Worth Four Dot Test
The Worth Four Dot Test helps evaluate color perception by stimulating the red, green and blue cone receptors in the retina. The test set consists of a high-quality, chrome two-cell flashlight, a pair of spectacles with one red lens and one green lens, and complete instructions.
The test set consists of a high-quality, chrome three-cell flashlight with a pair of universal spectacles together with complete instructions.
The flashlights in the test sets require 2 D-cell batteries, which are not included.