guidelines for Reading Dickinson's Poetry
b. eye rhyme: rhyme that appears correct from the spelling but is not so from the pronunciation, such as watch/match, love/move, through/enough.
c. true rhyme: identity of terminal sound between accented syllables, usually occupying corresponding positions in two or more lines of verse. The correspondence of sound is based on the vowels and succeeding consonants of the accented syllables, which must, for a true rhyme, be preceded by different consonants. Thus "fan" and "ran" constitute a true rhyme because the vowel and succeeding consonant sounds ("an") are the same but the preceding consonant sounds are different.
Source: Donna Campbell, Washington State University: http://public.wsu.edu/~campbelld/amlit/dickpoems.html