trifocal lenses
type: Thing
alternate name: trifocals
description: eyeglass lens with three distinct optical powers
additional property: PropertyValue
  property ID: P61
  value: John Isaac Hawkins
additional property: PropertyValue
  property ID: P279
  value: lens
additional property: PropertyValue
  property ID: P575
  value: 1827
additional property: PropertyValue
  property ID: P646
  value: /m/036sth
additional property: PropertyValue
  property ID: P6366
  value: 2776569707
confidence:
  popularity graph score:
    score: 0.005
    score pct: 1
    tier: long_tail
    components:
      sitelinks: 6
      sitelinks norm: 0.014
      unique citations: 1
      unique citations norm: 0.0
      monthly pageviews: 137
      monthly pageviews norm: 0.0
  sitelinks: 6
  unique citations: 1
  monthly pageviews: 137
  yearly pageviews: 231
  pageview trend:
    m: 2026-08
    v: 137
  pageview trend:
    m: 2026-07
    v: 23
  pageview trend:
    m: 2026-06
    v: 27
  pageview trend:
    m: 2026-05
    v: 12
  pageview trend:
    m: 2026-04
    v: 32
  popularity:
    sitelinks: 6
    max: 423
    pct: 1.4
  tier: long_tail
claims:
  P61:
    value: Q6240895
    source count: 0
    confidence: 0.0
    value label: John Isaac Hawkins
  P279:
    value: Q768575
    source count: 0
    confidence: 0.0
    value label: lens
  P575:
    value: +1827-00-00T00:00:00Z
    source count: 1
    confidence: 0.2
  P646:
    value: /m/036sth
    source count: 0
    confidence: 0.0
  P6366:
    value: 2776569707
    source count: 0
    confidence: 0.0
citations:
  retrieved: 2020-05-09
meta:
  wikidata id: Q7841511
  domain: general
  level: standard
  html url: https://4ort.xyz/entity/trifocal-lenses
  markdown url: https://4ort.xyz/entity/trifocal-lenses.md
  facts url summary: https://4ort.xyz/entity/trifocal-lenses/facts.json
  facts url standard: https://4ort.xyz/entity/trifocal-lenses/facts.json
  facts url full: https://4ort.xyz/entity/trifocal-lenses/facts.json
  data source: Wikidata (CC0 / public domain)
  license: https://creativecommons.org/publicdomain/zero/1.0/
  api version: v1
  served at: 2026-08-19T11:46:22.001500Z
  entity updated at: 2026-04-10T23:31:24.453676+00:00Z
  entity created at: 2026-04-10T23:31:24.453676+00:00Z