Manufactures Optical Instr/Lens Manufactures Measure/Control Dvcs Manufactures Process Cntrl Instr Manufactures Machine Tool Access Ophthalmic tonometers or accessories, Ophthalmic transilluminators, Ophthalmic visual field plotters, Ophthalmic visual function analyzers, Ophthalmic visuometers, Ophthalmometers, Ophthalmic instrument tables or accessories