@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_blemish_	skos:broader	isac:visual_defect_ .
isac:_astigmatism_	skos:broader	isac:visual_defect_ .
isac:_spot_	skos:broader	isac:visual_defect_ .
isac:_scratch_	skos:broader	isac:visual_defect_ .
isac:_discoloration_	skos:broader	isac:visual_defect_ .
isac:_amblyopia_	skos:broader	isac:visual_defect_ .
isac:_myopia_	skos:broader	isac:visual_defect_ .