Baby vision test by Metrovision

Introduction

The purpose of this test is to estimate the visual acuity of children at the non verbal ages.

This test is similar to the preferential looking test: it is based on the baby behavioral response to the presentation of a visual stimulus.
This technique presents several advantages:
• it provides an objective response based on the measurement of eye tracking movements,
• it implies « central » vision,
• it is time effective,
• it can be used at the youngest ages

Visual stimulation

A small grating is presented on the stimulation screen and is made to move at a slow velocity.
Visual acuity is estimated from the highest resolution of the grating that the subject is able to track.
Examples of the tests presented on the stimulator screen and corresponding to different visual acuities are presented hereby.

This test is available on the Moncv3 and MonPackONE systems.

• MonPackONE PDF brochure Information Request MonCV3 PDF brochure

Recording of the eye movement response

The equipment includes an eye tracker that analyzes the image of the baby’s face in real time. A reflective dot positioned over the forehead is used to determine the head movements. Eye gaze movements are measured from the position of the pupils relative to this reflective dot.

Results from normal subjects

Even the youngest babies can follow a moving target provided that they are awake and that the stimulus movement is slow enough.
The results hereby have been obtained at different ages. The movement of the stimulus is indicated in green color whereas the eye tracking movement trace is shown in blue color.

Examples of examination result

This test can also provide information on delayed maturation of the eye movements and document eye movement disorders.