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 valutazione automatizzata dell'acuità visiva nei neonati e nei bambini piccoli

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.

Autore in primo piano: Un metodo automatizzato per valutare l'acuità visiva nei neonati e nei bambini piccoli utilizzando un sistema di tracciamento oculare  

Un metodo automatizzato per valutare l'acuità visiva nei neonati e nei bambini piccoli utilizzando un sistema di tracciamento oculare

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  

Calibrazione eye-tracking per la valutazione automatica dell'acuità visiva

Inizia ottenendo il consenso informato dai genitori del bambino per essere testato con un sistema di calibrazione del tracciamento oculare e descrivi loro il formato dello studio. Posizionare il bambino da testare a 55 centimetri dal monitor del display in braccio al genitore. Regolare la posizione del tavolo elevatore per posizionarlo con il monitor in modo che lo schermo sia perpendicolare agli occhi del bambino.Regolare la posizione della webcam per assicurarsi che il volto del bambino sia visibile nel sistema di registrazione ed evitare di catturare volti diversi da quelli del bambino. Prima di iniziare la procedura informare il bambino che guarderà lo schermo. Chiedi al genitore di chiedere al bambino di guardare lo schermo quando non presta attenzione.Quindi aprire la procedura automatica della scheda di acuità o il software AACP e digitare le informazioni del bambino, inclusi nome, sesso ed età, nel software. Fare clic sul pulsante di avvio per calibrare la procedura. Un formato di interscambio grafico o un'immagine GIF viene visualizzata su uno sfondo bianco al centro dello schermo per almeno tre secondi.Il sistema di analisi determina simultaneamente se la linea di vista del bambino è fissata sull'immagine mostrando un punto verde sullo schermo. Se i dati dello sguardo non sono disponibili entro un minuto, lo schermo presenta un'altra immagine GIF dei cartoni animati. Quando vengono rilevate le coordinate dello sguardo all'interno di questa regione, la procedura di test inizia senza l'azione del tester e viene eseguita automaticamente.

Research

JoVE Journal

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 ...