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Decibel scale humphrey visual filed4/12/2024 FST is as an alternative to VF or ERG for assessment of retinal function in patients unable to do visual fields or with non-detectable ERGs. Visual field testing involves assessment of contrast threshold at multiple points in the field. The normal visual field extends 90° temporally, 70° inferiorly, and 60° nasally and superiorly. FST results showed stronger correlations with full-field ERG amplitude than with sensitivity measured with visual field tests. The visual field is the portion of space visible to a single stationary eye. Nevertheless, considering only the eyes with recordable ERG responses, moderate correlations were found between combined dark-adapted a-wave amplitude (r = -0.560 P < 0.01), b-wave amplitude (r = -0.643 P < 0.001), 30-Hz flicker response (r = -0.501 P < 0.01), and FST, and high correlation with FST for cone b-wave amplitude (r = -0.715 P < 0.01).įST could be successfully determined in RP patients with a wide range of vision loss. Dark and light-adapted ERGs were detectable in 28 and 48 eyes, respectively. In contrast, statistically significant correlations were found between FST and static 30-2 VF mean deviation (r = -0.389 P < 0.01), microperimetry mean threshold (r = -0.607 P < 0.01). No significant correlation was found between BCVA and FST. 14 These advantages over other, more conventional, analyses of visual progression are. Results were compared with 1 conventional SAP examination (Humphrey Visual Field HVF. Full-field ERG (ISCEV standard) was recorded, and achromatic FST was measured using a Diagnosys Espion system with the ColorDome™ LED full-field stimulator (Diagnosys LLC, Lowell, MA, USA).īCVA mean ± SD was 0.31 ± 0.03 logMAR, and FST mean ± SD was -18.45 ± 9.53 dB. Because the P value of PoPLR is based on each individual patient's visual field series, it implicitly corrects for patients with higher or lower variability than average, and it also is entirely independent of the underlying measurement (decibel) scales. The Humphrey uses fixed points of light which are shown at different intensity levels. It’s an automated, static perimeter (unlike Goldmann kinetic perimetry which requires a human operator, and uses a moving target). Patients were submitted to comprehensive ophthalmological examination including measurement of best-corrected visual acuity (BCVA), 30-2 threshold static VF, and microperimetry. Here, we’ll only talk about the Humphrey visual field perimeter, which is used for 99 of visual field tests. The purpose of this study is to describe the relationships between full-field stimulus threshold (FST), electroretinography (ERG), and visual field (VF) outcomes in retinitis pigmentosa (RP).ĭata from 47 patients with RP (n = 94 eyes) were evaluated.
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