In vivo imaging of the photoreceptor mosaic of a rod monochromat. Vision Res 2008 Nov;48(26):2564-8
Date
05/24/2008Pubmed ID
18499214Pubmed Central ID
PMC2582057DOI
10.1016/j.visres.2008.04.006Scopus ID
2-s2.0-55149089278 (requires institutional sign-in at Scopus site) 74 CitationsAbstract
Complete achromatopsia (i.e., rod monochromacy) is a congenital vision disorder in which cone function is absent or severely diminished, often due to mutations in one of two components of the cone phototransduction cascade (transducin or the cyclic-nucleotide gated channel). Previous histological data concerning cone structure are conflicting; suggesting anywhere from normal numbers of foveal cones to a complete absence of foveal cones. Here, we used an adaptive optics ophthalmoscope to obtain in vivo retinal images from a rod monochromat for whom the genetic basis of the disorder consists of a homozygous mutation in the CNGB3 gene. Behavioral data from the patient were consistent with an absence of cone function. Retinal images revealed a severely disrupted photoreceptor mosaic in the fovea and parafovea, where the size and density of the visible photoreceptors resembled that of normal rods. Imaging of additional rod monochromats to characterize differences in the photoreceptor mosaic between genetically classified patients will be required to determine which, if any, might be receptive to restorative gene therapy procedures.
Author List
Carroll J, Choi SS, Williams DRAuthor
Joseph J. Carroll PhD Director, Professor in the Ophthalmology and Visual Sciences department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdultCell Size
Color Vision Defects
Cyclic Nucleotide-Gated Cation Channels
Female
Humans
Male
Middle Aged
Mutation
Ophthalmoscopy
Phenotype
Retinal Cone Photoreceptor Cells
Retinal Rod Photoreceptor Cells
