Intrinsically photosensitive (melanopsin) retinal ganglion cell function in glaucoma

Feigl, Beatrix, Mattes, Dietmar, Thomas, Ravi and Zele, Andrew J. (2011) Intrinsically photosensitive (melanopsin) retinal ganglion cell function in glaucoma. Investigative Ophthalmology & Visual Science, 52 7: 4362-4367. doi:10.1167/iovs.10-7069


Author Feigl, Beatrix
Mattes, Dietmar
Thomas, Ravi
Zele, Andrew J.
Title Intrinsically photosensitive (melanopsin) retinal ganglion cell function in glaucoma
Journal name Investigative Ophthalmology & Visual Science   Check publisher's open access policy
ISSN 0146-0404
1552-5783
Publication date 2011-06
Sub-type Article (original research)
DOI 10.1167/iovs.10-7069
Volume 52
Issue 7
Start page 4362
End page 4367
Total pages 6
Place of publication Rockville, MD, United States
Publisher Association for Research in Vision and Ophthalmology
Collection year 2012
Language eng
Formatted abstract
Purpose
To determine whether glaucoma alters intrinsically photosensitive retinal ganglion cell (ipRGC) function.

Methods
Forty-one patients (25 with glaucoma and 16 healthy age-matched control participants) were tested. Intrinsically photosensitive retinal ganglion cell function was directly measured by the sustained, postillumination pupil response (PIPR). Forty-one eyes of 41 participants were tested with 7°, 10-second, short-wavelength (488 nm; bluish) and long-wavelength (610 nm; reddish) stimuli (14.2 log photons · cm−2 · s−1) presented to the right eye in Maxwellian view, and the consensual pupil response of the left eye was measured by infrared pupillometry. The difference between PIPR amplitude (percentage baseline pupil diameter), net PIPR (percentage change) and kinetics (time in mm · s−1 to the PIPR plateau) for the blue and red stimuli in patients with early and advanced (moderate/severe) glaucoma was compared to that in age-matched control participants.

Results
The blue PIPR was significantly smaller between normal participants and patients with advanced glaucoma, as well as between those with early and those with advanced glaucoma (P < 0.05). The kinetics of the red and blue PIPRs were not significantly different between any groups. Normal age-matched participants and patients with early-stage glaucoma were not significantly different on any parameter, and neither was the normal and glaucoma group (advanced and early combined).

Conclusions
Persons with moderate and severe glaucoma have a dysfunctional ipRGC-mediated PIPR. Intrinsically photosensitive retinal ganglion cell function measured directly with the PIPR may become a clinical indicator of progressive changes in glaucoma.
Keyword Retinohypothalamic tract
Light
Melatonin
Responses
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Medicine Publications
 
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