【Optical OphThalmic Prism Set】: The triangular prism has 16/22 straight -angle prism composition: 0.5,1,2,4, 6,8,10,12,15,20,25,30,35,40,45,50,(0.5,1,2,3,4,5,6,7,8,9,10,12,14,16,18,20,25,30,35,40,45,50) 【High -quality materials】 Made of high-quality environmentally friendly resin material, safe and healthy, fine workmanship, smooth edges, high -quality aluminum alloy outer box, which is convenient for storage. 【Visual Impairment Application】It can be used for small-degree paralytic strabismus, paralytic strabismus with diplopia or extraocular muscle dysfunction caused by trauma, under- or over-correction after strabismus surgery, or small-degree paralytic strabismus, especially It's cephalic strabismus. 【Flexible configuration options】 The prism bars come in various horizontal and vertical configurations, enabling you to select the best fit for your specific requirements. They are available in different diopter or degree ranges and sizes. 【wide range of applications】The optical test desk is suitable for visual examinations for glasses shops, hospitals, schools, corporate ophthalmology departments.