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 automatiserad bedömning av synskärpa hos spädbarn och 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.

Author Spotlight: En automatiserad metod för att bedöma synskärpa hos spädbarn och småbarn med hjälp av ett eyetracking-system  

En automatiserad metod för att bedöma synskärpa hos spädbarn och småbarn med hjälp av ett ögonspårningssystem

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  

Eyetracking-kalibrering för automatiserad synskärpebedömning

Börja med att inhämta informerat samtycke från föräldrarna till barnet som ska testas med ett kalibreringssystem för eyetracking och beskriv studieformatet för dem. Placera barnet som ska testas 55 centimeter från bildskärmen i förälderns knä. Justera lyftbordets position för att placera det med monitorn så att skärmen är vinkelrät mot barnets ögon.Justera webbkamerans position för att säkerställa att barnets ansikte är synligt i inspelningssystemet och för att undvika att fånga andra ansikten än barnets. Innan proceduren påbörjas, informera barnet om att de kommer att titta på skärmen. Instruera föräldern att uppmana barnet att titta på skärmen när barnet inte är uppmärksamt.Öppna sedan den automatiska skärpekortproceduren eller AACP-programvaran och skriv barnets information inklusive namn, kön och ålder i programvaran. Klicka på startknappen för att kalibrera proceduren. Ett grafikutbytesformat eller en GIF-bild visas mot en vit bakgrund i mitten av skärmen i minst tre sekunder.Analyssystemet avgör samtidigt om barnets synfält är fixerat vid bilden genom att visa grön prick på skärmen. Om blickdata inte är tillgängliga inom en minut visar skärmen en annan tecknad GIF-bild. När blickkoordinater identifieras inom detta område startar testproceduren utan testarens åtgärd och körs automatiskt.

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 ...