Abstract

GONZALEZ DE LA ROSA, M. et al. Comparing the ranges of defect measured with standard white on white and Pulsar perimetries. Arch Soc Esp Oftalmol [online]. 2011, vol.86, n.4, pp.113-117. ISSN 0365-6691.

Objectives: Normal thresholds on Pulsar perimetry fall faster than those of standard perimetry in the peripheral visual field. Two related studies were performed. Firstly, the frequency distributions of glaucoma defects on standard automated perimetry (SAP) and the relationship of the centre and periphery (Study A) were studied first, followed by an attempt to establish the limits of pulsar perimetry (Study B). Material and method: A: frequency of defects was calculated in 78.663 SAP perimetries (G1-TOP, Octopus 1-2-3, Haag-Streit). Study B: 204 eyes with mean defect (MD-SAP) lower than 9dB were examined 8.92±4.19 times with SAP (TOP-32, Octopus 311) and temporal modulation perimetry (T30W, Pulsar Perimeter, Haag-Streit). Results: Study A: 50.7% of the SAP examinations showed MD values lower than 9dB and 32.7% bellow 6dB. The MD correlation of the central 20^o with the MD of the most peripheral points was r=0.933. Study B: in cases with MD-TOP-32 lower than 6dB, SAP had the maximum possibility of detecting defect in 0.02% of points and Pulsar in 0.29%. In subjects with MD-TOP-32 between 6 and 9dB frequencies were 0.38% in SAP and 3.5% in Pulsar (5.1% for eccentricities higher than 20^o). Conclusions: Pulsar allows detecting defects, without range limitations, in the initial half of SAP frequencies expected on glaucoma patients. In order to study the progression of deeper defects the examination should focus on the central points, where the dynamic range of both systems is more equivalent.

Keywords : Perimetry; Visual field; Glaucoma; Threshold; Dynamic range.

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