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Published in: Graefe's Archive for Clinical and Experimental Ophthalmology 6/2019

01-06-2019 | Night-Blindness | Retinal Disorders

Disinhibition of intrinsic photosensitive retinal ganglion cells in patients with X-linked congenital stationary night blindness

Authors: Andreas Schatz, Carina Kelbsch, Christina Zeitz, Susanne Kohl, Eberhart Zrenner, Florian Gekeler, Helmut Wilhelm, Barbara Wilhelm, Gabriel Willmann

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 6/2019

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Abstract

Purpose

To assess the pupil light response (PLR) to chromatic stimulation in patients with different types of X-linked congenital stationary night blindness (CSNB).

Methods

Eight patients with CSNB due to CACNA1F and NYX mutations were exposed to blue and red light stimuli, and PLR was evaluated using infrared video pupillography. Pupil responses were compared between CSNB patients and healthy subjects (n = 34) at baseline, at maximum of constriction, for post-illumination pupil responses (PIPR) and the slope of redilation using Cohen’s d. A subgroup comparison was performed descriptively between CACNA1F and NYX associated CSNB patients using the same parameters.

Results

In CSNB, smaller baseline pupil diameters compared to healthy subjects were measured both before blue and red light stimulation (d = 1.44–1.625). The maximum constriction to blue light stimuli was smaller for the CSNB group compared to healthy subjects (d = 1.251) but not for red light stimuli (d = 0.449). Pupil response latencies were prolonged in CSNB for both light stimuli (d = −1.53 for blue and d = −1.011 for red stimulation). No relevant differences were found between the CSNB group and healthy subjects for PIPR (d = 0.01), but the slope of redilation was smaller for CSNB patients (d = 2.12). Paradoxical pupil constriction at light offset was not seen in our patients.

Conclusion

A reduced redilation and smaller baseline pupil diameters for patients with CSNB indicate a disinhibition of intrinsically photosensitive retinal ganglion cells due to affected post-photoreceptor transduction via bipolar cells and can explain the pupillary behavior in our patient group.
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Metadata
Title
Disinhibition of intrinsic photosensitive retinal ganglion cells in patients with X-linked congenital stationary night blindness
Authors
Andreas Schatz
Carina Kelbsch
Christina Zeitz
Susanne Kohl
Eberhart Zrenner
Florian Gekeler
Helmut Wilhelm
Barbara Wilhelm
Gabriel Willmann
Publication date
01-06-2019
Publisher
Springer Berlin Heidelberg
Keyword
Night-Blindness
Published in
Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 6/2019
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-019-04319-w

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