You wouldn't expect there to be many similarities between the chameleon (a reptile) and the sandlance (a fish), yet it seems that they use similar visual systems. Both can move their two eyes independently and alternately, and both use their cornea (rather than the lens) to focus on objects. These refinements allow them to gauge depth and distance with one eye, and must have evolved separately in the two species in response to environmental constraints.
机构:
Washington Univ, Sch Med, Div Emergency Med, 660 South Euclid,Campus Box 8072, St Louis, MO 63110 USAWashington Univ, Sch Med, Div Emergency Med, 660 South Euclid,Campus Box 8072, St Louis, MO 63110 USA
Schwarz, Evan S.
Mullins, Michael E.
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Washington Univ, Sch Med, Div Emergency Med, 660 South Euclid,Campus Box 8072, St Louis, MO 63110 USAWashington Univ, Sch Med, Div Emergency Med, 660 South Euclid,Campus Box 8072, St Louis, MO 63110 USA
Mullins, Michael E.
Liss, David
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Washington Univ, Sch Med, Div Emergency Med, 660 South Euclid,Campus Box 8072, St Louis, MO 63110 USAWashington Univ, Sch Med, Div Emergency Med, 660 South Euclid,Campus Box 8072, St Louis, MO 63110 USA