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H. G. Lemij, J. G. van der Schoot, N. J. Reus, T. P. Colen; Short Wavelength Automated Perimetry Is a Poor Predictor of Conversion to Glaucoma. Invest. Ophthalmol. Vis. Sci. 2008;49(13):1107.
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© ARVO (1962-2015); The Authors (2016-present)
Short wavelength automated perimetry (SWAP) has been claimed1 to predict conversion to glaucoma 3-4 years before standard automated perimetry (SAP) defects occur. Our purpose was to compare the moment of glaucomatous conversion between SWAP and SAP.
A Humphrey Field Analyser (24-2 program) was used to perform both SWAP and SAP. 450 subjects with intraocular hypertension (IOP ≥22 and ≤32 mmHg and normal visual fields) were tested once every half year during seven to ten years or until the onset of conversion (study endpoint). The conversion to glaucoma was defined as a reproducible glaucomatous visual field defect on SAP. The moment of onset of this defect on SAP was compared to that on SWAP.
Of the 450 initial participants, 23 showed conversion on SAP. Of these, 20 did not show earlier conversion on SWAP than on SAP. In only 3 eyes did SWAP show earlier conversion by up to 18 months. SAP showed earlier conversion than SWAP in 4 cases.
Our results do not support the notion that SWAP generally predicts conversion to glaucoma on SAP. Instead, SAP appears to be at least as sensitive to conversion as SWAP in a large majority of eyes.Keywords: Conversion, glaucoma, ocular hypertension, SWAP, SAPReferences: 1. Johnson CA, Adams AJ, Casson EJ, Brandt JD. Blue-on-yellow perimetry can predict the development of glaucomatous visual field loss. Arch Ophtalmol. 1993;111:645-50
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