मेदिकेल - बिगियाना गोसा मेगन - नारसिनथाय आरो गाज्रि सोरां थासारिफोर सिङाव फोलावबायथानाय मावनायफोरखौ ग्ल'खमानि गुबै जाहोन सानो ।
Medical science regards severe eye strain and prolonged working under bad lighting conditions as the chief cause of glaucoma .