Search

CN-110072430-B - Ophthalmic device

CN110072430BCN 110072430 BCN110072430 BCN 110072430BCN-110072430-B

Abstract

The invention provides an ophthalmic device comprising a light source (82; 84) arranged to emit a fixed target light, and a reflective surface (68A) arranged to reflect scanning light emitted by an emission segment, the emission segment being a source of scanning light different from the light source, and to scan the scanning light in a specific direction by changing the orientation. The ophthalmic device further comprises a concave mirror (70A) arranged such that, when the subject's eye (38) is brought to the focal point of the concave mirror during use of the ophthalmic device, the scanning light reflected by the reflecting surface (68A) is incident on the subject's fundus, and arranged such that, when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device and when the light source (82; 84) emits a fixation target light, the fixation target light and the scanning light are simultaneously incident on the fundus via different light paths, both propagating via the concave mirror (70A) and the focal point, the fixation target light following a predetermined light path for fixing the gaze of the subject's eye (38).

Inventors

  • MUYO GONZALO
  • ALISTAIR GORMAN
  • SHI TIANCHENG

Assignees

  • 奥普托斯股份有限公司
  • 株式会社尼康

Dates

Publication Date
20260508
Application Date
20171010
Priority Date
20161011

Claims (20)

  1. 1. An ophthalmic device comprising: A light source (82; 84;120; 122) configured to emit a fixed target light; A reflective surface (68A) configured to reflect the fixed target light and further configured to reflect scanning light emitted by an emission segment and scan the scanning light in a particular direction by changing orientation, wherein the emission segment is a source other than the light source (82; 84;120; 122) and is a source of the scanning light, and the fixed target light and the scanning light are incident on the reflective surface (68A) through different light paths; A concave mirror surface (70A) arranged such that, when an eye (38) of a subject is brought to a focal point of the concave mirror (70) during use of the ophthalmic apparatus, the scanning light reflected by the reflecting surface (68A) is incident on a fundus of the eye (38) of the subject, The ophthalmic device is configured such that when the subject's eye (38) is brought at the focal point of the concave mirror (70) during use of the ophthalmic device and when the light source (82; 84) emits the fixation target light, the fixation target light and the scanning light are simultaneously incident on the fundus via different light paths, both of which propagate via the reflecting surface (68A), the concave mirror (70A) and the focal point, the fixation target light traveling along a predetermined light path for fixing the gaze of the subject's eye (38); A controller (13; 74) configured to control emission of the fixation target light by the light source (82; 84;120; 122), by controlling the light source (82; 84;120; 122) to emit the fixation target light only when the reflecting surface (68A) is oriented in a predetermined orientation, when the reflecting surface (68A) scans the scanning light, such that the fixation target light travels along the predetermined light path for fixing a gaze of an eye (38) of the subject, and At least one further light source arranged such that when the subject's eye (38) is brought at the focal point of the concave mirror (70) during use of the ophthalmic device and when each of the at least one further light source emits the fixation target light, the respective fixation target light and the scanning light are simultaneously incident on the fundus via different light paths, Wherein the different light paths all travel via the concave mirror (70A) and the focal point, the light paths of the respective fixed target lights do not pass through the reflecting surface (68A), or the different light paths all travel via the reflecting surface (68A), the concave mirror (70A) and the focal point; Wherein the controller (13; 74) is further configured to select a light source from the light sources and to control emission of the fixation target light by the selected light source based on information indicating at least one of an orientation of the reflective surface (68A), a range of orientations of the reflective surface (68A), and a speed of change of the orientation of the reflective surface (68A) such that the fixation target light emitted by the selected light source travels along a predetermined light path for fixation of gaze of an eye (38) of the subject.
  2. 2. The ophthalmic device of claim 1, configured such that when the subject's eye (38) is brought at the focal point of the concave mirror (70) during use of the ophthalmic device and when the light source (82; 84;120; 122) emits a fixed target light, the respective fixed target light and the scanning light are simultaneously incident on different locations of the fundus via different light paths, both of which travel via the concave mirror (70A) and the focal point.
  3. 3. The ophthalmic apparatus according to claim 1, wherein the fixed target light and the scanning light are incident on the reflecting surface (68A) at different incident angles, and the concave mirror (70) is an ellipsoidal mirror.
  4. 4. The ophthalmic device of any one of claims 1-3, wherein the predetermined orientation is adjustable so as to change a position on the fundus to which the fixation target light is emitted.
  5. 5. An ophthalmic device according to any one of claims 1-3, further comprising a second reflective surface (182A), the second reflective surface (182A) being arranged at a first position separate from the optical path of the scanning light in case the scanning light is emitted onto a peripheral region of the fundus, and being configured to reflect fixation target light onto the fundus via the concave mirror (70A) along the predetermined optical path when the subject's eye (38) is brought at the focal point of the concave mirror (70) during use of the ophthalmic device.
  6. 6. The ophthalmic device of claim 4, further comprising a second reflective surface (182A), the second reflective surface (182A) being arranged at a first position separate from an optical path of the scanning light in case the scanning light is emitted onto a peripheral region of the fundus, and configured to reflect a fixation target light onto the fundus via the concave mirror (70A) along the predetermined optical path when the subject's eye (38) is brought into focus at the concave mirror (70) during use of the ophthalmic device.
  7. 7. The ophthalmic device of claim 5, wherein the second reflective surface (182A) is movable between the first position and a second position, the second position being separated from an optical path of the scanning light if the scanning light is emitted onto a central region of the fundus, the ophthalmic device further comprising: A moving mechanism (181) configured to move the second reflecting surface (182A) between the first position and the second position, and A controller (74) configured to control the movement mechanism (181) and to control the light source (180; 232) configured to emit the fixed target light reflected from the second reflecting surface (182A), such that the second reflecting surface (182A) is arranged at the first position and the light source (180; 232) is illuminated if the orientation of the reflecting surface (68A) is an orientation such that the scanning light is emitted onto the peripheral region, and such that the second reflecting surface (182A) is arranged at the second position if the orientation of the reflecting surface (68A) is an orientation such that the scanning light is emitted onto the central region.
