JP-7856126-B2 - ophthalmological optical equipment

JP7856126B2JP 7856126 B2JP7856126 B2JP 7856126B2JP-7856126-B2

Inventors

西泰史

Assignees

株式会社ニコン

Dates

Publication Date: 20260511
Application Date: 20240718
Priority Date: 20200925

Claims (1)

A scanning member that scans the eye under examination with a light beam from a light source, A light guide optical system that guides the light beam from the light source to the scanning member, An objective optical system that guides the scanning beam from the scanning member to the eye under examination, Equipped with, In the posterior segment imaging state, where the posterior segment of the eye under examination is photographed, The objective optical system focuses the scanning beam from the scanning member , which is positioned at a pupil-conjugate position conjugate to the anterior portion of the eye under examination, onto the posterior portion of the eye under examination. In the anterior segment imaging state, where the anterior segment of the eye under examination is photographed, The light guide optical system changes the focusing position of the light beam from the light source and forms an image conjugate position where the image of the anterior eye is formed between the scanning member and the objective optical system. The objective optical system forms the pupil conjugate position between the anterior portion of the eye under examination and the objective optical system, and focuses the scanning beam from the scanning member onto the anterior portion of the eye under examination, where the working distance, which is the distance between the eye under examination and the objective optical system, is greater than the working distance in the posterior portion imaging state . An ophthalmic optical device in which the scanning direction of the scanning light beam by the scanning member is the same in the posterior segment imaging state and the anterior segment imaging state.

Description

This disclosure relates to ophthalmic optical devices. U.S. Patent No. 7830525 discloses an optical coherence tomography (OCT) system for acquiring tomographic images of the posterior segment of the eye, such as the fundus, by placing a lens attachment between the objective lens and the eye, thereby acquiring tomographic images of the anterior segment, such as the cornea. This OCT system allows for the acquisition of tomographic images of both the posterior and anterior segments of the eye using a single device by utilizing the lens attachment. In the conventional optical coherence tomography (OCT) system described above, the lens attachment is positioned between the eye being examined and the objective lens. Therefore, the subject needs to move for the attachment to be changed in front of their eyes, which is burdensome for the subject and prolongs the examination time. An ophthalmic optical apparatus according to a first aspect of the technology of this disclosure comprises a scanning member that scans the eye under examination with a light beam from a light source, a light guide optical system that guides the light beam from the light source to the scanning member, and an objective optical system that guides the scanning light beam from the scanning member to the eye under examination. In the posterior segment imaging state, where the posterior segment of the eye under examination is imaged, a position conjugate to the scanning member is formed in the anterior segment of the eye under examination, and the scanning light beam from the scanning member is focused on the posterior segment of the eye under examination. In the anterior segment imaging state, where the anterior segment of the eye under examination is imaged, the working distance, which is the distance between the eye under examination and the objective optical system, is greater than the working distance in the posterior segment imaging state, the scanning light beam from the scanning member is focused on the anterior segment of the eye under examination, and the scanning direction of the scanning light beam by the scanning member is the same in the posterior segment imaging state and the anterior segment imaging state. This is a schematic diagram of the ophthalmic optical device of this embodiment.This is an optical path diagram showing the schematic configuration of the imaging optical system used for posterior eye segment observation in this embodiment.This is an optical path diagram showing the schematic configuration of the imaging optical system used for anterior segment observation in this embodiment.This is a schematic optical path diagram showing the state of the optical system centered on the objective lens when observing the posterior segment of the eye.This is a schematic optical path diagram showing the state of the optical system centered on the objective lens when observing the anterior segment of the eye.This is a schematic optical path diagram showing the state of the optical system centered on the objective lens when observing the inside of the eyeball.This is an explanatory diagram for calculating the ray angle at the scanner position located at the pupil conjugate position during anterior segment observation.This is an explanatory diagram for calculating the ray angle at the scanner position located at the pupil conjugate position during internal observation of the eyeball.This is a schematic optical path diagram showing the state of the optical system, centered on the fixation target projection system and objective lens, during posterior segment observation.This is a schematic optical path diagram showing the state of the optical system, centered on the fixation target projection system and objective lens, during anterior segment observation.This flowchart shows an example of processing in the ophthalmic optical device according to this embodiment.This is a lateral view of the optical system configuration related to the alignment of ophthalmic optical devices during posterior segment observation.This is a top-down view of the optical system configuration related to the alignment of ophthalmic optical devices during posterior segment observation.This is a lateral view of the optical system configuration related to the alignment of ophthalmic optical devices during anterior segment observation.This is an optical path diagram, viewed from above, showing the configuration of the optical system related to the alignment of ophthalmic optical devices during anterior segment observation.This is a lateral view of the optical path diagram showing other components of the optical system related to the alignment of ophthalmic optical devices during posterior segment observation.This is a lateral view of the optical system configuration related to the alignment of ophthalmic optical devices during anterior segment observation. The ophthalmic optical device 110 according to the embodiment of this disclosure will be described below with re