Retinal vessel changes after laser treatment for retinopathy of prematurity

BackgroundThe clinical response to retinopathy of prematurity (ROP) treatment is currently assessed subjectively. This study aims to quantify treatment response objectively by assessing changes in digital images of posterior pole retinal vessel width and tortuosity.MethodsImages of 30 right eyes with type 1 ROP obtained at up to three time points were analyzed: before treatment (T = 0) and 1 (T = 1) and/or 2 weeks (T = 2) after treatment. Width and tortuosity of retinal vessels were analyzed from digital images using computer-assisted image analysis software.ResultsVessel width decreased by 20% (P < 0.004) within the first week and remained stable by the second week after laser treatment. Vessel tortuosity did not significantly change by the first week but decreased 27% (P < 0.01) by second week.ConclusionsVessel width appears to decrease dramatic within the first week, whereas the regression of tortuosity follows a slower course.