"bifocal" meaning in English

{
  "derived": [
    {
      "_dis1": "0 0",
      "word": "bifocality"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bi",
        "3": "focal"
      },
      "expansion": "bi- + focal",
      "name": "prefix"
    }
  ],
  "etymology_text": "bi- + focal",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "bifocal (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "_dis1": "0 0",
      "word": "bifocals"
    },
    {
      "_dis1": "0 0",
      "word": "trifocal"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optics",
          "orig": "en:Optics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "68 32",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "58 42",
          "kind": "other",
          "name": "English terms prefixed with bi-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Having two focal lengths"
      ],
      "id": "en-bifocal-en-adj-csPReK42",
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "focal length",
          "focal length"
        ]
      ],
      "raw_glosses": [
        "(optics) Having two focal lengths"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "glosses": [
        "Divided into two parts, one of which corrects for distance vision and the other for near vision"
      ],
      "id": "en-bifocal-en-adj-GDZNKDxV",
      "links": [
        [
          "distance",
          "distance"
        ],
        [
          "vision",
          "vision"
        ],
        [
          "near",
          "near"
        ]
      ],
      "raw_glosses": [
        "(of a correcting lens) Divided into two parts, one of which corrects for distance vision and the other for near vision"
      ],
      "raw_tags": [
        "of a correcting lens"
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "bifocal"
}

{
  "categories": [
    "English adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English terms prefixed with bi-",
    "English uncomparable adjectives"
  ],
  "derived": [
    {
      "word": "bifocality"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bi",
        "3": "focal"
      },
      "expansion": "bi- + focal",
      "name": "prefix"
    }
  ],
  "etymology_text": "bi- + focal",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "bifocal (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "bifocals"
    },
    {
      "word": "trifocal"
    }
  ],
  "senses": [
    {
      "categories": [
        "en:Optics"
      ],
      "glosses": [
        "Having two focal lengths"
      ],
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "focal length",
          "focal length"
        ]
      ],
      "raw_glosses": [
        "(optics) Having two focal lengths"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "glosses": [
        "Divided into two parts, one of which corrects for distance vision and the other for near vision"
      ],
      "links": [
        [
          "distance",
          "distance"
        ],
        [
          "vision",
          "vision"
        ],
        [
          "near",
          "near"
        ]
      ],
      "raw_glosses": [
        "(of a correcting lens) Divided into two parts, one of which corrects for distance vision and the other for near vision"
      ],
      "raw_tags": [
        "of a correcting lens"
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "bifocal"
}