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Per this answer, the one making havdalah must benefit from the light. How does a blind person make havdalah, assuming there is not another Jew present to do it for him? Does he omit the blessing over the fire, or does he make the blessing and light the candle even though he can't see it?
This question addresses the blind lighting Chanukah candles, but with Chanukah there is another reason to light (to publicize the miracle), which doesn't apply to havdalah.
A blind person cannot make the b'racha of borei m'orei ha'esh on the flame. (Shulchan Aruch OC 298:13) However, he certainly may recite the rest of havdala. (Mishna B'rura 298:34)
The halachic sources say that one needs to see the flame, but it's worth pointing out that it's not a blessing of enjoyment on seeing something, but rather an appreciation of the creation of fire. That's why it's only properly said on Motzaei Shabbat. There's a source in Pirkei d'Rabbi Eliezer, not brought down in halacha, that disconnects the blessing from flames, and possibly also from seeing.
ואם אין לו אש פושט ידו לאור הכוכבים, שהן של אש, ויסתכל בצפרניו שהן לבנות מן הגוף, ואומר ברוך מאורי האש. ואם נתקדרו השמים, תולה אבן מן הארץ ומבדיל ואומר ברוך המבדיל בין קודש לחול.
[If he be on a journey,] he puts forth his hand to the light of the stars, which are also fire, and says: Blessed art Thou, O Lord our God, King of the universe, who creates the various flames of fire. If the heavens be darkened, he lifts up a stone outside, and says: Blessed [art Thou, O Lord our God,] who separates between the sacred and the profane.
