Bifocal reading lens height compensator
Bifocal soft contact lens
Binaural hearing aid
Binaural hearing aid system
Binocular glasses
Binocular lens systems
Binocular optical apparatus in particular electronic...
Binocular viewing device
Binocular visual training device
Bipolar progressive-power ophthalmic lens
Blank for eyeglass lenses and means for selecting a suitable...
Bone conduction audiphone
Bone conduction receiver
Bone conduction unit
Bone-conduction all-in-one transistor amplifier hearing aid
Bone-conduction hearing devices
Bone-conduction hearing-aids
Bridge for attaching auxiliary lenses
Cap provided with removable flip up and down glasses
Cardiographic apparatus with stylus control means