แว่นขยายสวมหัว Optivisor

Model # 1645 | NO. # 3 | Magnfies 13/4 Times | Facal Length 14 inches

Model # 1646 | NO. # 4 | Magnfies 2 Times | Facal Length 10 inches

Model # 1647 | NO. # 5 | Magnfies 2½ Times | Facal Length 8 inches

Model # 1648 | NO. # 7 | Magnfies 2¾ Times | Facal Length 6 inches

Model# 1644 | NO. #10 | Magnfies 3½ Times | Facal Length 4 inches