1997h-049 congresses diseases earlyworksto1800 eye history instrumentation lenses ocular ocularphysiologicalphenomena ocularvision ophthalmology opticalinstruments optics opticsandphotonics optiquephysiologique optometry photochemistry photoreceptorcells physiologie physiology physiopathology qp475 retinalpigments sensetsensations testing traitement treatment troublesdelavision vision visiondisorders visualpathways ww26s648e1997