The one-word form is occurring more frequently, especially when
used in adjectival form and in the eyecare business, in which I am
employed. "Eyecare" doesn't appear in most dictionaries, apparently
because assumption is that it is two words, and "eye care" is the
more common spelling. However, in my opinion, logic and the
spelling evolutionary process (two words, then hyphenated, then one
word) favor the one-word spelling "eyecare". -CRM