old_contents: """Different retinal prosthetic implants, such as Argus II and Alpha-IMS.
  
  .. autosummary::
      : toctree: _api
  
      base
      argus
      alpha
  
  """
  from .base import (DiskElectrode,
                     Electrode,
                     ElectrodeArray,
                     ElectrodeGrid,
                     PointSource,
                     ProsthesisSystem)
  from .argus import ArgusI, ArgusII
  from .alpha import AlphaIMS, AlphaAMS
  
  __all__ = [
      'AlphaAMS',
      'AlphaIMS',
      'ArgusI',
      'ArgusII',
      'DiskElectrode',
      'Electrode',
      'ElectrodeArray',
      'ElectrodeGrid',
      'PointSource',
      'ProsthesisSystem'
  ]
  
new_contents: """Different retinal prosthetic implants, such as Argus II and Alpha-IMS.
  
  .. autosummary::
      : toctree: _api
  
      base
      argus
      alpha
      bva
  
  """
  from .base import (DiskElectrode,
                     Electrode,
                     ElectrodeArray,
                     ElectrodeGrid,
                     PointSource,
                     ProsthesisSystem)
  from .argus import ArgusI, ArgusII
  from .alpha import AlphaIMS, AlphaAMS
  from .bva import BVA24
  
  __all__ = [
      'AlphaAMS',
      'AlphaIMS',
      'ArgusI',
      'ArgusII',
      'BVA24',
      'DiskElectrode',
      'Electrode',
      'ElectrodeArray',
      'ElectrodeGrid',
      'PointSource',
      'ProsthesisSystem'
  ]
  
subject: Add BVA24