Shopping security
The Worth 4-Dot Test can be performed with the help of the red-green torch from Trusetal. The Worth test is used to determine strabismus and the presence of binocular vision.
To perform the test, the patient puts on red-green glasses (not included in the delivery). From a distance of 4 to 5 metres, the lights arranged in a diamond shape are then viewed. The upper light is red, the two middle ones on the right and left are green and the lower one is white. Through the glasses, only the white light can be seen with both eyes, as the red glasses cover the green lights and the green glasses cover the red light.
People with normal vision recognize the lights in the arrangement mentioned above. People with strabismus see 5 lights or double images that appear shifted against each other. If colour vision is severely disturbed with both eyes, the affected person sees the lower white light together with the upper red or the two green lights in the middle.
Ships within 48 hours · Estimated delivery Jun 22 - Jun 27
US$40
Get nowSign up to your membership to get coupons up to
15%
Get nowOpportunity to enjoy order discount up to 15% off
Top-Converting Item to Boost Your Average Order