Measuring How Quickly the Eye Focuses After Sustained Viewing of Close-up Images and Videos
6 de julio de 2026 actualizado por: Benjamin Chin, Rochester Institute of Technology
A Randomized, Repeated-measures Study to Measure the Temporal Frequency Response of Ocular Accommodation After Sustained Near Viewing.
In this experiment, subjects will view a cross pattern on the screen and be asked to focus their eyes on it.
The cross pattern will look like it is moving towards and away from the eye in a back-and-forth motion.
As the subjects focus their eyes on the shapes, the investigators will measure the focus of their eyes using a device called a wavefront sensor.
This device uses infrared light to measure the optical properties of the eye in real time.
Our goal is to find out how well the eye focuses before and after viewing images on a screen up close (25cm).
Since many people spend a lot of time looking at a computer screen while at work or at school, it is important to understand how this affects the eye's ability to focus.
Descripción general del estudio
Estado
Reclutamiento
Condiciones
Intervención / Tratamiento
Descripción detallada
In this experiment, subjects will view a Maltese cross pattern on a display through a Badal relay.
Subjects will be instructed to accommodate to the pattern while a focus-adjustable lens optically moves the display closer and farther in depth as a sinusoidal function of time.
As they do so, the investigators will measure the wavefronts of their eyes using a Shack-Hartmann wavefront sensor.
The investigators will measure the gain and phase of the accommodative response of the subjects' eyes.
Measurements will be made before and after sustained viewing of images on a computer screen 25cm away.
Tipo de estudio
Intervencionista
Inscripción (Estimado)
20
Fase
- No aplica
Contactos y Ubicaciones
Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.
Estudio Contacto
- Nombre: Benjamin M Chin, Doctorate
- Número de teléfono: 8454534320
- Correo electrónico: bmccis@rit.edu
Ubicaciones de estudio
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New York
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Rochester, New York, Estados Unidos, 14623
- Reclutamiento
- Chester F. Carlson Center for Imaging Science
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Contacto:
- Benjamin M Chin, Doctorate
- Número de teléfono: 8454534320
- Correo electrónico: bmccis@rit.edu
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-
Criterios de participación
Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.
Criterio de elegibilidad
Edades elegibles para estudiar
- Adulto
Acepta Voluntarios Saludables
Sí
Descripción
Inclusion Criteria:
- Between 18-35 years of age
- Normal or corrected-to-normal (glasses/contact lenses) vision.
Exclusion Criteria:
- Vision worse than 20/20 while wearing glasses / contact lenses.
- Fragile or loose teeth (participants need to bite a piece of dental clay to stabilize their heads so that measurements can be taken from their eyes)
- Current pregnancy (experiment requires sitting down without moving for stretches of time)
- Heart disease
- Personal/familial history of epilepsy
Plan de estudios
Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Ciencia básica
- Asignación: Aleatorizado
- Modelo Intervencionista: Asignación cruzada
- Enmascaramiento: Ninguno (etiqueta abierta)
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
|---|---|
|
Experimental: Near viewing first first
In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks.
One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes.
There are two types of sessions: one in which the screen is viewed first ('near viewing first'), and the other in which the distant object is viewed first ('distant viewing first').
All participants do both sessions.
However, in one arm, participants do the 'near viewing first' session first.
|
In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks.
One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes.
In one intervention, the session is structured such that the screen is viewed first ('near viewing first').
In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks.
One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes.
In one intervention, the session is structured such that the distant object is viewed first ('distant viewing first').
|
|
Experimental: 'Distant viewing first' first
In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks.
One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes.
There are two types of sessions: one in which the screen is viewed first ('near viewing first'), and the other in which the distant object is viewed first ('distant viewing first').
All participants do both sessions.
However, in one arm, participants do the 'distant viewing first' session first.
|
In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks.
One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes.
In one intervention, the session is structured such that the screen is viewed first ('near viewing first').
In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks.
One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes.
In one intervention, the session is structured such that the distant object is viewed first ('distant viewing first').
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Gain and phase of ocular accommodation
Periodo de tiempo: Each measurement takes 10 seconds. In the experiment, the investigators will take measurements over the course of approximately 1 hour.
|
Ocular accommodation is the focusing response of the lens in the eye.
When the stimulus viewed by the participant changes in distance, the eye automatically refocuses.
The investigators measure this refocusing using a device called a wavefront sensor.
The investigators are particularly interested in the gain of accommodation, which is the ratio of the amplitude of accommodation to the amplitude of sinusoidal changes in stimulus distance.
The investigators are also interested in the phase of the accommodative response, which is related to the lag of the accommodative response.
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Each measurement takes 10 seconds. In the experiment, the investigators will take measurements over the course of approximately 1 hour.
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Colaboradores e Investigadores
Aquí es donde encontrará personas y organizaciones involucradas en este estudio.
Patrocinador
Colaboradores
Investigadores
- Investigador principal: Benjamin M Chin, Doctorate, Rochester Institute of Technology
Fechas de registro del estudio
Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.
Fechas importantes del estudio
Inicio del estudio (Estimado)
25 de junio de 2026
Finalización primaria (Estimado)
15 de diciembre de 2026
Finalización del estudio (Estimado)
15 de diciembre de 2026
Fechas de registro del estudio
Enviado por primera vez
25 de junio de 2026
Primero enviado que cumplió con los criterios de control de calidad
25 de junio de 2026
Publicado por primera vez (Actual)
1 de julio de 2026
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
8 de julio de 2026
Última actualización enviada que cumplió con los criterios de control de calidad
6 de julio de 2026
Última verificación
1 de julio de 2026
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- IRB0000131-Exp2
- 4R00EY036497-03 (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.
No
Estudia un producto de dispositivo regulado por la FDA de EE. UU.
No
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