The purpose of this study was to investigate the use of optical coherence tomography angiography (OCTA) as a screening tool for anterior segment ischemia (ASI) in strabismus surgery. Optical coherence tomography angiography measurements were taken in 18 subjects. Twelve were excluded with bad quality images, typically in younger children. Best images were from adults aged 19-22 years. It was found to be too time consuming to screen all four quadrants. One subject was excluded with excessive variation in pupil size. Therefore, measurements were mainly analysed for five subjects. Mean age was 45.2 years (19–63 years) and 40% were female. Postoperatively, normal ocular findings were found and no ASI. Of 18 originally tested, 17 had one image of sufficient quality to allow qualitative analysis of iris vasculature. No filling defects were identified pre to post surgery. A decrease in vascular density was found of 2.316% (not significant). Further quantitative analysis with best quality images (five subjects) found a significant difference of 3.591%. This study has highlighted the limitations in achieving good image quality and repeatability. The results indicate OCTA can give gross information on iris vasculature. However, further refinement of OCTA is needed with future studies.
Optical coherence tomography angiography usability in measuring iris vasculature in strabismus surgery
Reviewed by Fiona Rowe
The use of optical coherence tomography angiography to measure changes in iris vasculature after strabismus surgery.
CONTRIBUTOR
Fiona Rowe (Prof)
Institute of Population Health, University of Liverpool, UK.
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