An ophthalmic imaging system for imaging a retina of a user, the ophthalmic imaging system comprising: an optical coherence tomography,OCT, imaging device including a sample arm optical path, an OCT image detector, a reference arm optical path having a reference arm length, and a reference arm length adjustment module controllable to vary the reference arm length over a reference arm length adjustment range; a housing to which the OCT imaging device is attached; a viewer assembly coupled with the housing, the viewer assembly being configured to engage a user's head to restrain the user's head relative to the housing so that the sample arm optical path extends to the retina of the user; characterized in that it further comprises a control unit operatively connected to the OCT image detector and the reference arm length adjustment module, the control unit being configured to: control the reference arm length adjustment module during an initial imaging of the retina of the user to vary the reference arm length within the reference arm length adjustment range to identify an initial imaging reference arm length (138, 140) for which the OCT image detector produces an OCT signal corresponding to the retina of the user; determine a user specific range of reference arm lengths (134, 136), based on the initial imaging reference arm length (138, 140), that covers a smaller range of reference arm lengths than the reference arm length adjustment range; and control the reference arm length adjustment module during an imaging of the retina of the user subsequent to the initial imaging of the retina of the user to vary the reference arm length to search within the user specific range of reference arm lengths (134, 136) to identify a subsequent imaging reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user. an optical coherence tomography,OCT, imaging device including a sample arm optical path, an OCT image detector, a reference arm optical path having a reference arm length, and a reference arm length adjustment module controllable to vary the reference arm length over a reference arm length adjustment range; a housing to which the OCT imaging device is attached; a viewer assembly coupled with the housing, the viewer assembly being configured to engage a user's head to restrain the user's head relative to the housing so that the sample arm optical path extends to the retina of the user; characterized in that it further comprises a control unit operatively connected to the OCT image detector and the reference arm length adjustment module, the control unit being configured to: control the reference arm length adjustment module during an initial imaging of the retina of the user to vary the reference arm length within the reference arm length adjustment range to identify an initial imaging reference arm length (138, 140) for which the OCT image detector produces an OCT signal corresponding to the retina of the user; determine a user specific range of reference arm lengths (134, 136), based on the initial imaging reference arm length (138, 140), that covers a smaller range of reference arm lengths than the reference arm length adjustment range; and control the reference arm length adjustment module during an imaging of the retina of the user subsequent to the initial imaging of the retina of the user to vary the reference arm length to search within the user specific range of reference arm lengths (134, 136) to identify a subsequent imaging reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user. control the reference arm length adjustment module during an initial imaging of the retina of the user to vary the reference arm length within the reference arm length adjustment range to identify an initial imaging reference arm length (138, 140) for which the OCT image detector produces an OCT signal corresponding to the retina of the user; determine a user specific range of reference arm lengths (134, 136), based on the initial imaging reference arm length (138, 140), that covers a smaller range of reference arm lengths than the reference arm length adjustment range; and control the reference arm length adjustment module during an imaging of the retina of the user subsequent to the initial imaging of the retina of the user to vary the reference arm length to search within the user specific range of reference arm lengths (134, 136) to identify a subsequent imaging reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user.