JP2018023675A5

JP2018023675A5 -

Info

Publication number: JP2018023675A5
Application number: JP2016158675A
Authority: JP
Filing date: 2016-08-12
Publication date: 2019-06-13
Anticipated expiration: 2036-08-12

Claims

Light source,
The light emitted from the light source is divided into measurement light and reference light to be irradiated to the eye through the measurement optical system, and the return light of the measurement light from the eye and the reference light are combined. An information acquisition unit for acquiring information of a tomographic image of the subject's eye based on the interference light obtained by
Optical path length changing means for changing an optical path length difference between the optical path of the measurement light and the optical path of the reference light;
Equipped with
The measurement optical system is
A focusing lens for focusing the measurement light on the eye;
A scanning unit configured to scan the measurement light on the subject's eye;
Imaging region switching means for switching a region of the subject's eye to which the measurement light is irradiated;
Including
When imaging the anterior segment of the subject's eye,
The imaging region switching means is disposed between the eye to be examined and the scanning means such that the exit pupil of the measurement optical system is disposed at a finite distance.
The focusing lens such that the measurement light is focused on the anterior segment when the measurement optical system is disposed at a predetermined working distance with respect to the subject's eye, and the anterior segment enters the imaging range. And said optical path length changing means are respectively disposed at predetermined positions.

The optical tomographic imaging apparatus according to claim 1 , wherein the imaging region switching unit is an adapter lens disposed to face the subject's eye.

The optical tomographic imaging apparatus according to claim 2 , wherein the adapter lens has a dispersion amount equal to the dispersion from the anterior segment to the fundus of the eye to be examined.

The measurement optical system further includes an objective lens,
The optical tomographic imaging apparatus according to any one of claims 1 to 3 , wherein the imaging site switching unit is disposed at a focal position of the objective lens when imaging the anterior eye part.

The optical tomography according to any one of claims 1 to 4 , wherein the imaging site switching means is disposed at a position substantially optically conjugate to the scanning means when imaging the anterior eye part. Imaging device.

Light source,
The light emitted from the light source is divided into measurement light and reference light to be irradiated to the eye through the measurement optical system, and the return light of the measurement light from the eye and the reference light are combined. An information acquisition unit for acquiring information of a tomographic image of the subject's eye based on the interference light obtained by
Optical path length changing means for changing an optical path length difference between the optical path of the measurement light and the optical path of the reference light;
Equipped with
The measurement optical system is
A focusing lens for focusing the measurement light on the eye ;
A scanning unit configured to scan the measurement light on the subject's eye;
Including
When imaging the anterior segment of the subject's eye,
An exit pupil of the measurement optical system is disposed at a finite distance, and
The focusing lens such that the measurement light is focused on the anterior segment when the measurement optical system is disposed at a predetermined working distance with respect to the subject's eye, and the anterior segment enters the imaging range. And said optical path length changing means are respectively disposed at predetermined positions.

The information acquisition unit, at the time of imaging the anterior segment, and controls so as to drive at a predetermined angle range corresponding to the scanning means to the predetermined working distance, any one of claims 1 to 6 The optical tomographic imaging apparatus according to claim 1.

Light source,
The light emitted from the light source is divided into measurement light and reference light to be irradiated to the eye through the measurement optical system, and the return light of the measurement light from the eye and the reference light are combined. An information acquisition unit for acquiring information of a tomographic image of the subject's eye based on the interference light obtained by
Optical path length changing means for changing an optical path length difference between the optical path of the measurement light and the optical path of the reference light;
Equipped with
The measurement optical system is
A focusing lens for focusing the measurement light on the eye;
Scanning means for scanning the measurement light on the eye to be examined,
Including
When imaging the anterior segment of the subject's eye,
An exit pupil of the measurement optical system is disposed at a finite distance, and
The optical path length changing means is disposed at a predetermined position such that the anterior segment enters an imaging range when the measurement optical system is disposed at a predetermined working distance with respect to the eye to be examined.
The optical tomographic imaging apparatus, wherein the information acquisition unit controls the scanning unit to drive in a predetermined angle range corresponding to the predetermined working distance.

