The Vision in Preschoolers (VIP) Study, sponsored by the National Eye Institute, initially evaluated 11 vision screening tests in Phase I, including 2 distance visual acuity eye charts – LEA SYMBOLS^® and HOTV. LEA SYMBOLS^® was the only distance visual acuity test to move on to Phase 2. Three other tests in Phase 2 measured refractive error and assessed stereo acuity. The Crowded Single LEA SYMBOLS^® Visual Acuity test for 5 Feet (1.5 meters) was designed exclusively for Phase 2 of VIP.

The VIP Screener Includes

• LEA SYMBOLS^® Crowded Symbols Disk Card with Masking Window for 3-year-olds at 20/50: 1 side for each eye
• LEA SYMBOLS^® Crowded Symbols Disk Card with Masking Window for 4- and 5-year olds at 20/40: 1 side for each eye
• Baseline Flip Book
• LEA SYMBOLS^® Response Key (Lap Card)
• 4 LEA SYMBOLS^® Individual Training Cards
• Cord to measure testing distance
• Recording form and instructions