The Vision In Preschoolers (VIP) Study, sponsored by the National Eye Institute, initially evaluated 11 vision screening tests and found that LEA Symbols were among the 4 most effective tests for young children. VIP's Crowded Single LEA Symbols Visual Acuity Test for 5 feet (1.5 meter), designed exclusively for the study.
The VIP Package includes:
- VIP Illuminator with Universal Power Supply
- Crowded LEA Symbols Disk Card with Masking Window for 3-year-olds: 1 side for each eye
- Crowded LEA Symbols Disk Card with Masking Window for 4- and 5-year olds: 1 side for each eye
- Baseline Flip Book
- LEA Symbols Response Key (Lap Card)
- 4 LEA Symbols Individual Training Cards
- PASS Test II Stereo Acuity Test
- Children's Fun Frame occluders
- Cord to measure testing distance
- Recording form and instructions
- Universal Power Supply