A focusing device comprises a base unit and a mirror unit which is translatable relative to the base unit parallel to an optical axis of the focusing device. The mirror unit is configured to receive incident light along the optical axis in a first direction and to reflect the incident light parallel with the optical axis in said first direction. The mirror unit comprises at least four mirrors, at least one of the mirrors being curved.

Retinal imaging systems and related methods employ a user specific approach for controlling the reference arm length in an optical coherence tomography (OCT) imaging device. A method includes restraining a user's head relative to an OCT imaging device. A reference arm length adjustment module is controlled to vary a reference arm length to search a user specific range of reference arm lengths to identify a reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user. The user specific range of reference arm lengths covers a smaller range of reference arm lengths than a reference arm length adjustment range of the reference arm length adjustment module.

An objective optical system (43) includes: a reflection surface (RS1) which reflects light traveling toward a sample (SP); a reflection surface (RS2) which reflects light reflected by the reflection surface (RS1) toward the sample (SP); and a transmission portion (TS) which is disposed on an optical path of light reflected by the reflection surface (RS2), which has a liquid contact surface coming into contact with liquid (WT) interposed between the liquid contact surface and the sample (SP), and of which the liquid contact surface is formed to be substantially orthogonal to the optical path of light reflected by the reflection surface (RS2).

Retinal imaging systems and related methods employ a user specific approach for controlling the reference arm length in an optical coherence tomography (OCT) imaging device. A method includes restraining a user's head relative to an OCT imaging device. A reference arm length adjustment module is controlled to vary a reference arm length to search a user specific range of reference arm lengths to identify a reference arm length for which the OCT image detector produces an OCT signal corresponding to the retina of the user. The user specific range of reference arm lengths covers a smaller range of reference arm lengths than a reference arm length adjustment range of the reference arm length adjustment module.

A optical measurement apparatus includes: an optical system which generates a pupil image of a measurement target, using light; a polarization generator which generates a polarized light from the light; a self-interference generator which generates a plurality of beams divided from the pupil image, using the polarized light, and causes the plurality of beams to interfere with each other to generate a self-interference image; and an image analysis unit configured to extract phase data from the self-interference image, and to move the measurement target to a focus position on the basis of the phase data.

Disclosed are several technical approaches of using low coherence interferometry techniques to create an autofocus apparatus for optical microscopy. These approaches allow automatic focusing on thin structures that are positioned closely to reflective surfaces and behind refractive material like a cover slip, and automated adjustment of focus position into the sample region without disturbance from reflection off adjacent surfaces. The measurement offset induced by refraction of material that covers the sample is compensated for. Proposed are techniques of an instrument that allows the automatic interchange of imaging objectives in a low coherence interferometry autofocus system, which is of major interest in combination with TDI (time delay integration) imaging, confocal and two-photon fluorescence microscopy.

The present invention relates to the field of instruments for imaging internal structures of the human body, and in particular of the eye. More specifically it relates to an optimized process and an optical coherence tomography system thereof to measure the distances between the eye interfaces that is, the corneal surfaces, the surfaces of the crystalline lens, the retina and so on. A tiltable selection means, e.g. a titable mirror, is used to switch between different optical sample paths having different lengths, such that information relative to portions of the sample at different depths can be collected.

En face views of OCT volumes provide important and complementing visualizations of the retina and optic nerve head investigating biomarkers of diseases affecting the retina. We demonstrate the combination of real time processing of OCT volumetric data for axial tracking. In combination with a Controllable Optical Element (COE), this invention demonstrates acquisition, real time tracking, automated focus on depth resolved en face layers extracted from a volume, and focus stacked OCT volumes with high resolution throughout an extended depth range.

In a measurement by means of OCT, when dispersion is present in a measured target or an optical system in the vicinity of the measured target, resolution of the measurement is degraded. One spectral interference fringe intensity is acquired when a phase difference between measurement light and reference light is not introduced, two spectral interference fringe intensities are acquired in a time-series manner when a phase difference of π is introduced, a required calculation is performed based on the intensity, and a tomographic image not having reduced resolution due to dispersion is acquired.

An ophthalmologic apparatus measures a dimension of an eye to be examined. The ophthalmologic apparatus includes a light source, an incidence member, an acquisition unit, and a display unit. The incidence member causes light from the light source to be incident on a plurality of different positions in the eye to be examined. The acquisition unit acquires a two-dimensional tomographic image of an interior of the eye to be examined on the basis of a plurality of interference signals acquired as a result of the incidence member causing the incidence of light on the plurality of different positions. The display unit displays the acquired two-dimensional tomographic image.