The purpose of the Feed is to listen to apparatus waiting for incoming data and then transfer it to a artefact data server. It consist three different modules:

• A deamon running main module which can be configured to receive data from one or more apparatus through a driver, obtain patient information through pidio and transfer the information to an artefact server.
• A driver module implementing apparatus specific communication flow and control.
• A library offering shared functionality between the drivers.

The software are supposed to be light weighted, flexible and easy configurable so that for example a thin client easily can be configured to communicate with one or more specific apparatus. Furthermore all the running clients should be easily monitored from a central point, so that failure on a client running Feed can be handled from a central point.

Besides what is described above Feed also includes discovering and documenting the protocol of communication of the various apparatus.

• Centralize root fs and config files.

• Error handling and logging when communicating with artefact.

• Only median values when there exist more than one measurement.
• Only handling DKM (autorefraction) data.

• Use sph_f in cycloplegisk refraction.
• Currently only support for sphere, cyl and axis in cycloplegic refraction.