Examen de la progresión de la miopía y control de la miopía con lentes de contacto bifocales blandas (BLINK2)
Examen de la progresión de la miopía y las consecuencias y los mecanismos del control de la miopía con lentes de contacto bifocales blandas
Descripción general del estudio
Descripción detallada
Tipo de estudio
Inscripción (Actual)
Fase
- No aplica
Contactos y Ubicaciones
Ubicaciones de estudio
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Ohio
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Columbus, Ohio, Estados Unidos, 43210
- Ohio State University
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Texas
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Houston, Texas, Estados Unidos, 77204
- University of Houston
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Método de muestreo
Población de estudio
Descripción
Criterios de inclusión:
- Participantes en el estudio BLINK
Criterio de exclusión:
-
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
Cohortes e Intervenciones
Grupo / Cohorte |
Intervención / Tratamiento |
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Contact lens
The first two years of the study all participants will wear +2.50 D multifocal contact lenses.
The last year of the study, all subjects will be wearing single vision contact lenses.
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2.50 D multifocal contact lens years 1 and 2. Year 3 all wear a single vision contact lens.
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¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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The Statistical Correlation Between Three-year Change in Choroidal Thickness and Three-year Change in Axial Length
Periodo de tiempo: Three years
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test the hypothesis that thinner subfoveal choroidal thickness (a layer of blood vessels) is associated with the outcome of greater axial elongation (eye growth) The hypothesis relates to the two years of multifocal contact lens wear and one year of single vision contact lens wear. As such, it uses the entire sample which experiences the same contact lens wear in the BLINK2 Study. |
Three years
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The Statistical Correlation Between iPRGC Activity at BLINK2 Baseline and Three-year Change in Axial Length
Periodo de tiempo: Three years
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test the hypothesis that less ipRGC activity (cells in the back of the eye as measured by blue light-driven inputs to the pupil response - measured by the blue decay coefficient) as measured at the Baseline BLINK 2 is associated with greater axial elongation (eye growth) over three years The hypothesis relates to the two years of multifocal contact lens wear and one year of single vision contact lens wear. As such, it uses the entire sample which experiences the same contact lens wear in the BLINK2 Study. |
Three years
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The Statistical Correlation Between Light Levels Measured at Baseline and Three-year Change in Axial Length
Periodo de tiempo: Three years
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test the hypothesis that exposure to light levels over 1000 lux as measured at the Baseline BLINK2 visit is associated with less axial elongation (eye growth) over three years The hypothesis relates to the two years of multifocal contact lens wear and one year of single vision contact lens wear. As such, it uses the entire sample which experiences the same contact lens wear in the BLINK2 Study. |
Three years
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Three-year Choroidal Thickness Change
Periodo de tiempo: 3 years
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The three-year change from baseline to three years for choroidal thickness.
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3 years
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Duration of Exposure to Light Levels Exceeding 1000 Lux at Baseline
Periodo de tiempo: Baseline
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Baseline light exposure as measured by minutes at light levels over 1000 lux.
Light exposure was monitored using the Actiwatch2 (Phillips Respironics), a light-sensing and logging watch worn on the wrist.
Participants wore the device for a 1 week period to monitor environmental light exposure.
The illuminance was measured in lux every minute.
Data were scrubbed of periods where the watch was not worn or other artifacts.
Light levels over 1000 lux were added to determine time outdoors in minutes.
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Baseline
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Baseline iPRGC Activity
Periodo de tiempo: Baseline
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Baseline iPRGC activity (cells in the back of the eye as measured by blue light-driven inputs to the pupil response - measured by the blue decay coefficient).
The Blue Decay Coefficient represents the rate at which the pupil redilates in the dark after exposure to multiple 5-second pulses of red and blue light.
The redilation data are fit by an exponential decay function eβt where t is time in seconds and the coefficient β is the natural log of the percent change in pupil diameter per second.
Values range from -0.30 to -0.01.
More positive values represent slower pupil redilation and are associated with greater, potentially beneficial ipRGC activity.
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Baseline
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Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Accommodative Amplitude
Periodo de tiempo: Baseline
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Testing the hypothesis that long-term soft bifocal contact lens wear does not alter accommodative amplitude.
This hypothesis predicts that at the baseline BLINK2 Study visit, the accommodative amplitude will be similar across the three treatment groups that were randomly assigned at the beginning of the BLINK Study (NCT02255474).
Assessed data from the beginning of the BLINK Study up to the BLINK2 Study Baseline Visit approximately 4.7 years, BLINK2 Study Baseline Visit reported
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Baseline
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Lag of Accommodation
Periodo de tiempo: Baseline
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Testing the hypothesis that long-term soft bifocal contact lens wear does not alter accommodative lag.
This hypothesis predicts that at the baseline BLINK2 Study visit, the accommodative lag will be similar across the three treatment groups that were randomly assigned at the beginning of the BLINK Study (NCT02255474).
Assessed data from the beginning of the BLINK Study up to the BLINK2 Study Baseline Visit approximately 4.7 years, BLINK2 Study Baseline Visit reported.
