Hiding Heidi Low Contrast Test for Infants Near/Distance

This low contrast face stimulus is designed for assessment of vision for communication. Developed by Dr. Lea Hyvarinen, this set has 6 contrast levels: 1.25%, 2.5%, 5%, 10%, 25% and 100%. A blank card is included to cover the stimulus before presentation to the subject. The practitioner slides the cover away to reveal “Heidi”. Presenting this stimulus to an infant who does not have normal eye movement (whilst observing the infant’s expression) can give information about the child’s visual sphere. 

Each card measures 23 x 23 cm. The set includes instructions with test protocol guidance.