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

En automatisert vurdering av synsskarphet hos spedbarn og småbarn

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.

Forfatter Spotlight: En automatisert metode for å vurdere synsskarphet hos spedbarn og småbarn ved hjelp av et øyesporingssystem  

En automatisert metode for å vurdere synsstyrken hos spedbarn og småbarn ved hjelp av et øyesporingssystem

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  

Kalibrering av øyesporing for automatisert vurdering av synsskarphet

Begynn med å innhente informert samtykke fra foreldrene til barnet som skal testes med et øyesporingskalibreringssystem og beskriv studieformatet for dem. Plasser barnet som skal testes 55 centimeter fra displayet på fanget til foreldrene. Juster posisjonen til løftebordet for å plassere det med skjermen slik at skjermen er vinkelrett på barnets øyne.Juster webkameraets posisjon for å sikre at barnets ansikt er synlig i opptakssystemet og for å unngå å fange andre ansikter enn barnets ansikter. Før du starter prosedyren, informer barnet om at de vil se på skjermen. Be forelderen om å be barnet om å se på skjermen når barnet ikke er oppmerksomt.Åpne deretter den automatiserte skarphetskortprosedyren eller AACP-programvaren og skriv inn barnets informasjon, inkludert navn, kjønn og alder, i programvaren. Klikk på startknappen for å kalibrere prosedyren. Et grafikkutvekslingsformat eller GIF-bilde vises mot en hvit bakgrunn midt på skjermen i minst tre sekunder.Analysesystemet bestemmer samtidig om barnets synslinje er fiksert på bildet ved å vise grønn prikk på skjermen. Hvis blikkdataene ikke er tilgjengelige innen et minutt, presenterer skjermen et annet tegneserie-GIF-bilde. Når blikkkoordinater oppdages i denne regionen, starter testprosedyren uten testerens handling og kjøres automatisk.

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 ...