  8. 8. The ophthalmic device of claim 6, wherein the second reflective surface (182A) is movable between the first position and a second position, the second position being separated from an optical path of the scanning light if the scanning light is emitted onto a central region of the fundus, the ophthalmic device further comprising: A moving mechanism (181) configured to move the second reflecting surface (182A) between the first position and the second position, and A controller (74) configured to control the movement mechanism (181) and to control the light source (180; 232) configured to emit the fixed target light reflected from the second reflecting surface (182A), such that the second reflecting surface (182A) is arranged at the first position and the light source (180; 232) is illuminated if the orientation of the reflecting surface (68A) is an orientation such that the scanning light is emitted onto the peripheral region, and such that the second reflecting surface (182A) is arranged at the second position if the orientation of the reflecting surface (68A) is an orientation such that the scanning light is emitted onto the central region.
  9. 9. The ophthalmic device of claim 7 or 8, wherein the controller (74) is configured to select a light source of the light sources (82; 84;120; 122) based on information indicating at least one of the orientation, a range of orientations of the reflective surface (68A), and a speed of change of the orientation of the reflective surface (68A), to control emission of the fixation target light by the selected light source (82; 84;120; 122), and to control positioning of the second reflective surface (182A) by the movement mechanism (181) such that the fixation target light emitted by the selected light source travels along a predetermined optical path for fixation of a gaze of the subject's eye (38).
  10. 10. An ophthalmic device according to any one of claims 1-3, further comprising a second light source (232), the second light source (232) being arranged at a first position separate from the optical path of the scanning light in case the scanning light is emitted onto a peripheral region of the fundus, and being configured to emit fixation target light onto the fundus via the concave mirror (70A) along a predetermined optical path when the subject's eye (38) is brought at the focal point of the concave mirror (70) during use of the ophthalmic device.
  11. 11. The ophthalmic device of claim 4, further comprising a second light source (232), the second light source (232) being arranged at a first position separate from an optical path of the scanning light in case the scanning light is emitted onto a peripheral region of the fundus, and being configured to emit a fixation target light onto the fundus via the concave mirror (70A) along a predetermined optical path when the subject's eye (38) is brought into focus of the concave mirror (70) during use of the ophthalmic device.
  12. 12. The ophthalmic device of claim 10, wherein the second light source (232) is movable between the first position and a second position, the second position being separated from an optical path of the scanning light if the scanning light is emitted onto a central region of the fundus, and the ophthalmic device further comprising: A movement mechanism (184) configured to move the second light source (232) between the first position and the second position, and A controller (74) configured to control the movement mechanism (184) and the emission of fixed target light by the second light source (232) such that the second light source (232) is arranged at the first position and is illuminated if the orientation of the reflective surface (68A) is such that the scanning light is emitted onto the peripheral region, and such that the second light source (232) is arranged at the second position if the orientation of the reflective surface (68A) is such that the scanning light is emitted onto the central region.
  13. 13. The ophthalmic device of claim 11, wherein the second light source (232) is movable between the first position and a second position, the second position being separated from an optical path of the scanning light if the scanning light is emitted onto a central region of the fundus, and the ophthalmic device further comprising: A movement mechanism (184) configured to move the second light source (232) between the first position and the second position, and A controller (74) configured to control the movement mechanism (184) and the emission of fixed target light by the second light source (232) such that the second light source (232) is arranged at the first position and is illuminated if the orientation of the reflective surface (68A) is such that the scanning light is emitted onto the peripheral region, and such that the second light source (232) is arranged at the second position if the orientation of the reflective surface (68A) is such that the scanning light is emitted onto the central region.
  14. 14. The ophthalmic device of claim 12 or 13, wherein the controller (74) is configured to select a light source of the light sources (82; 84;120; 122) based on information indicating at least one of the orientation, a range of orientations of the reflective surface (68A), and a speed of change of the orientation of the reflective surface (68A), to control emission of the fixed target light by the selected light source, and to control positioning of the second light source (232) by the moving mechanism (184) such that the fixed target light emitted by the selected light source travels along a predetermined optical path for fixing gaze of the eye (38) of the subject.
  15. 15. The ophthalmic device of any one of claims 1 to 3, 6 to 8, and 11 to 13, configured such that when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device, the light source is configured to emit the fixation target light such that the fixation target light incident on the fundus is perceived by the subject as continuously lit.
  16. 16. The ophthalmic device of claim 4, configured such that when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device, the light source is configured to emit the fixation target light such that the fixation target light incident on the fundus is perceived by the subject as continuously lit.
  17. 17. The ophthalmic device of claim 5, configured such that when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device, the light source is configured to emit the fixation target light such that the fixation target light incident on the fundus is perceived by the subject as continuously lit.
  18. 18. The ophthalmic device of claim 9, configured such that when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device, the light source is configured to emit the fixation target light such that the fixation target light incident on the fundus is perceived by the subject as continuously lit.
  19. 19. The ophthalmic device of claim 10, configured such that when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device, the light source is configured to emit the fixation target light such that the fixation target light incident on the fundus is perceived by the subject as continuously lit.
  20. 20. The ophthalmic device of claim 14, configured such that when the subject's eye (38) is brought to the focal point of the concave mirror (70) during use of the ophthalmic device, the light source is configured to emit the fixation target light such that the fixation target light incident on the fundus is perceived by the subject as continuously lit.

