This examination, often utilized in optometry and ophthalmology, is a binocular vision assessment tool. It presents dissimilar images to each eye independently, employing red filters over one eye and green filters over the other. The patient views a target with four dots: typically, one red, two green, and one white. The subjective perception reported by the patient reveals the status of their binocularity.
The procedure is important because it helps diagnose and assess conditions such as suppression, diplopia (double vision), and fusion abilities. It provides a rapid and non-invasive method to screen for binocular vision anomalies, particularly in children. Historically, this assessment has been a valuable component of comprehensive eye examinations, aiding in early detection and management of binocular vision disorders.