Visual‐Evoked Response, Pattern Electroretinogram, and Psychophysical Magnocellular Thresholds in Glaucoma, Optic Atrophy, and Dyslexia

Abstract

Contrast thresholds to magnocellular-specific stimuli are consistent in cortex and retina. VEPs are more reliable. Psychophysics seems to tap different mechanisms. VEPs are very sensitive to early glaucoma. The lack of VEP loss in dyslexia suggests the other losses are artifactual. Further research is needed to see if stimuli even more like the frequency-doubling technology are more useful clinically.

Diagnostic Value of Color Doppler Imaging and Pattern Visual Evoked Potential in Primary Open-Angle Glaucoma

“…Parisi et al [16] found that the latency of P100 delayed and amplitude of P100 decreased in primary open angle glaucoma (POAG) patients comparing with that of normal subjects. The present study found that the latency of P100 delayed and amplitude of P100 decreased in POAG patients comparing with that of control subjects, which was consistent with previous investigations [16][17][18][19][20][21]. Furthermore, we also found the MD values in the POAG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [18].…”

Diagnostic Value of Color Doppler Imaging and Pattern Visual Evoked Potential in Primary Open-Angle Glaucoma

“…Parisi et al [16] found that the latency of P100 delayed and amplitude of P100 decreased in primary open angle glaucoma (POAG) patients comparing with that of normal subjects. The present study found that the latency of P100 delayed and amplitude of P100 decreased in POAG patients comparing with that of control subjects, which was consistent with previous investigations [16][17][18][19][20][21]. Furthermore, we also found the MD values in the POAG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [18].…”

Color Doppler imaging and pattern visual evoked potential in normal tension glaucoma and hypertension glaucoma

“…Parisi et al [23] found that the latency Other researches also showed that the latency of P100 delayed in POAG patients comparing with that of ocular hypertension patients and normal subjects [24][25][26]. The present study found that the latency of P100 delayed and amplitude of P100 decreased in NTG and HTG patients comparing with that of control subjects, which was consistent with previous investigations [23][24][25][26][27][28][29][30]. Furthermore, we also found the MD values in the NTG and HTG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [25,27,31].…”

Defective chromatic and achromatic visual pathways in developmental dyslexia: Cues for an integrated intervention programme

“…Our results concerning poor perceptual sensitivity of dyslexic children towards achromatic stimuli with low spatial frequency and low luminance contrast confirm those obtained by others (May et al., 1991; Maddock et al., 1992; Romani et al., 2001; Samar et al., 2002; Vaegan & Hollows, 2006) supporting the hypothesis of a magnocellular-dorsal weakness as an integral part of the neurobiological substrate of developmental dyslexia. This is a hypothesis that still maintains its objective value, even though it has been reformulated with respect to the original magnocellular theory and is now known as “sluggish attentional shifting (SAS) hypothesis” (Hari & Renvall, 2001).…”

Diagnostic Value of Color Doppler Imaging and Pattern Visual Evoked Potential in Primary Open-Angle Glaucoma

“…Parisi et al [16] found that the latency of P100 delayed and amplitude of P100 decreased in primary open angle glaucoma (POAG) patients comparing with that of normal subjects. The present study found that the latency of P100 delayed and amplitude of P100 decreased in POAG patients comparing with that of control subjects, which was consistent with previous investigations [16][17][18][19][20][21]. Furthermore, we also found the MD values in the POAG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [18].…”

Color Doppler imaging and pattern visual evoked potential in normal tension glaucoma and hypertension glaucoma

“…Parisi et al [23] found that the latency Other researches also showed that the latency of P100 delayed in POAG patients comparing with that of ocular hypertension patients and normal subjects [24][25][26]. The present study found that the latency of P100 delayed and amplitude of P100 decreased in NTG and HTG patients comparing with that of control subjects, which was consistent with previous investigations [23][24][25][26][27][28][29][30]. Furthermore, we also found the MD values in the NTG and HTG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [25,27,31].…”

Defective chromatic and achromatic visual pathways in developmental dyslexia: Cues for an integrated intervention programme

“…Our results concerning poor perceptual sensitivity of dyslexic children towards achromatic stimuli with low spatial frequency and low luminance contrast confirm those obtained by others (May et al., 1991; Maddock et al., 1992; Romani et al., 2001; Samar et al., 2002; Vaegan & Hollows, 2006) supporting the hypothesis of a magnocellular-dorsal weakness as an integral part of the neurobiological substrate of developmental dyslexia. This is a hypothesis that still maintains its objective value, even though it has been reformulated with respect to the original magnocellular theory and is now known as “sluggish attentional shifting (SAS) hypothesis” (Hari & Renvall, 2001).…”

Diagnostic Value of Color Doppler Imaging and Pattern Visual Evoked Potential in Primary Open-Angle Glaucoma

“…Parisi et al [16] found that the latency of P100 delayed and amplitude of P100 decreased in primary open angle glaucoma (POAG) patients comparing with that of normal subjects. The present study found that the latency of P100 delayed and amplitude of P100 decreased in POAG patients comparing with that of control subjects, which was consistent with previous investigations [16][17][18][19][20][21]. Furthermore, we also found the MD values in the POAG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [18].…”

Color Doppler imaging and pattern visual evoked potential in normal tension glaucoma and hypertension glaucoma

“…Parisi et al [23] found that the latency Other researches also showed that the latency of P100 delayed in POAG patients comparing with that of ocular hypertension patients and normal subjects [24][25][26]. The present study found that the latency of P100 delayed and amplitude of P100 decreased in NTG and HTG patients comparing with that of control subjects, which was consistent with previous investigations [23][24][25][26][27][28][29][30]. Furthermore, we also found the MD values in the NTG and HTG patients were negatively correlated with the latency time of P100, which was agreed with the previous studies [25,27,31].…”

Defective chromatic and achromatic visual pathways in developmental dyslexia: Cues for an integrated intervention programme

“…Our results concerning poor perceptual sensitivity of dyslexic children towards achromatic stimuli with low spatial frequency and low luminance contrast confirm those obtained by others (May et al., 1991; Maddock et al., 1992; Romani et al., 2001; Samar et al., 2002; Vaegan & Hollows, 2006) supporting the hypothesis of a magnocellular-dorsal weakness as an integral part of the neurobiological substrate of developmental dyslexia. This is a hypothesis that still maintains its objective value, even though it has been reformulated with respect to the original magnocellular theory and is now known as “sluggish attentional shifting (SAS) hypothesis” (Hari & Renvall, 2001).…”