JP2016093249A5

JP2016093249A5 -

Info

Publication number: JP2016093249A5
Application number: JP2014230052A
Authority: JP
Filing date: 2014-11-12
Publication date: 2017-12-21
Anticipated expiration: 2034-11-12

Description

（１）被検眼の角膜の形状を測定する眼科装置であって、前記被検眼に平行光を投影し、前記角膜上に平行指標像を形成させる平行投影光学系と、前記角膜上に第１拡散指標像を形成させる第１拡散投影光学系と、前記第１拡散指標像とは異なる像高にて第２拡散指標像を形成させる第２拡散投影光学系と、を有する拡散指標投影光学系と、前記平行指標像、前記第１拡散指標像、前記第２拡散指標像を撮像する撮像光学系と、前記撮像光学系によって撮像された指標像に基づいて被検眼の角膜形状を算出する演算手段と、を備え、前記演算手段は、前記平行指標像と前記第１拡散指標像の少なくとも一方の像高による第１の角膜形状と、前記第２拡散指標像の像高による第２の角膜形状とを比較し、比較結果に基づいて前記第２の角膜形状の測定結果を補正することを特徴とする。
（２）被検眼の角膜の形状を測定する眼科装置であって、前記被検眼に平行光を投影し、前記角膜上に平行指標像を形成させる平行投影光学系と、前記角膜上に第１拡散指標像を形成させる第１拡散投影光学系と、を有する拡散指標投影光学系と、前記平行指標像、前記第１拡散指標像を撮像する撮像光学系と、前記撮像光学系によって撮像された前記平行指標像と前記第１拡散指標像の前記第１の経線方向における像高に基づいて被検眼に対する作動距離方向のアライメント状態を検出するアライメント検出手段と、前記撮像光学系によって撮像された指標像に基づいて被検眼の角膜形状を算出する演算手段と、を備え、前記演算手段は、前記第１拡散指標像の前記第１の経線方向における像高による角膜形状と、前記第１拡散指標像の第１の経線方向とは異なる第２の経線方向における像高による角膜形状とを比較し、比較結果に基づいて前記第２の経線方向における被検眼の角膜形状の測定結果を補正することを特徴とする。
（３）被検眼の角膜の形状を測定する眼科装置に用いられる処理プログラムであって、前記眼科装置のプロセッサに実行させることによって、前記被検眼に平行光を投影し、前記角膜上に平行指標像を形成させる平行投影ステップと、前記角膜上に第１拡散指標像を形成させる第１拡散投影ステップと、前記第１拡散指標像とは異なる像高にて第２拡散指標像を形成させる第２拡散投影ステップと、を含む拡散指標投影ステップと、前記平行指標像、前記第１拡散指標像、前記第２拡散指標像を撮像する撮像ステップと、前記撮像ステップにおいて撮像された指標像に基づいて被検眼の角膜形状を算出する演算ステップと、前記平行指標像と前記第１拡散指標像の少なくとも一方の像高による第１の角膜形状と、前記第２拡散指標像の像高による第２の角膜形状とを比較し、比較結果に基づいて前記第２の角膜形状の測定結果を補正する補正ステップと、を前記眼科装置に実行させることを特徴とする。 (1) An ophthalmologic apparatus for measuring the shape of a cornea of an eye to be examined, wherein a parallel projection optical system that projects parallel light onto the eye to be examined and forms a parallel index image on the cornea, and a first on the cornea a first diffusion projection optical system for forming a diffusion index images, the diffusion index projecting optical system having a second diffusion projection optical system for forming a second diffusion index images at different image height from the first diffusion index image An imaging optical system that captures the parallel index image, the first diffusion index image, and the second diffusion index image, and a calculation that calculates a corneal shape of the eye to be inspected based on the index image captured by the imaging optical system Means for calculating the first corneal shape based on the image height of at least one of the parallel index image and the first diffusion index image, and the second cornea based on the image height of the second diffusion index image. The second corneal shape based on the comparison result The measurement result is corrected.
(2) An ophthalmologic apparatus for measuring the shape of the cornea of the eye to be inspected, which projects parallel light onto the eye to be examined and forms a parallel index image on the cornea, and a first on the cornea. a first diffusion projection optical system for forming a diffusion index image, a diffusion index projection optical system with the parallel index image, and an imaging optical system for imaging said first diffusion index image, captured by the imaging optical system Alignment detection means for detecting an alignment state in the working distance direction with respect to the eye based on the image height in the first meridian direction of the parallel index image and the first diffusion index image, and an index imaged by the imaging optical system and a calculating means for calculating a corneal shape of the eye based on the image, the arithmetic means includes a corneal shape due to the image height in the first meridian direction of the first diffusion index image, the first diffusion index The statue's first Comparing a corneal shape with an image height in a second meridian direction different from the first meridian direction, and correcting a measurement result of the corneal shape of the eye in the second meridian direction based on the comparison result To do.
(3) A processing program used in an ophthalmologic apparatus for measuring the shape of the cornea of an eye to be examined, which is executed by a processor of the ophthalmologic apparatus so as to project parallel light onto the eye to be examined, and a parallel index on the cornea A parallel projection step of forming an image, a first diffusion projection step of forming a first diffusion index image on the cornea, and a second diffusion index image having an image height different from the first diffusion index image. A diffusion index projection step including two diffusion projection steps, an imaging step of capturing the parallel index image, the first diffusion index image, and the second diffusion index image, and an index image captured in the imaging step. Calculating the corneal shape of the eye to be examined, the first corneal shape based on the image height of at least one of the parallel index image and the first diffusion index image, and the image height of the second diffusion index image. And a correction step of correcting the measurement result of the second corneal shape based on the comparison result, and causing the ophthalmic apparatus to execute the correction step.

