I weld every day, and the last time I asked my ophthalmologist about things, his response was that the only changes/damage he saw in my eyes were likely the results of 40 years of life more than 20 years of welding.
I think you are more likely to get grit or spatter in your eyes, or trash your lungs, or hurt your hearing while welding with any ANSI compliant helmet than you are likely to hurt your vision through the actions of the arc.
Do be careful about wearing light colors, I think a filthy leather jacket reflects less UV off your chest into your helmet than a new, clean, green coat. A very bright white room would not be my first choice, either.
I'll chime in for the 951P and the Huntsman 1105VS lens. I love it.... I just used a Speedglas fixed 10 shade helmet for a week, and I got way more flash as it kicked in, and the helmet fit quite poorly. I hated it. I'm so happy my new 1105VS came in today!
Stuart