eyeless is the
gene in
Drosophila that
regulates development of the
eye. Its symbol is
ey, its
cytological map position is 102C, and the
FlyBase ID (whatever that is) is FBgn0005558.
When eyeless is turned on in a bit of fruit fly other than the usual front-of-its-head region, it grows eyes there: wings, legs, anywhere. The eyes are morphologically normal, with fully differentiated ommatidia and photoreceptors.
Homologous genes are found right across the metazoa.
Richard Dawkins says it's a damn silly idea to name a gene after the opposite of its actual function.
Aldous Huxley wrote a novel Eyeless in Gaza in 1936, which is itself a Biblical quotation.