Diagnostic Tool for Various Types of Refractive Errors and Occult Strabismus (7 in 1). The concept: This is a kit consisting of two plastic parts (the first part is a measuring ruler, and the second part is a rotating circular wheel holding four different function discs) joined by metal rivets, according to the measurements shown in the attached documents. This is a new and improved version of Industrial Model 1097, dated July 7, 2019. The previous kit consisted of a 5-in-1 design, as shown in the model below. University of Al-Mustaqbal – The First and Leading Private University