Pure Copper cups for Netra Shudhi an ancient yoga practice for eye cleansing. âNetra Shudhiâ has been practised since centuries for its innumerable benefits. Ohria Copper Eye cups are cooling purifying & soothing. Relieves eye strain improves & sharpens eyesight. Rinses out dirt irritants & pollutants Increases blood supply to eyes & optic nerves. Cools eyes ease tension & stress reduces headache. Removes toxins accumulated around eyes through the nasal flow. Helps strengthen optic nerves & muscles.