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Reversible Red/Green or Red/Blue Glasses (ophthalmic quality frame). One size fits all. Ideal for any age. Can be worn over current glasses. Lenses easily reversed.
This ergonomically designed handheld device features 4 peripheral porthole LEDs (Light-Emitting Diodes) and 4 central porthole LEDs with a constant brightness.
The peripheral porthole lights test for peripheral suppression; the central porthole lights test for foveal fusion/suppression.
A momentary rocker switch allows for peripheral or central testing.
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 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.