Abstract: An apparatus and a method for measuring blood flow of vessels are provided. The apparatus includes a light source, a light splitting module, a reference arm module, a sample arm module, a probing module, and a control system. The sample arm module includes a scanning unit and an optical-path shifting device. A probe light is obtained from the light splitting module, and a central line of a main light of the probe light extends through a rotation axis of the scanning unit. The probe light is reflected by the scanning unit to the optical-path shifting device. When the optical-path shifting device is rotated between a first position and a second position respectively, the probe light scans a vessel in fundus to obtain a first phase shift signal and a second phase shift signal blood flow rates and total blood flow of all the vessels near an optic disc are determined.

Abstract: An apparatus and a method for evaluating quality of binocular vision of a subject are presented. The apparatus includes a beam source generating a measurement beam which is directed to a first beam splitter; the first beam splitter for generating a first beam which is directed to a first eye, and a second beam which is directed to a second eye; a first optical micro-lens array for receiving a first return beam from the first eye to form a first plurality of light spot images; a first imaging unit for receiving the first plurality of light spot images; a second optical micro-lens array for receiving a second return beam from the second eye to form a second plurality of light spot images; a second imaging unit for receiving the second plurality of light spot images.

Abstract: An apparatus and a method for measuring blood flow of vessels are provided. A light source, a light splitting module, a reference arm module, a sample arm module, a probing module, and a control system are arranged; the sample arm module includes a scanning unit and an optical-path shifting device; a probe light is obtained from the light splitting module, and a main light of the probe light is on a rotating shaft of the scanning unit; the probe light is reflected by the scanning unit to the optical-path shifting device, when the optical-path shifting device is in a first position and in a second position respectively, the probe light scans a vessel in fundus to obtain a first phase shift signal and a second phase shift signal blood flow rates and total blood flow of all the vessels near an optic disc are determined.

Abstract: It is provided a method for quick switching to realize anterior and posterior eye segments imaging, which can realize quick switch and real-time image for locations at different depths. On one hand, with an ability of quick switch, objects at different depths can be measured, and the detection scope of the OCT system can be enhanced; the switch system is able to work stably and change positions accurately without influencing the signal-to-noise ratio of the system. On the other hand, the light beam can be respectively focalized at different locations. Thus, high quality of anterior and posterior eye segments imaging can be achieved with a relatively high lateral resolution for human eyes having different ametropia. Furthermore, based on the anterior and posterior eye segments imaging, an ability of real-time eye axial length measurement can be added.

Abstract: Disclosed are a hand-held vision detecting device and a method for using the hand-held vision detecting device to realize various eyesight measurements without wearing glasses and the steps therefor, wherein the hand-held vision detecting device at least comprises: an imaging lens group consisting of at least one imaging lens and an eye chart. The cornea of the subject can be located at the focal point at one side f the imaging lens group. The center of the eye chart is provided at the other side of the imaging lens group and can move forwards and backwards along the optical path. People can detect vision anytime and anywhere through this device and detection method via simple and easy operations, and the detection results are accurate.

Abstract: It is provided a method for quick switching to realize anterior and posterior eye segments imaging, which can realize quick switch and real-time image for locations at different depths. On one hand, with an ability of quick switch, objects at different depths can be measured, and the detection scope of the OCT system can be enhanced; the switch system is able to work stably and change positions accurately without influencing the signal-to-noise ratio of the system. On the other hand, the light beam can be respectively focalized at different locations. Thus, high quality of anterior and posterior eye segments imaging can be achieved with a relatively high lateral resolution for human eyes having different ametropia. Furthermore, based on the anterior and posterior eye segments imaging, an ability of real-time eye axial length measurement can be added.

Abstract: An ophthalmic optical coherence tomography system and a method for quick switching to realize anterior and posterior eye segments imaging are provided, the system includes: an OCT interferometer primary module and a sample arm module, the OCT interferometer primary module includes an OCT light source, a fiber coupler, a reference arm, a detection module, an X-direction scanning unit, and a Y-direction scanning unit; the sample arm module includes an anterior eye segment imaging module and a posterior eye segment imaging module; the Y-direction scanning unit is rotatable; when the Y-direction scanning unit is at a first rotation angle, the Y-direction scanning unit reflects the light received by the X-direction scanning unit into the anterior eye segment imaging module; when the Y-direction scanning unit is at a second rotation angle, the Y-direction scanning unit reflects the light received by the X-direction scanning unit into the posterior eye segment imaging module.

Abstract: A subjective eye refractometer includes an imaging lens and a target, the front surface of the cornea of a testee is located at a focal point of the imaging lens, the target and an eye of the testee are respectively located on two sides of the imaging lens along an optical axis of the imaging lens, and the target can move forward and backward along the optical axis by means of setting, and the subjective eye refractometer is marked with a value D1 for identifying a spherical refractive-power along a movement path of the target, a movement position x is obtained by subtracting a focal distance f0 from an object distance of the target, when the testee sees the target clearly, the spherical refractive-power of glasses to be worn on the eyes is the corresponding spherical refractive-power D1 at the movement position x of the target. The invention further discloses a subjective refractometry method.

Abstract: It is provided an ophthalmic optical coherence tomography system in the invention, the system comprising: an OCT interferometer primary module and a sample arm module, wherein the OCT interferometer primary module comprises an OCT light source, a fiber coupler, a reference arm, a detection module, an X-direction scanning unit, and a Y-direction scanning unit; the sample arm module comprises an anterior eye segment imaging module and a posterior eye segment imaging module; the Y-direction scanning unit is rotatable; when the Y-direction scanning unit is at a first rotation angle, the Y-direction scanning unit reflects the light received by the X-direction scanning unit into the anterior eye segment imaging module; and when the Y-direction scanning unit is at a second rotation angle, the Y-direction scanning unit reflects the light received by the X-direction scanning unit into the posterior eye segment imaging module.

Abstract: Methods and designs for providing reduced sensitivity to mirror tilt in Fourier transform spectrometers are disclosed. According to an embodiment for two-directional tilt compensation, the FT spectrometer can include a beam splitter positioned to receive an incoming beam from a light source and split the incoming beam into a first sub-beam and a second sub-beam, a corner-cube retroreflector positioned to receive the first sub-beam from the beam splitter, a dual reflective mirror positioned to receive the first sub-beam from the corner-cube retroreflector at one surface and the second sub-beam at the other surface. An optical path delay can be created using a set of mirrors, tilting the beam splitter and/or a glass cube.