Feature: 1. Completely Filtered: Our worth 4 dot test light's red and green colors are pure, other colors can be completely filtered, and red and green colors are complementary, which can effectively avoid detection deviation. 2. Applicable: Our 4 dot light test kit is used for clinical tests of eye suppression and amblyopia, and it can determine the type of color vision disorder. 3. Test: Our 4 dot light test kit is used for clinical tests of eye suppression and amblyopia, and it can determine the type of color vision disorder and you will be satisfied. 4. Check Color Blindness: The flipper design is simple but very practical to use, helping you test for color blindness and color weakness, with adjustable interpupillary distance. 5. Scenes: Visual function test tool can improve visual clarity and make your eyes more comfortable, suitable for optometry places, optical shops, etc. Specification: Item Type: Worth 4 dot light Material: ABS Battery: Li ion battery 1200mah (built in) Product Function: Wear red and green glasses to observe the worth 4 dot light, and use the aura of complementary colors to separate the 2 eyes, so as to determine whether the 2 eyes have monocular inhibition and fuse vision function under the condition of separation.. Package List: 1 x 4 Dot Test Light1 x Battery Charger1 x Instruction Manual1 x Storage Box1 x Flipper2 x Red Green Lenses