JillyBeJoyful alerted me to the fact that those horrible captchas which are totally illegible are Blogger's default. I had thought that mine were still the easy-to-read ones they were when I decided to add comment captchas.
Anyway, they're gone now. I can't read them, and I'm 20 and have excellent vision. I can't imagine what sight-impaired or more, shall we say, well-seasoned people do. If I get a lot of spam I'll moderate comments, but I'm not too worried. Those captchas are not an option to me!
2 hours ago