The Collaborative International Dictionary of English v.0.48:

Bisson \Bis"son\, a. [OE. bisen, bisne, AS. bisen, prob. for
   b[imac]s?ne; bi by + s?ne clear, akin to se['o]n to see;
   clear when near, hence short-sighted. See See.]
   Purblind; blinding. [Obs.] "Bisson rheum." --Shak.
   [1913 Webster] Bister