Superficially, I agree they have a lot in common.
1) Visually? Yeah, they're both visual. But then again, so is path. And radiology. I really wouldn't mention "being visual" as a reason to pursue either field in an interview. PDs have heard it a million times.
2) Both offer a nice mixture of surgical/procedural interventions but ophtho is much heavier than this than dermatology. At our school, ophtho is considered a surgical sub-specialty.
3) See Point #2, again both offer a nice mixture of clinic/procedures. But the ophtho residents spend a lot more time in the OR/doing procedures than the derm residents.
4) Again, both are highly specialized. But there's a different degree. In one case, you're staring at two organs only. In the other, you're covering an entire body and investigating the internal processes that may create external manifestations.
Perhaps I'm just cynical but I always find it hard to believe that someone could like both equally. Especially when they come to a forum looking for lifestyle/call/salary reasons to select one over the other.
Simple answer: you'll live a more than comfortable lifestyle and make better than average money in both fields. I will agree it comes down to picking the one you are actually enthusiastic about.
I have to disagree, respectfully...derm and ophtho actually have a lot in common.
--they are both very visual (pattern recognition oriented)
--both surgical/procedural
--mostly clinic + OR/procedures (NOT hospital based)
--highly specialized
I can see how you like them both. I considered ophtho myself before deciding on dermatology.
First off, they are both fantastic fields. What it really comes down to is what you can see yourself LOVING each and every day. Med school + residency is a lot of work, and in the end, only you can decide what is worth it. Which field excites you more...which can you see yourself still enjoying after 20 years? Which field would you rather read about on a rainy day? I'd recommend doing some "soul searching" and perhaps some additional rotations (away or at home) before making your decision.
Good luck!