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Baseline
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Accommodative Facility
Periodo de tiempo: Baseline
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Testing the hypothesis that long-term soft bifocal contact lens wear does not alter accommodative facility.
This hypothesis predicts that at the baseline BLINK2 Study visit, the accommodative lag will be similar across the three treatment groups that were randomly assigned at the beginning of the BLINK Study (NCT02255474).
Assessed data from the beginning of the BLINK Study up to the BLINK2 Study Baseline Visit approximately 4.7 years, BLINK2 Study Baseline Visit reported.
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Baseline
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Slowing of Myopia Progression - Axial Length
Periodo de tiempo: Two year change (Baseline to 2-Year visit)
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Test the hypothesis that wearing +2.50 D multifocal contact lenses slow rather than merely delay myopia progression. This null hypothesis predicts that during the first two years of the BLINK2 Study, when all subjects will wear +2.50 D multifocal contact lenses, axial length elongation at the same rate regardless of original lens assignment (i.e., +2.50 D multifocal lenses, +1.50 D multifocal lenses, SVLs). Alternatively, faster myopia progression in subjects originally fitted with soft bifocal contact lenses compared to single vision contact lenses would indicate a delay in myopia progression rather than a permanent treatment benefit. Measured as the change the baseline BLINK2 visit to the 2 year visit on the IOLMaster which is not the entire time frame of the study - as detailed in the specific aims from the funded grant proposal. Because the exposures before the baseline visit were part of NCT02255474 immediately before this cohort, the original groups were analyzed. |
Two year change (Baseline to 2-Year visit)
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Rebound of Progression - Axial Length
Periodo de tiempo: One year change (2-year visit to 3-year visit)
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The investigators will test the hypothesis that there is no increase in myopia when switching from +2.50 D multifocal contact lenses to single vision contact lenses in Year 2 of the BLINK2 observational study. This hypothesis predicts that the progression of myopia during the last year of follow-up when all subjects will switch to single vision contact lenses, will be similar to myopia progression during the first two years when all subjects wore multifocal contact lenses. Alternatively, faster progression after switching to single vision contact lens wear indicates a "rebound" of myopia progression. This aim was specifically designed to measure what happened between the 2nd and 3rd annual visit which is not the entire time frame of the study - as detailed in the specific aims from the funded grant proposal. Because the entire cohort was wearing the same contact lens, it uses all participants together. |
One year change (2-year visit to 3-year visit)
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Rebound of Progression - Myopia Progression
Periodo de tiempo: One year change (2-year visit to 3-year visit)
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The investigators will test the hypothesis that there is no increase in myopia, as measured by the change in the spherical equivalent, when switching from +2.50 D multifocal contact lenses to single vision contact lenses in Year 2 of the BLINK2 observational study. This hypothesis predicts that the progression of myopia during the last year of follow-up when all subjects will switch to single vision contact lenses, will be similar to myopia progression during the first two years when all subjects wore multifocal contact lenses. Alternatively, faster progression after switching to single vision contact lens wear indicates a "rebound" of myopia progression. This aim was specifically designed to measure what happened between the 2nd and 3rd annual visit which is not the entire time frame of the study - as detailed in the specific aims from the funded grant proposal. Because the entire cohort was wearing the same contact lens, it uses all participants together. |
One year change (2-year visit to 3-year visit)
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Slowing of Myopia Progression - Myopia Progression
Periodo de tiempo: Two year change (Baseline visit to 2-year visit)
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Test the hypothesis that wearing +2.50 D multifocal contact lenses slow rather than merely delay myopia progression. This null hypothesis predicts that during the first two years of the BLINK2 Study, when all subjects will wear +2.50 D multifocal contact lenses, participants will have myopia progression, as measured by spherical equivalent, at the same rate regardless of original lens assignment (i.e., +2.50 D multifocal lenses, +1.50 D multifocal lenses, SVLs). Alternatively, faster myopia progression in those with soft bifocal contact lenses compared to SVLs would indicate a delay in myopia progression rather than a permanent treatment benefit. Measured between Baseline and Year 2 of the BLINK2 Study which is not the entire time frame of the study - as detailed in the specific aims from the funded grant proposal. Because the exposures before the baseline visit were part of NCT02255474 immediately before this cohort, the original groups were analyzed. |
Two year change (Baseline visit to 2-year visit)
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Colaboradores e Investigadores
Patrocinador
Colaboradores
Investigadores
- Investigador principal: Jeffrey J Walline, OD PhD, The Ohio State University College of Optometry
Publicaciones y enlaces útiles
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio (Actual)
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Actual)
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- UG1EY023206 (Subvención/contrato del NIH de EE. UU.)
Información sobre medicamentos y dispositivos, documentos del estudio
Estudia un producto farmacéutico regulado por la FDA de EE. UU.
Estudia un producto de dispositivo regulado por la FDA de EE. UU.
producto fabricado y exportado desde los EE. UU.
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