Intrinsically photosensitive (Melanopsin) retinal ganglion cell function in glaucoma

Feigl, Beatrix, Mattes, Dietmar, Thomas, Ravi, & Zele, Andrew J. (2011) Intrinsically photosensitive (Melanopsin) retinal ganglion cell function in glaucoma. Investigative Ophthalmology and Visual Science, 52(7), pp. 4362-4367.

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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.

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ID Code: 52332
Item Type: Journal Article
Refereed: Yes
Funders: ARC
DOI: 10.1167/iovs.10-7069
ISSN: 0146-0404
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > NEUROSCIENCES (110900)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: 2011 Association for Research in Vision and Ophthalmology
Deposited On: 19 Jul 2012 06:29
Last Modified: 09 Dec 2016 05:09

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