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

Uma avaliação automatizada da acuidade visual em bebês e crianças pequenas

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 em destaque: um método automatizado para avaliar a acuidade visual em bebês e crianças pequenas usando um sistema de rastreamento ocular  

Um método automatizado para avaliar a acuidade visual em bebês e crianças pequenas usando um sistema de rastreamento 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  

Calibração de rastreamento ocular para avaliação automatizada da acuidade visual

Comece obtendo o consentimento informado dos pais da criança para ser testada com um sistema de calibração de rastreamento ocular e descreva o formato do estudo para eles. Posicione a criança a ser testada a 55 centímetros do monitor no colo dos pais. Ajuste a posição da mesa de elevação para colocá-la com o monitor de modo que a tela fique perpendicular aos olhos da criança.Ajuste a posição da webcam para garantir que o rosto da criança esteja visível no sistema de gravação e para evitar capturar rostos diferentes do da criança. Antes de iniciar o procedimento informe a criança que ela irá assistir à tela. Instrua os pais a solicitar que a criança olhe para a tela quando a criança não estiver prestando atenção.Em seguida, abra o procedimento automatizado do cartão de acuidade ou o software AACP e digite as informações da criança, incluindo nome, sexo e idade, no software. Clique no botão Iniciar para calibrar o procedimento. Um formato de intercâmbio de elementos gráficos ou imagem GIF aparece contra um fundo branco no centro da tela por pelo menos três segundos.O sistema de análise determina simultaneamente se a linha de visão da criança está fixada na imagem, mostrando um ponto verde na tela. Se os dados do olhar não estiverem disponíveis dentro de um minuto, a tela apresentará outra imagem GIF de desenho animado. Quando as coordenadas do olhar são detectadas dentro dessa região, o procedimento de teste é iniciado sem a ação do testador e é executado automaticamente.

Research

JoVE Journal

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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 ...