Description

Ophthalmic device Technical Field The technology of the present disclosure relates to an ophthalmic device. Background For convenience of explanation, hereinafter, optical coherence tomography is referred to as "OCT" and scanning laser ophthalmoscopy is referred to as "SLO". Patent document 1 describes a fundus inspection apparatus provided with an OCT unit that generates an image using OCT. In the OCT unit described by patent document 1, a tomographic image, which is an image taken in the thickness direction of a film of the fundus of the subject, is generated based on an image signal detected by a Charge Coupled Device (CCD). A Liquid Crystal Display (LCD) is housed in the fundus inspection apparatus of patent document 1, and in the case where the fundus is imaged by the OCT unit, the LCD displays a fixation target to fix the gaze of the subject's eye in a specific orientation. Light from the LCD is incident on the subject's eye through an optical system including a lens and a mirror, so that a fixed target is projected onto the fundus of the subject's eye. Related documents Related patent document Patent document 1 Japanese patent application laid-open No.2008-289579 Summary of The Invention The present invention provides an ophthalmic apparatus including a light source configured to emit a fixed target light, and a reflection surface configured to reflect a scanning light emitted by an emission segment, which is a source of the scanning light different from the light source, and scan the scanning light in a specific direction by changing a direction. The ophthalmic apparatus further includes a concave mirror surface arranged such that, when the subject's eye is brought to the focal point of the concave mirror during use of the ophthalmic apparatus, the scanning light reflected by the reflecting surface is incident on the fundus of the subject, and configured such that, when the subject's eye is brought to the focal point of the concave mirror during use of the ophthalmic apparatus and when the light source emits the fixation target light, the fixation target light and the scanning light are simultaneously incident on the fundus via different optical paths both propagating through the concave mirror surface and the focal point, the fixation target light advancing along a predetermined optical path for fixing the gaze of the subject's eye. The ophthalmic device according to one embodiment may be configured such that when the subject's eye is brought at the focal point of the concave mirror during use of the ophthalmic device and when the light source emits the fixation target light, the fixation target light and the scanning light are simultaneously incident on the fundus via different light paths that both pass via the reflecting surface, the concave mirror surface and the focal point, the ophthalmic device further comprising a controller configured to control emission of the fixation target light by the light source such that the fixation target light follows a predetermined light path for fixing the gaze of the subject's eye. The ophthalmic device according to the above-described embodiments may further comprise at least one further light source arranged such that when the subject's eye is brought at the focal point of the concave mirror during use of the ophthalmic device and when each of the at least one further light source emits a fixed target light, the respective fixed target light and the scanning light are simultaneously incident on the fundus via different light paths both advancing via the concave mirror and the focal point, the light path of the respective fixed target light does not pass via the reflective surface. The controller may be configured to select one of the light sources and control emission of the fixation target light by the selected light source based on information indicating at least one of an orientation of the reflecting surface, an orientation range of the reflecting surface, and a speed of change of the orientation of the reflecting surface, such that the fixation target light emitted by the selected light source follows a predetermined optical path for fixing gaze of eyes of the subject. The ophthalmic device according to the above-described embodiments may optionally further comprise at least one further light source configured such that when the subject's eye is brought at the focal point of the concave mirror during use of the ophthalmic device and when each of the at least one further light source emits a fixed target light, the respective fixed target light and scanning light are simultaneously incident on the fundus via different light paths both advancing via the reflective surface, the concave mirror and the focal point. The controller may be configured to select a light source from the light sources based on information indicating one of an orientation at the reflecting surface, an orientation range of the reflecting surface, and a speed of change of the orient