A bovine eye chart. Source.
I have a complaint. Scientific papers can be quite demanding to read. So, why make life more difficult by making the legends of the figures so hard to read? My big complaint is that when a legend pertains to multiple parts, the letters corresponding to them are nearly invisible. Try finding the (c), (d), or (e) in the legend. For heaven’s sake, what is so hard about showing these in bold letters? Besides, life would be simpler if there were fewer images or if they weren’t grouped so tightly.
Next time you write a paper, tell the editor that you want the letters in figure legends to be in bold face. Thank you in the name of all of us.