Name: Eye-Tracking Calibration for Automated Visual Acuity Assessment
Uploaded: 2023-03-17T13:30:00
Description: Watch this Scientific Journal Video about Eye-Tracking Calibration for Automated Visual Acuity Assessment at JoVE.com

The video outlines a procedure for testing a child's eye tracking using a calibration system. It details obtaining parental consent, positioning the child correctly, ensuring visibility for the webcam, and utilizing software to analyze the child's gaze focus on displayed images, initiating the test automatically once detected.

eye-tracking calibration for automated visual acuity assessment

Una evaluación automatizada de la agudeza visual en bebés y niños pequeños

The infantile period is a critical period for visual development. Visual problems that arise early in life can have a significant impact on a child&#39;s development. It is important to be able to perform a quantitative visual assessment in infants, which can help detect early vision problems. However, because infants are not cognitively developed or expressive enough to recognize visual acuity chart symbols, such as letters or graphs, measuring their visual acuity is difficult. The current gold standard for infant vision assessment is the acuity card procedure1 based on the preferential looking test2. However, because this method requires experienced testers to judge visual acuity by observing the child&#39;s eye movements3,4,5,6, it is limited by the experience of the testers4,5. Therefore, acuity card procedures, such as Teller Acuity Cards (TACs)5,6, remain a subjective method. Thus, there is a need for a method that can quantitatively measure visual acuity in infants and young children, that can be used without the need for verbal communication and that is not limited by requiring experienced testers.
The invention and use of the remote eye tracker enabled an automated acuity measuring system to be developed. In previous studies, eye-tracking methods have been used as a tool for visual function evaluation in children7,8,9,10. A remote eye tracker can be used for gaze tracking and is a substitute for a tester&#39;s observation of a child&#39;s eye movements. The ACTIVE procedure7 and AVAT procedure10 are fully automated visual acuity tests with a remote eye tracker; they have yielded comparable visual acuity results to the Keeler Acuity Cards test in healthy infants and young children. As opposed to other recent studies, we used a webcam instead of a remote eye tracker to capture the child&#39;s gaze. We invented an eye movement data automatic acquisition method based on computer vision. The procedure combined the eye movement acquisition method with the preferential looking technique in assessing visual function in children.
This paper aims to present a novel automated method, which can evaluate visual acuity in young children, called the automated acuity card procedure (AACP). This procedure is particularly useful for infants and younger children who have not yet acquired sufficient communication skills. The key aspect is that visual responses can be quantitated to yield grating acuity in infants and young children. Grating acuity measurement enables the detection of visual pathologies and plays an important role in subsequent medical management.

Autor destacado: Un método automatizado para evaluar la agudeza visual en bebés y niños pequeños utilizando un sistema de seguimiento ocular  

Un método automatizado para evaluar la agudeza visual en bebés y niños pequeños utilizando un sistema de seguimiento ocular

This novel automated method called the Automated Acuity Card Procedure, or AACP, can evaluate visual acuity in young children. The procedure is useful for infancy and the younger children who have not yet acquired sufficient communication skills. The AACP procedure uses a webcam instead of a remote eye-tracker.A two-choice preferential-looking test automatically recognizes the child's watching behaviors. When the child watch the visual stimuli on a digital display screen, cartoon images are presented in the center of the screen as visual rewards during the testing procedure. It reduces the misstatement of the procedure caused by the infant's eye gets shifting to the side In the future, by changing the types of visual stimulation, the AACP may be used to evaluate other visual information processing functions early in children's development.

Watch this Scientific Journal Video about Eye-Tracking Calibration for Automated Visual Acuity Assessment at JoVE.com

Eye-Tracking Calibration for Automated Visual Acuity Assessment  

Calibración de seguimiento ocular para la evaluación automatizada de la agudeza visual

Comience por obtener el consentimiento informado de los padres del niño para ser examinado con un sistema de calibración de seguimiento ocular y describa el formato del estudio para ellos. Coloque al niño que va a ser examinado a 55 centímetros del monitor de la pantalla en el regazo de los padres. Ajusta la posición de la mesa elevadora para colocarla con el monitor de forma que la pantalla quede perpendicular a los ojos del niño.Ajuste la posición de la cámara web para asegurarse de que la cara del niño sea visible en el sistema de grabación y para evitar capturar caras que no sean las del niño. Antes de comenzar el procedimiento, informe al niño que mirará la pantalla. Indique a los padres que le pidan al niño que mire la pantalla cuando el niño no esté prestando atención.Luego abra el procedimiento automatizado de tarjeta de agudeza o el software AACP y escriba la información del niño, incluido el nombre, el sexo y la edad, en el software. Haga clic en el botón de inicio para calibrar el procedimiento. Un formato de intercambio de gráficos o una imagen GIF aparece sobre un fondo blanco en el centro de la pantalla durante al menos tres segundos.El sistema de análisis determina simultáneamente si la línea de visión del niño está fijada en la imagen mostrando el punto verde en la pantalla. Si los datos de la mirada no están disponibles en un minuto, la pantalla presenta otra imagen GIF de dibujos animados. Cuando se detectan coordenadas de mirada dentro de esta región, el procedimiento de prueba se inicia sin la acción del probador y se ejecuta automáticamente.

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Behavior

Eye-Tracking Calibration for Automated Visual Acuity Assessment

An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Visual acuity measurement is an important visual function test to perform in infancy and childhood. However, accurate visual acuity measurement in infants ...