Lens set with metal ring

266 pcs best trial lens set price JS-266 with metal ring The trial lens sets is suitable for examining refractive errors, such as myopia, hyperopia, astigmatism, persbyopia; Also for examination of strabismus and color blindness. It is essential for ophthalmological protection departments in hospitals, the health care departments in factories, schools and country areas, the refraction rooms in glasses shops, and for physical examination of soldiers and farmers