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Abstract #67211 Published in IGR 17-4
Intraocular pressure elevation and choroidal thinning
Wang YX; Jiang R; Ren XL; Chen JD; Shi HL; Xu L; Wei WB; Jonas JBBritish Journal of Ophthalmology 2016; 100: 1676-1681
PURPOSE: To evaluate changes in subfoveal choroidal thickness (SFCT) and peripapillary choroidal thickness (PPCT) after acute intraocular pressure (IOP) elevation provoked by a dark room prone provocative test (DRPPT). METHODS: The prospective cohort study included 114 eyes from 65 individuals who had an IOP elevation ≥2 mm Hg during the DRPPT. The participants stayed in a dark room for 2 h with the forehead placed on a desk. At baseline and within 5 min after the end of the DRPPT, tonometry and enhanced depth imaging by spectral-domain optical coherence tomography were carried out. RESULTS: During the DRPPT, IOP increased by 10.1±10.9 mm Hg, SFCT decreased significantly (p<0.001) from 280±80 µm to 267±76 µm and PPCT decreased significantly (p<0.001) from 177±74 to 169±70 µm. In multivariate analysis, a more marked SFCT thinning was associated with higher IOP increase (p<0.001) and shallower anterior chamber depth at baseline (p=0.01). In a similar manner, a higher PPCT change was correlated with a higher IOP increase (p<0.001), and a thicker choroidal thickness at baseline (p<0.001). CONCLUSIONS: Choroidal thickness in the subfoveal region and in the peripapillary region decreased parallel to an acute increase in IOP in individuals 2 h after a dark room test. Choroidal thickness depends on the actual IOP, which may be noted when choroidal thickness is measured.
Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University; Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing, China.
Full articleClassification:
6.13 Provocative tests (Part of: 6 Clinical examination methods)
2.12 Choroid, peripapillary choroid, peripapillary atrophy (Part of: 2 Anatomical structures in glaucoma)
6.1.3 Factors affecting IOP (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
