About
The Evans Letter Contrast Test (ELCT) chart is the first standardized test for letter contrast. The ELCT chart is designed to be used with either the ESV3000™ or ESC2000™ providing consistent lighting for improved testing results. The ELCT chart presents Sloan Letter, optotypes line size of 20/630 with a testing distance of 1m. The varying contrast in sets of 3 letters of equal contrast level. All triplets are balanced for letter difficulty and differ in contrast by 0.15 log contrast step.
ELCT Chart 1 contains 12 contrast levels ranging from standard 100% acuity to 1.65 log contrast or 2.24% contrast level. Studies show that 1.65 log contrast is the average letter contrast for the normal older population. (Weber Contrast calculation).
ELCT Chart 2 presents 4 contrast levels from 1.8 to 2.25 log contrast.
Set includes both Chart 1 and Chart 2.
Dimensions: Height 24.5" x Width 25.5" (62 cm x 65 cm).
The Evans Letter Contrast Test (ELCT) chart is the first standardized test for letter contrast. The ELCT chart is designed to be used with either the ESV3000™ or ESC2000™ providing consistent lighting for improved testing results. The ELCT chart presents Sloan Letter, optotypes line size of 20/630 with a testing distance of 1m. The varying contrast in sets of 3 letters of equal contrast level. All triplets are balanced for letter difficulty and differ in contrast by 0.15 log contrast step.
ELCT Chart 1 contains 12 contrast levels ranging from standard 100% acuity to 1.65 log contrast or 2.24% contrast level. Studies show that 1.65 log contrast is the average letter contrast for the normal older population. (Weber Contrast calculation).
ELCT Chart 2 presents 4 contrast levels from 1.8 to 2.25 log contrast.
Set includes both Chart 1 and Chart 2.
Dimensions: Height 24.5" x Width 25.5" (62 cm x 65 cm).
Evans Letter Contrast Test (ELCT) fjor ESV3000™ and ESC2000™
- Regular price
- $1,704.95
- Sale price
- $1,704.95
- Regular price
-
$1,704.95
Translation missing: en.products.product.sku:500330
