I wear prescription glasses. They really get in the way when taking pictures. I am aware of the diopter adjustment that some cameras have. Is this diopter aid equivalent to reading glasses?
Positive diopter adjustments have the same effect as reading glasses do. Negative diopter adjustments have the same effect as glasses for someone with myopia. My Canon 5D Mark II has a built-in diopter adjustment that ranges from -3 to +1. Other optional lenses are available from Canon that range from -4 to +3 diopters. If you, for instance, add an optional -2 diopter eyepiece to my 5DII, then the internal adjustment would allow a range of -5 to -1 diopters. Most DSLR camera manufacturers also offer such lenses that attach to the rear of the optical viewfinder for at least some of their cameras.
I wear glasses too, but don't find it much of a problem.
If you don't have much astigmatism and your correction is not too extreme, you could adjust the focus of the viewfinder to your uncorrected eye. This is usually called something like a "diopter" setting. However, then you won't be able to see the scene properly when not looking thru the camera. I keep my glasses on, which correct my vision for distance viewing. Camera viewfinders are usually adjusted for distance viewing too (the image appears at infinity), so there is no problem.
About the only real issue with glasses is that you can't get your eye as close to the viewfinder. You need a viewfinder with a more narrow view angle so that all of it can be seen with the eye back a bit. Camera manufacturers are well aware of this. Nikon used to have options for "high eyepoint", but nowadays most cameras come that way standard. It doesn't really detract from using the camer without glasses.
My solution to glasses getting in the way of using the camera was to eventually change my glasses. Instead of ultra-light titanium wire frames I now wear heavier and stiffer metal frames that sit slightly closer to my face, and have smaller (but still quite practical) lenses. Not only is it now easier to see the information in the viewfinder, my glasses are less likely to be knocked askew by contact with an errant eyepiece.
Yes, a positive diopter adjustment is exactly equal to reading glasses. The negative side is the opposite, for nearsightedness.
If the diopter built into the camera isn't sufficient, you may have some other options: see Are there any alternate eyepieces for people with glasses? for some options.
If possible, wearing contacts is really the nicest, but of course that doesn't help everyone. Of course, sometimes the reason contacts aren't an option is that the vision problem is severe astigmatism, and the diopter doesn't do anything for you there either. In that case, you may try mashing your glasses to the viewfinder anyway (I do this in a pinch, and with a viewfinder with a nice eye point it works out okay), or, you may consider adapting your photography habits to use a rear LCD screen -- DSLR "live view" or a mirrorless camera.
One thing I did was to remove the little rectangular rubber part around the viewfinder (on my Canon DSLR bodies. I assume other manufacturers have something similar). This lets me jam my eyeglass-covered face a little bit closer to the viewfinder, so that I can see more of the viewfinder. It's not a total solution but it's an improvement.