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FEATURES
• Top-grade quality View Tester
• Elegant design of butterfly-shape appearance
• Oust-proof design
• Sphere power reading use control knob design.
• High grade plated-film used in all optic lenses
• This device is applicable to ophthalmology department of hospitals and spectacle stores for precision measurement of visual functions such as myopia, hyperopia , astigmatism, eyesight balance, heterophoria , stereoscopic vision and eyesight amalgamation