The dimensions for hooks do vary between manufacturers--- and sometimes within same manufacture for different models of hooks (Mustad just went through a major renaming of their hooks and jiggling with some of the dimensions to bring some standardization within their lineup).
But most hook manufacturers have hooks that are comparable--- at least in intended function.
One thing that might be part of the problem is that wet fly hooks are typically made of heavier wire-- and dries are made of thinner wire making the wire on dries more difficult to see--- something that may be a factor for those of us with gray hair.
Some dry fly hooks like the Daiichi 1100 have over sized eyes, but if close up vision is an issue especially with smaller size hooks (and it sure is for me), you might consider something like these C & F threaders (about $16-17.00):
They come in various sizes:
"standard" for sizes 16-19
"midge" for 20-26
"ultra midge" for sizes 24-32
and both in "standard" and "short" lengths etc. If you use flies that occasionally run down to size 20-22 or so the most useful size would probably be the midge (unless you tie really small stuff and need the "ultra midge") because you can always use the thinner wire of the midge size on larger size hooks too.
Fly Threaders - C&F Fly Threader Sets - C&F Design