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Figure 2: Ultrasonic measurement of retinal shortening. (a) Ultrasound B-scan of an eye with retinal detachment and proliferative vitreoretinopathy. A retinal fold (encircled) with overlying adherent vitreous can be seen. (b) Figure depicts setting up a scale for further measurements. Note the yellow line, indicated by arrowheads, placed over the vector scan. This pixel distance was set as 10 mm, and future measurements were done accordingly. (c) The process of retinal length measurement. The measuring yellow line has been drawn along the retinal contour, the end points being the optic disc, and point of fusion of neurosensory retina with the retinal pigment epithelial-choroid (arrowheads). In this case, the retinal length was measured as 12.44 mm after taking 5 readings. (d) The process of choroidal length measurement. The end points used for retinal length (arrowheads) were used for measuring the choroidal length, drawn as a curved yellow line along its length. In this case, the choroidal length was measured as 15.95 mm after taking 5 readings. The retinal-to-choroidal length ratio was hence measured as 0.78 |
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