Patent ID: 7379586

Claim:
A color vision characteristic detection apparatus comprising: a storage section that stores at least one piece of first image data that comprises pattern element sets containing: a first pattern element set colored in a color belonging to a first set of colors confusing to a person who has a visual characteristic of a first color vision characteristic type; a second pattern element set colored in a color belonging to a second set of colors confusing to a person who has a visual characteristic of a second color vision characteristic type, wherein the first pattern element set defines a first symbol character shape and the second pattern element set defines a second symbol character shape, which is different from the first symbol character shape; at least one piece of second image data that comprises a third pattern element set colored in a color belonging to a third set of colors confusing to a person who has a visual characteristic of a third color vision characteristic type; a presenting section that presents the first image data to a user; and a determination section that accepts a user's entry of information concerning a symbol read from the first image data presented and determines based on the entered information whether or not the second image data is to be presented to the user.