इज़ाफ़ा : 5x optical lens magnification
ऑब्जेक्टिव : To determine refractive error and prescription
वज़न : Approximately 6 kg
मटेरियल : Stainless steel and highgrade optical glass
सटीकता : High precision measurement up to 0.01 diopters
थ्योरी : Optical refraction based assessment