science:

  • Ophthalmology
  • Optometry
  • Medical Imaging

Background:

  • Intraocular pressure (IOP) is a critical factor in ocular health, influencing conditions like glaucoma.
  • Choroidal thickness, particularly subfoveal choroidal thickness (SFCT) and peripapillary choroidal thickness (PPCT), is a key parameter in assessing ocular health and disease progression.
  • The impact of acute IOP fluctuations on choroidal thickness requires further investigation.

Purpose of the Study:

  • To investigate the effect of acute intraocular pressure (IOP) elevation, induced by a dark room prone provocative test (DRPPT), on subfoveal choroidal thickness (SFCT) and peripapillary choroidal thickness (PPCT).

Main Methods:

  • A prospective cohort study involving 114 eyes from 65 individuals with an IOP elevation of at least 2 mm Hg during the DRPPT.
  • Participants underwent a 2-hour dark room provocative test with their forehead on a desk.
  • Tonometry and enhanced depth imaging spectral-domain optical coherence tomography were performed at baseline and post-test to measure IOP and choroidal thickness.

Main Results:

  • The DRPPT provoked a significant IOP increase (10.1±10.9 mm Hg).
  • Both SFCT and PPCT showed significant decreases (p<0.001) post-test.
  • Multivariate analysis revealed that greater SFCT thinning correlated with higher IOP increase and shallower baseline anterior chamber depth; greater PPCT change correlated with higher IOP increase and thicker baseline choroidal thickness.

Conclusions:

  • Acute IOP elevation induced by the DRPPT leads to a parallel decrease in both subfoveal and peripapillary choroidal thickness.
  • These results indicate that choroidal thickness is dependent on current IOP levels.
  • Clinicians should consider the influence of IOP when measuring choroidal thickness.