On the axial location of Gunn's dots
Daniel X Hammer, Zhuolin Liu, Jenna A Cava, Joseph Carroll, Osamah Saeedi, Daniel X Hammer, Zhuolin Liu, Jenna A Cava, Joseph Carroll, Osamah Saeedi
Abstract
Purpose: To determine the axial location of Gunn's dots in the retina.
Methods: Adaptive optics scanning laser ophthalmoscopy (AOSLO) images and adaptive optics - optical coherence tomography (AO-OCT) volumes were collected from a region where Gunn's dots were found inferior to the optic disc from a subject determined by clinical examination to be a glaucoma suspect. AO-OCT volumes were also collected along the horizontal and vertical meridians from six healthy subjects and one glaucoma subject to identify and document other occurrences of Gunn's dots. AO-OCT volumes were registered in three-dimensions and averaged. Gunn's dots were segmented, and their volume, area, and diameter were measured.
Results: All Gunn's dots imaged in this study from all subjects were confined to the inner limiting membrane, neither extending into the vitreous nor into the nerve fiber layer. The size of the dots was highly variable. The measured volume, area, and diameter (mean ± standard deviation) were 1119.9 ± 590.9 μm3, 220.2 ± 105.5 μm2, and 14.3 ± 3.1 μm, the latter within the range as previously published reports.
Conclusions: Based upon evidence from this study and others, Gunn's dots are not thought to be Müller cell end-feet or hyalocytes. We hypothesize that they are related to microglia, either as the by-product of their phagocytosis function, or are actual dead ameboid-shaped microglia who have fulfilled their scavenger role in retinal pathology. Further studies are needed in diseased eyes to determine if they have predictive value.
Keywords: AO-OCT; AOSLO; Gunn's dots; Hyalocyte; Microglia; Müller cells.
Conflict of interest statement
Dr. Carroll received non-financial support from Optovue, Inc, grants from AGTC, personal fees and non-financial support from Meira GTx, and personal fees from Translational Imaging Innovations outside the scope of the submitted work. Dr. Saeedi received personal fees and non-financial support from Heidelberg Engineering, and a grant from Vasoptic Medical Inc. outside the scope of the submitted work.
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Source: PubMed