#A253500 Hiding Heidi

consists of low contrast "Heidi" faces of decreasing contrast levels used to determine the lowest level of contrast at which the baby or multihandicapped person responds. While playing with the baby introduce HIDING HEIDI low contrast cards to assess face to face visual contact, the most important mode of communication during baby's 1st yr. Set has 4 cards with contrast levels: 1.25%, 2.5%, 5%, 10%, 25% & 100% and a blank card. Place the blank card over a "Heidi" face and simultaneously move each card out to the sides, utilizing a"preferential looking" technique. Record response distance & contrast level. Measures 9" x 9".

LEA Numbers Low Contrast Translucent Chart

This low contrast chart was designed to be used in The Model A Cabinet for Translucent Charts offering proper test lighting conditions. Low contrast charts can ONLY be used in the cabinet. Use it with the 100% contrast chart (#A271200) and you can compare Snellen findings for 100% and 2.5% contrast levels. The 2.5% level of contrast is similar to the levels of contrast found in our daily environment.

• A271900 — 25% Contrast Level
• A271800 — 10% Contrast Level
• A271700 — 5% Contrast Level
• A271600 — 2.5% Contrast Level
• A271500 — 1.25% Contrast Level

#A251100 LEA Symbol Low Contrast Flip Chart

The contrast levels of the test lines on five pages are: 25%, 10%, 5%, 2.5% and 1.2%. The LEA Symbols are the 9.5M size at 1 meter corresponds to visual acuity 20/200 (6/60, 0.1), at 2 meters to 20/100 (6/30. 0.2) at 4 meters 20/50 (6/15, 0.3. There is one line of Symbols at each contrast level per card. All cards are bound in a spiral flip chart for ease of presentation

#A270400 LEA Number Low Contrast Flip Chart

The contrast levels of the test lines on five pages are: 25%, 10%, 5%, 2.5% and 1.2%. The LEA Numbers are the 9.5M size at 1 meter corresponds to visual acuity 20/200 (6/60, 0.1), at 2 meters to 20/100 (6/30. 0.2) at 4 meters 20/50 (6/15, 0.3. There is one line of Numbers at each contrast level per card. All cards are bound in a spiral flip chart for ease of presentation.