[Ridley's lens and carborundum grinding wheel].
D017554:Carbon Compounds, Inorganic; D006801:Humans; D007908:Lens, Crystalline; D009885:Ophthalmology / Q000295:instrumentation*; D012825:Silicon
D017554:Carbon Compounds, Inorganic; C517455:carborundum; D012825:Silicon
OPHTHALMOLOGY/apparatus and instruments
Lente de Ridley y muela de carborundo.