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Correlation between photopic negative response and retinal nerve fiber layer thickness and optic disc topography in glaucomatous eyes.
Invest Ophthalmol Vis Sci. 2008 May; 49(5):2201-7.IO

Abstract

PURPOSE

To investigate whether there is a significant correlation between the photopic negative response (PhNR) of the electroretinogram (ERG) and retinal nerve fiber layer thickness and optic disc topography in glaucomatous eyes.

METHODS

Ninety-nine eyes of 53 patients with open-angle glaucoma (OAG) and 30 eyes of 28 normal volunteers were studied. Photopic ERGs were elicited by red stimuli (644 nm, 1600 cd/m(2)) on a blue background (470 nm, 40 cd/m(2)). The mean deviation (MD) of the visual field was obtained by static visual field analyses. The topography of the optic nerve head was determined by confocal scanning laser ophthalmoscopy. The retinal nerve fiber layer thickness (RNFLT) around the optic nerve head was measured with a scanning laser polarimeter.

RESULTS

The amplitude of the PhNR and the PhNR/b-wave ratio decreased with an increase in visual field defects. The logarithmic values of the PhNR amplitude and PhNR/b-wave amplitude ratio were significantly correlated with the MD better than the linear values. The PhNR amplitude and PhNR/b-wave amplitude ratio were significantly correlated with the RNFLT and the rim area of the optic disc and with the cup/disc area ratio. These correlations were higher when expressed linearly than when stated logarithmically. The sensitivity and specificity were 77% and 90% for the PhNR amplitude and 70% and 87% for the PhNR/b-wave amplitude ratio when the optimal cutoff values were used. Although the a-wave amplitude correlated with the MD, the a-wave amplitudes of most of the patients fell within the normal range. The correlation between the b-wave amplitude and MD was not significant.

CONCLUSIONS

The PhNR amplitudes correlate with the decrease in function and morphology of retinal neurons in eyes with OAG. The linear relationship between the PhNR and the structural parameters indicates that inner retinal function declines proportionately with neural loss in eyes with glaucoma.

Authors+Show Affiliations

Department of Ophthalmology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate, Japan. smachida@iwate-med.ac.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18436853

Citation

Machida, Shigeki, et al. "Correlation Between Photopic Negative Response and Retinal Nerve Fiber Layer Thickness and Optic Disc Topography in Glaucomatous Eyes." Investigative Ophthalmology & Visual Science, vol. 49, no. 5, 2008, pp. 2201-7.
Machida S, Gotoh Y, Toba Y, et al. Correlation between photopic negative response and retinal nerve fiber layer thickness and optic disc topography in glaucomatous eyes. Invest Ophthalmol Vis Sci. 2008;49(5):2201-7.
Machida, S., Gotoh, Y., Toba, Y., Ohtaki, A., Kaneko, M., & Kurosaka, D. (2008). Correlation between photopic negative response and retinal nerve fiber layer thickness and optic disc topography in glaucomatous eyes. Investigative Ophthalmology & Visual Science, 49(5), 2201-7. https://doi.org/10.1167/iovs.07-0887
Machida S, et al. Correlation Between Photopic Negative Response and Retinal Nerve Fiber Layer Thickness and Optic Disc Topography in Glaucomatous Eyes. Invest Ophthalmol Vis Sci. 2008;49(5):2201-7. PubMed PMID: 18436853.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Correlation between photopic negative response and retinal nerve fiber layer thickness and optic disc topography in glaucomatous eyes. AU - Machida,Shigeki, AU - Gotoh,Yasutaka, AU - Toba,Yoshiharu, AU - Ohtaki,Aki, AU - Kaneko,Muneyoshi, AU - Kurosaka,Daijiro, PY - 2008/4/26/pubmed PY - 2008/6/10/medline PY - 2008/4/26/entrez SP - 2201 EP - 7 JF - Investigative ophthalmology & visual science JO - Invest Ophthalmol Vis Sci VL - 49 IS - 5 N2 - PURPOSE: To investigate whether there is a significant correlation between the photopic negative response (PhNR) of the electroretinogram (ERG) and retinal nerve fiber layer thickness and optic disc topography in glaucomatous eyes. METHODS: Ninety-nine eyes of 53 patients with open-angle glaucoma (OAG) and 30 eyes of 28 normal volunteers were studied. Photopic ERGs were elicited by red stimuli (644 nm, 1600 cd/m(2)) on a blue background (470 nm, 40 cd/m(2)). The mean deviation (MD) of the visual field was obtained by static visual field analyses. The topography of the optic nerve head was determined by confocal scanning laser ophthalmoscopy. The retinal nerve fiber layer thickness (RNFLT) around the optic nerve head was measured with a scanning laser polarimeter. RESULTS: The amplitude of the PhNR and the PhNR/b-wave ratio decreased with an increase in visual field defects. The logarithmic values of the PhNR amplitude and PhNR/b-wave amplitude ratio were significantly correlated with the MD better than the linear values. The PhNR amplitude and PhNR/b-wave amplitude ratio were significantly correlated with the RNFLT and the rim area of the optic disc and with the cup/disc area ratio. These correlations were higher when expressed linearly than when stated logarithmically. The sensitivity and specificity were 77% and 90% for the PhNR amplitude and 70% and 87% for the PhNR/b-wave amplitude ratio when the optimal cutoff values were used. Although the a-wave amplitude correlated with the MD, the a-wave amplitudes of most of the patients fell within the normal range. The correlation between the b-wave amplitude and MD was not significant. CONCLUSIONS: The PhNR amplitudes correlate with the decrease in function and morphology of retinal neurons in eyes with OAG. The linear relationship between the PhNR and the structural parameters indicates that inner retinal function declines proportionately with neural loss in eyes with glaucoma. SN - 0146-0404 UR - https://www.unboundmedicine.com/medline/citation/18436853/Correlation_between_photopic_negative_response_and_retinal_nerve_fiber_layer_thickness_and_optic_disc_topography_in_glaucomatous_eyes_ L2 - https://iovs.arvojournals.org/article.aspx?doi=10.1167/iovs.07-0887 DB - PRIME DP - Unbound Medicine ER -