chart projectors, refractors, cornea examination instruments, [ ophthalmotonometers, ophthalmoscopes, ophthalmic testers, audiometers, hearing aids, artificial teeth, dental implants, lasers for medical purposes, surgical laser knives, intraocular lenses, and fiber scopes, all for medical purposes ]

'aid':13 'artifici':14 'audiomet':11 'chart':1 'cornea':4 'dental':16 'examin':5 'fiber':28 'hear':12 'implant':17 'instrument':6 'intraocular':25 'knive':24 'laser':18,23 'lens':26 'medic':20,32 'ophthalm':9 'ophthalmoscop':8 'ophthalmotonomet':7 'projector':2 'purpos':21,33 'refractor':3 'scope':29 'surgic':22 'teeth':15 'tester':10

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