LEA Numbers 10' Translucent Eye Chart for Goodlite Professional Model
LEA Numbers Translucent Eye Charts are designed to be used with the Goodlite Professional Model and new ESV1018 LED Professional Illuminated Eye Chart Cabinets. These durable 10" x 18" plastic eye charts have proportionally spaced lines and are designed for vision acuity testing at a distance of 10 feet.
LEA Numbers were developed for international studies in occupational health and school health. Tests that use letters, such as Sloan Letters, are used almost exclusively in the western world in former colonies of western empires. Numbers, on the other hand, are used to test visual acuity in most parts of the world. The numbers 5, 6, 8 and 9 are used because they can be designed to blur equally.
LEA Numbers were developed for international studies in occupational health and school health. Tests that use letters, such as Sloan Letters, are used almost exclusively in the western world in former colonies of western empires. Numbers, on the other hand, are used to test visual acuity in most parts of the world. The numbers 5, 6, 8 and 9 are used because they can be designed to blur equally.