Whence  it  follows,  that  the  eye  must  unavoidably  be
mistaken,  since  it  will  take  the  confusions  in  the  sense  it
has  been  used  to,  which  is  directly  opposed  to  the  true.
26  Berkeley's  Works

XXXIII.  This   phenomenon,  as   it  entirely  subverts
the  opinion  of  those  who  will  have  us  judge  of  distance
by  lines  and  angles,  on  which  supposition  it  is  altogether
inexplicable,  so  it  seems  to  me  no  small  confirmation
of  the  truth  of  that  principle  whereby  it  is  explained.
But  in  order  to  a  more  full  explication  of  this   point,
and   to    show   how   far   the  hypothesis   of  the   mind's
judging  by  the  various  divergency  of  rays  may  be  of
use  in  determining  the  apparent  place  of  an  object,  it
will   be  necessary  to  premise  some  few  things,  which
are  already  well  known  to  those  who  have  any  skill  in
dioptrics.
XXXIV.  First,  any  radiating  point  is  then  distinctly
seen,   when    the   rays  proceeding  from  it  are,   by  the
refractive  power  of  the  crystalline,  accurately  reunited
in  the  retina,  or  fund  of  the  eye.     But  if  they  are  re-
united, either  before  they  are  at  retina,  or  after   they
have  passed  it,  then  there  is  confused  vision.
