3 times in the past 8-9 months I have had a floating distortion in my field of vision - difficult to discern in detail but something like a (slightly curved?) L shape made up of a train of smaller L shapes (or triangles), situated to the left side of my field of vision and lasting for less than an hour in each case. I have had several bouts of laser surgery to repair a slight retinal tear in the past 20 years but have been in the clear for my past 2 bi-annual checkups. The line is sometimes partially coloured and has a geometric quality to it like diffracted light. It has a similar appearance to the 'Front Lines' depicted in weather maps. Is this something anyone else has experienced?