He had gone to the eye doc, that's why he was dilated.
I personally had a retina tear several years ago that followed an ocular vein occlusion a month earlier (starburst). Not a pleasant thing, I have a permanent "floater" from the tear that can be an annoyance.
Actually, we spent most of the discussion talking about vision issues, rather than my bike. I just recently had cataract lens surgery in the same eye with some complications just hours after my surgery. Tremendous pressure that required "burping" (i.e., opening the incision and dripping the fluid- yep, really). The resulting eye drops made me quite weak, preventing my usual work outs. Pressure was normal after a couple of weeks. My vision is still changing after a couple months and very sensitive to light now. I hope to get my final prescription checked in a few weeks, this after a couple of interim changed to my glasses. Sorry- more info that was required.....