Macular spatial distribution of preserved autofluorescence in patients with choroideremia.

Kimberly Stepien // Publications // Oct 10 2018

PubMed ID: 30297337

Author(s): Hariri AH, Ip MS, Girach A, Lam BL, Fischer MD, Sankila EM, Pennesi ME, Holz FG, Maclaren RE, Birch DG, Hoyng CB, MacDonald IM, Black GC, Tsang SH, Bressler NM, Stepien KE, Larsen M, Gorin MB, Meunier I, Webster AR, Sadda S; For Natural History of the Progression of Choroideremia (NIGHT) Study Group. Macular spatial distribution of preserved autofluorescence in patients with choroideremia. Br J Ophthalmol. 2019 Jul;103(7):933-937. doi: 10.1136/bjophthalmol-2018-312620. Epub 2018 Oct 8.

Journal: The British Journal Of Ophthalmology, Volume 103, Issue 7, Jul 2019

BACKGROUND/AIMS To better understand the pattern of degeneration progression in cases with choroideremia.

METHODS A cohort of genotypically confirmed choroideremia cases who underwent optical coherence tomography (OCT) and fundus autofluorescence (FAF) imaging was studied. Using HEYEX review software, the foveal centre was marked on FAF images under guidance of corresponding OCT images, followed by application of an ETDRS grid. The boundaries of preserved autofluorescence (AF) were manually segmented in each individual ETDRS subfield. The regional distribution of preserved AF was assessed by comparing its area among the various subfields.

RESULTS A total of 168 eyes from 84 choroideremia cases were enrolled. There was a statistically significant difference in the amount of preserved AF area between inner subfields as determined by one-way analysis of variance (F (3,668)=9.997, p<0.001) and also between outer subfields (F (3,668)=8.348, p<0.001). A Tukey posthoc test revealed that the preserved AF area in the nasal subfields in both the inner and outer subfields was significantly smaller compared with analogue subfields.

CONCLUSION The asymmetric spatial distribution of preserved AF in choroideremia (corresponding to the stellate shaped nature of these regions) suggests that the progression of degeneration has directional preference.

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