My optometrist had recently installed a new imaging system and offered to do these ultra-widefield retinal images for you. The only catch was that insurance didn't cover it, so you had to pay $50. I said sure, so long as I got the JPEGs. They were happy to do that.
Here's my left eye:
And here's my right eye:
If your optometrist or ophthalmologist offers this service, I say take it. It helps them get a better view of certain parts of your eye, which is good for detecting diseases or conditions that have no symptoms until it's too late. Plus it's fun because you get the images to take home.
I had about a hundred technical questions about the equipment, which they were not at all prepared to answer. For the few minutes I interacted with the system, I could tell it was a camera about the size of a refrigerator. They ask you to hug the machine, open your eye wide, and get it as close to the lens (or whatever it is) as possible. There's a large flash and it's over. They repeat until they get images they like. Do the same process for the other eye.