My eyes aren't so good either, I prefer the CC because of the black background, and I prefer the large fonts..... I hate it when they use small case letters sometimes... The thing with SDH which I didn't know what it was until now, and realzie I have bought movies in the past, only to be severely disappointed when I discovered these "subtitles" is that as mentioned by the original poster... if the fonts are white, and the scene is say, shot on a lake ice fishing, the white fonts are pretty darn hard to read! with CC you don't have this problem. I guess I don't like change.
I found that if you use torrents or rapidshare and download your own movies and tv shows, and then you get the subtitles at opensubtitles or other subtitle site, then use a program like VSO to convert, you can define your own size, font, and color. A nice thick arial in large size in yellow or red sticks out like a sore thumb, but you can sure enjoy the show!
Problem is you cannot "disable" those subtitles to lend to a friend, unless they watch on PC and can disable them then.
I would lvoe the ability to select in my dvd player the size and color I want for my CC. that would rock. I have a new Sharp Aquos that was a present to me from Sharp, that is only 21" in HDTV. I sue it for a computer monitor, since the CC that this tv supports are SO THIN and tiny...the font is like a small times new roman..... too small..... really crappy and disappointing. If I could read them at a distance I would maybe put the tv in my bedroom