"eye chart" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Dates manquantes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Date à préciser) → voir eye et chart"
  ],
  "forms": [
    {
      "form": "eye charts",
      "ipas": [
        "\\ˈaɪ ˈtʃɑːts\\"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              84,
              93
            ]
          ],
          "text": "The doctor said I needed glasses after I failed to read past the fourth line on the eye chart.",
          "translation": "Le docteur a dit que j’ai besoin de lunettes après que j’ai échoué à lire au-delà de la quatrième ligne du tableau de lettres / du tableau optométrique."
        }
      ],
      "glosses": [
        "Tableau optométrique."
      ],
      "id": "fr-eye_chart-en-noun-47k6w-hy",
      "tags": [
        "formal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈaɪ ˈtʃɑːt\\"
    }
  ],
  "word": "eye chart"
}

{
  "categories": [
    "Dates manquantes en anglais",
    "Locutions nominales en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "(Date à préciser) → voir eye et chart"
  ],
  "forms": [
    {
      "form": "eye charts",
      "ipas": [
        "\\ˈaɪ ˈtʃɑːts\\"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Exemples en anglais"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              84,
              93
            ]
          ],
          "text": "The doctor said I needed glasses after I failed to read past the fourth line on the eye chart.",
          "translation": "Le docteur a dit que j’ai besoin de lunettes après que j’ai échoué à lire au-delà de la quatrième ligne du tableau de lettres / du tableau optométrique."
        }
      ],
      "glosses": [
        "Tableau optométrique."
      ],
      "tags": [
        "formal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈaɪ ˈtʃɑːt\\"
    }
  ],
  "word": "eye chart"
}