Welcome to our store Color blindness is a genetic abnormality or the inability of eye cones cells to capture a specific spectrum of color due to genetic factors. This color blindness is a genetic abnormality derived from our parents' genes, so if you have color-blind parents, you are likely to have color blindness, too. This Ishihara 14 Plates book is often used in puskesmas, private doctor practices, type D hospitals, type C hospitals, Dinkes, clinics, labs, schools, opticals, medicine halls, health postals, etc. Thank YOU Items price includes shipping fee that should be borne by the buyer.