I think touch is the most important. Not being able to hug my children or kiss my wife anymore would be more devastating then losing sight in the long run. Plus touch can help you see, sight can't help you feel.
Touch > sight > hearing > taste > smell
Read this and decide if you can cope better without sight or touch
http://www.ydr.com/living/ci_15326760
Losing both would make it impossible to function.







