Here’s a very close up closeup of the eye of one of my favourite birds, the great Indian hornbill. This took a while to get as the individual in question was rather active and while the focus isn’t *quite* right I’m pleased with the outcome. I wanted this shot as hornbills are a really good example of odd feather specialisations with their ‘eyelashes’. These are of course feathers and thus analogous, but not homologous, with the eyelashes of mammals.
Still their presence leads me to wonder if similar things didn’t evolve in theropods or pterosaurs. These feathers are just short and stiff, simple fibers of the kind seen in basal taxa so should be structurally easy to produce. Animals like tyrannosaurs or azhdarchoids probably couldn’t rub or lick their own eyes to clean them, but had large eyeballs that would be vulnerable to dirt etc. or from vision being obscured by rain etc. It seems at least plausible and while I don’t look at these things religiously, I don’t think I’ve ever seen an extinct theropod or pterosaur illustrated with them, and I’ve not seen any discussion in the literature at any point.