The predetermined angular range, based on the predetermined working distance, the scanning means is an angle range defined to scan the measurement light in a predetermined range of the anterior segment, according to claim 7 or 8 The optical tomographic imaging apparatus according to claim 1.

The predetermined working distance, based on said predetermined angular range, said scanning means is the working distance which is determined so as to scan the measurement light in a predetermined range of the anterior segment, according to claim 7 or 8 The optical tomographic imaging apparatus according to claim 1.

The optical tomographic imaging apparatus according to any one of claims 7, 8, and 10, wherein the predetermined angle range is an angle range which the scanning means drives when imaging the fundus of the eye to be examined.

When imaging the anterior segment, the information acquisition unit moves the measurement optical system to a position away from the anterior segment by the predetermined working distance according to the movement of the eye to be examined. The optical tomographic imaging apparatus according to any one of claims 1 to 11 .

The information acquisition unit
The optical path length changing means is disposed such that the anterior eye part is disposed at a predetermined position within the imaging range according to the movement of the subject's eye when imaging the anterior eye part Moving the optical path length changing means from the position of
The optical tomographic imaging apparatus according to any one of claims 7 to 11, wherein the angular range is changed based on the movement of the optical path length changing means.

The information acquisition unit
The optical path length changing means is disposed such that the anterior eye part is disposed at a predetermined position within the imaging range according to the movement of the subject's eye when imaging the anterior eye part Moving the optical path length changing means from the position of
When analyzing a tomographic image generated from the tomographic information, based on the movement of the optical path length changing means, corrects the distance between two points in the tomographic image, any one of claims 1 to 11 The optical tomographic imaging apparatus according to claim 1.

The predetermined position at which the optical path length changing means is disposed is at a predetermined position within the imaging range when the measurement optical system is disposed at a predetermined working distance with respect to the anterior segment. The optical tomographic imaging apparatus according to any one of claims 1 to 14 , wherein the unit is set to be disposed.

The predetermined position where the optical path length changing means is disposed is
Placing a reference reflective object at a position separated from the measurement optical system by the predetermined working distance;
The optical tomographic imaging apparatus according to claim 15 , wherein the optical tomographic imaging apparatus is set to a position that defines the imaging range so that the reference reflective object is disposed at a predetermined position of the imaging range.

The predetermined position where the optical path length changing means is disposed is
The optical path length of one of the measurement light and the reference light when imaging the fundus of the subject eye, and the optical path length of one of the measurement light and the reference light when imaging the anterior segment Find the difference,
Placing a reference reflective object at a position corresponding to the fundus when imaging the fundus;
16. The apparatus according to claim 15 , wherein the reference reflecting object is set to a position offset from the position defining the imaging range so as to be disposed at a predetermined position in the imaging range by the determined optical path length difference. Optical tomography.

The predetermined position where the focusing lens is disposed is
Placing a reference reflective object at a position separated from the measurement optical system by the predetermined working distance;
The light source according to any one of claims 1 to 16 , wherein the measurement light is set at a position where the measurement light is focused on the reference reflective object, based on the luminance of the reference reflective object in the tomographic image generated from the tomographic information. The optical tomographic imaging apparatus described.

The reference reflecting object is a plurality of simulated subject eyes different in diopter,
The predetermined position where the focusing lens is disposed, said plurality of simulated positions the focus determined for each of the eye, the are selected based on the diopter of the eye, to claim 18 The optical tomographic imaging apparatus described.

Provide an alignment reference line in the imaging range,
The measurement optical system is moved with respect to the eye to be examined such that a portion to be imaged of the eye to be examined is disposed at the position of the alignment reference line in the tomographic image of the imaging range generated from the information of the tomographic The optical tomographic imaging apparatus according to any one of claims 1 to 19 .