1968 1999g-975 2008f-395 anatomy birds brain congresses diagnosis diagnostictechniques diseases eye eyediseases geneexpressionregulation genetics histology instrumentation lenses methods molecularaspects moleculargenetics ocular ophthalmological ophthalmology opticsandphotonics optometry physiologicaloptics physiology ql698v8311993 therapy treatment vision visualpathways visualperception ww100 ww100a3332008 ww103a237p ww103a237p1981 ww103n27681988m ww103o98h1999