Qalabka Resict-ka ee dhameystiran ee Propactometer-ka ah Qalabka 'phsthaltter' phsthalMic Qalabka indhaha ayaa ah naqshad cusub, oo loo maro tikniyoolajiyad heer sare ah iyo alaabo tayo sare leh oo cayriin ah, waxqabadka dib-u-habeynta dib-u-helka dhameystiran ee prophar-ka ah ee qalabka kor u kaca. Waxaan ku qumman nahay faahfaahin kasta oo qoraal ah oo ka mid ah dib-u-habeynta guud ee Phoropter-ka ee qalabka 'phioptter' ee 'phioptter' ee 'phistopter' , dammaanad ka qaadda heerka tayada, si loo keeno khibradda wax soo saarka ee kaamil ah. MECANMEM-ga waa mid xirfad-yaqaanno dib-u-habeyn ah oo Shiinaha ah leh oo xirfad