"keratometry" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "kerato",
        "3": "metry"
      },
      "expansion": "kerato- + -metry",
      "name": "confix"
    }
  ],
  "etymology_text": "kerato- + -metry",
  "forms": [
    {
      "form": "keratometries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "keratometry (countable and uncountable, plural keratometries)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with kerato-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -metry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "measurement with a keratometer"
      ],
      "id": "en-keratometry-en-noun-aPiEUjtG",
      "links": [
        [
          "measurement",
          "measurement"
        ],
        [
          "keratometer",
          "keratometer"
        ]
      ],
      "related": [
        {
          "word": "keratometric"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "keratometry"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "kerato",
        "3": "metry"
      },
      "expansion": "kerato- + -metry",
      "name": "confix"
    }
  ],
  "etymology_text": "kerato- + -metry",
  "forms": [
    {
      "form": "keratometries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "keratometry (countable and uncountable, plural keratometries)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "keratometric"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with kerato-",
        "English terms suffixed with -metry",
        "English uncountable nouns"
      ],
      "glosses": [
        "measurement with a keratometer"
      ],
      "links": [
        [
          "measurement",
          "measurement"
        ],
        [
          "keratometer",
          "keratometer"
        ]
      ],
      "tags": [
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        "uncountable"
      ]
    }
  ],
  "word": "keratometry"
}