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Clinical Assessment of a Customized Free-form Progressive Addition Lens Spectacle (CZV_PAL1)

17 april 2017 bijgewerkt door: Meng C. Lin, University of California, Berkeley
The purpose of this study was to compare objective clinical measures of visual performance and subjective measures of satisfaction and preference between standard progressive addition lens (PAL) spectacles and a new type of free-form surfaced, optically customized PAL spectacle.

Studie Overzicht

Toestand

Voltooid

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

In a double-masked crossover trial, 95 experienced wearers wore customized free-form PAL spectacles (Test) and standard non-free-form PAL spectacles (Control) for one week each. All subjects wore both Test and Control spectacles, and the pair to be worn first was randomly assigned. At dispensing and after 1 week of wear, subjects were tested for distance and near visual acuity (VA) under both high and low contrast; in addition, 30 degree off-axis VA was measured using a novel apparatus, as was the horizontal extent of undistorted vision at reading distance. Subjects also completed a set of questionnaires detailing their satisfaction levels, adaptation times, and preferences for Test or Control spectacles for different visual tasks.

Studietype

Ingrijpend

Inschrijving (Werkelijk)

95

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studie Locaties

  • Verenigde Staten
    • California
      • Berkeley, California, Verenigde Staten, 94720-2020
        • Clinical Research Center, School of Optometry, University of California, Berkeley

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

39 jaar tot 80 jaar (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Ja

Geslachten die in aanmerking komen voor studie

Allemaal

Beschrijving

Inclusion Criteria:

  • Presbyope
  • Experienced PAL spectacle wearer
  • Correctable to at least 20/25 in both eyes
  • Able and willing to use Test and Control spectacles for 1 week each as primary form of presbyopia correction
  • Able and willing to complete all laboratory measurements and questionnaire batteries

Exclusion Criteria:

  • Purchasing free-form PAL spectacles from the UC Berkeley Eyewear Center
  • Having eye conditions or diseases that could potentially cause a decrease in visual acuity over the course of participation in the study
  • Having eye conditions or diseases that could potentially interfere with ability to use Test and Control spectacles as primary form of presbyopia correction

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Crossover-opdracht
  • Masker: Dubbele

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Actieve vergelijker: Randomized Order of Interventions 1
Randomized to first wear standard, non-free-form, non-customized PAL spectacles, then second, crossover to wear individually customized free-form surfaced PAL spectacles
Apparaat: Standard, non-free-form, non-customized PAL spectacles
Control spectacles include several different PAL brands as selected by patients in the UC Berkeley Optometry Clinic and purchased in the Eyewear Center; after successful fitting and purchase, potential subjects were recruited for the trial.
Apparaat: Individually customized free-form surfaced PAL spectacles
Test spectacles are Zeiss Individual, free-form surfaced, and customized using the iTerminal device to account for individual back vertex distance, wrap angle and pantoscopic tilt
Andere namen:
  • Zeiss Individual, Carl Zeiss Vision, Inc., Germany
Actieve vergelijker: Randomized Order of Interventions 2
Randomized to first wear individually customized free-form surfaced PAL spectacles, then second, crossover to wear standard, non-free-form, non-customized PAL spectacles
Apparaat: Standard, non-free-form, non-customized PAL spectacles
Control spectacles include several different PAL brands as selected by patients in the UC Berkeley Optometry Clinic and purchased in the Eyewear Center; after successful fitting and purchase, potential subjects were recruited for the trial.
Apparaat: Individually customized free-form surfaced PAL spectacles
Test spectacles are Zeiss Individual, free-form surfaced, and customized using the iTerminal device to account for individual back vertex distance, wrap angle and pantoscopic tilt
Andere namen:
  • Zeiss Individual, Carl Zeiss Vision, Inc., Germany

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Visual Acuity, High Contrast, Distance Chart
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Standard assessment of high contrast visual acuity at distance, as in normal clinical practice, using Baily-Lovey charts and the M&S Technologies Smart System II visual acuity projection system.
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Visual Acuity, Low Contrast, Distance Chart
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Standard assessment of low contrast visual acuity at distance, as in normal clinical practice, using Baily-Lovey charts and the M&S Technologies Smart System II visual acuity projection system.
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Visual Acuity, High Contrast, Near Chart
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Standard assessment of high contrast visual acuity at near, as in normal clinical practice, using Baily-Lovey charts and the M&S Technologies Smart System II visual acuity projection system.
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Visual Acuity, Low Contrast, Near Chart
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Standard assessment of low contrast visual acuity at near, as in normal clinical practice, using Baily-Lovey charts and the M&S Technologies Smart System II visual acuity projection system.
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
30-degree Off-axis Distance Visual Acuity, High Contrast Chart
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Measured with subject immobilized in specially designed apparatus, keeping head pointed straight forward and moving only the eyes to left or right to view the off-axis chart
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
30-degree Off-axis Distance Visual Acuity, Low Contrast Chart
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Measured with subject immobilized in specially designed apparatus, keeping head pointed straight forward and moving only the eyes to left or right to view the off-axis chart
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Horizontal Extent of Undistorted Vision at Reading Distance
Tijdsspanne: Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Novel apparatus designed to immobilize head and allow subject to indicate point of peripheral optical distortion on a modified Amsler-type grid
Post-1 week of wear of Test Spectacles and post-1 week of wear of Control Spectacles
Questionnaire Battery
Tijdsspanne: At study exit, after both Test and Control spectacles had been worn for 1 week each
Forced-choice Likert scale preference questionnaire
At study exit, after both Test and Control spectacles had been worn for 1 week each

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

University of California, Berkeley

Medewerkers

Carl Zeiss Meditec, Inc.

Onderzoekers

  • Hoofdonderzoeker: Meng C. Lin, OD, PhD, Clinical Research Center, School of Optometry, University of California, Berkeley

Publicaties en nuttige links

De persoon die verantwoordelijk is voor het invoeren van informatie over het onderzoek stelt deze publicaties vrijwillig ter beschikking. Dit kan gaan over alles wat met het onderzoek te maken heeft.

Algemene publicaties

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start

1 februari 2009

Primaire voltooiing (Werkelijk)

1 oktober 2009

Studie voltooiing (Werkelijk)

1 oktober 2009

Studieregistratiedata

Eerst ingediend

3 november 2010

Eerst ingediend dat voldeed aan de QC-criteria

3 november 2010

Eerst geplaatst (Schatting)

4 november 2010

Updates van studierecords

Laatste update geplaatst (Werkelijk)

18 april 2017

Laatste update ingediend die voldeed aan QC-criteria

17 april 2017

Laatst geverifieerd

1 april 2017

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • CZV_PAL1

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