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Relationship between the Foveal Avascular Zone and Foveal Pit Morphology

Dubis, AM; Hansen, BR; Cooper, RF; Beringer, J; Dubra, A; Carroll, J; (2012) Relationship between the Foveal Avascular Zone and Foveal Pit Morphology. Investigative Opthalmology & Visual Science , 53 (3) pp. 1628-1636. 10.1167/iovs.11-8488. Green open access

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Abstract

Purpose.: To assess the relationship between foveal pit morphology and size of the foveal avascular zone (FAZ). Methods.: Forty-two subjects were recruited. Volumetric images of the macula were obtained using spectral domain optical coherence tomography. Images of the FAZ were obtained using either a modified fundus camera or an adaptive optics scanning light ophthalmoscope. Foveal pit metrics (depth, diameter, slope, volume, and area) were automatically extracted from retinal thickness data, whereas the FAZ was manually segmented by two observers to extract estimates of FAZ diameter and area. Results.: Consistent with previous reports, the authors observed significant variation in foveal pit morphology. The average foveal pit volume was 0.081 mm3 (range, 0.022 to 0.190 mm3). The size of the FAZ was also highly variable between persons, with FAZ area ranging from 0.05 to 1.05 mm2 and FAZ diameter ranging from 0.20 to 1.08 mm. FAZ area was significantly correlated with foveal pit area, depth, and volume; deeper and broader foveal pits were associated with larger FAZs. Conclusions.: Although these results are consistent with predictions from existing models of foveal development, more work is needed to confirm the developmental link between the size of the FAZ and the degree of foveal pit excavation. In addition, more work is needed to understand the relationship between these and other anatomic features of the human foveal region, including peak cone density, rod-free zone diameter, and Henle fiber layer.

Type: Article
Title: Relationship between the Foveal Avascular Zone and Foveal Pit Morphology
Open access status: An open access version is available from UCL Discovery
DOI: 10.1167/iovs.11-8488
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
URI: https://discovery.ucl.ac.uk/id/eprint/10069874
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