Claims

An ophthalmologic apparatus for measuring the shape of the cornea of an eye to be examined,
A parallel projection optical system that projects parallel light onto the eye to be examined and forms a parallel index image on the cornea;
A first diffusion projection optical system that forms a first diffusion index image on the cornea; and a second diffusion projection optical system that forms a second diffusion index image at an image height different from the first diffusion index image. A diffusion index projection optical system,
An imaging optical system that captures the parallel index image, the first diffusion index image, and the second diffusion index image;
And a calculating means for calculating a corneal shape of the eye based on the index image captured by the imaging optical system,
The computing means compares the first corneal shape based on the image height of at least one of the parallel index image and the first diffusion index image with the second corneal shape based on the image height of the second diffusion index image, An ophthalmologic apparatus, wherein the second corneal shape measurement result is corrected based on a comparison result.

An ophthalmologic apparatus for measuring the shape of the cornea of an eye to be examined,
A parallel projection optical system that projects parallel light onto the eye to be examined and forms a parallel index image on the cornea;
A diffusion index projection optical system comprising: a first diffusion projection optical system that forms a first diffusion index image on the cornea;
An imaging optical system for imaging the parallel index image and the first diffusion index image;
Alignment detecting means for detecting an alignment state in the working distance direction with respect to the eye to be inspected based on an image height in the first meridian direction of the parallel index image and the first diffusion index image captured by the imaging optical system;
Calculating means for calculating the corneal shape of the eye to be examined based on the index image imaged by the imaging optical system,
The computing means is
A corneal shape based on an image height in the first meridian direction of the first diffusion index image and a corneal shape based on an image height in a second meridian direction different from the first meridian direction of the first diffusion index image. An ophthalmologic apparatus that compares and corrects the measurement result of the corneal shape of the eye to be examined in the second meridian direction based on the comparison result.

A processing program used in an ophthalmic apparatus for measuring the shape of the cornea of an eye to be examined,
By causing the processor of the ophthalmic device to execute,
A parallel projection step of projecting parallel light onto the eye to be examined and forming a parallel index image on the cornea;
Diffusion including a first diffusion projection step for forming a first diffusion index image on the cornea and a second diffusion projection step for forming a second diffusion index image at an image height different from the first diffusion index image. An index projection step;
An imaging step of capturing the parallel index image, the first diffusion index image, and the second diffusion index image;
A calculation step of calculating the corneal shape of the eye to be examined based on the index image imaged in the imaging step;
A first corneal shape based on the image height of at least one of the parallel index image and the first diffusion index image is compared with a second corneal shape based on the image height of the second diffusion index image, and based on the comparison result A processing program for causing the ophthalmologic apparatus to execute a correction step of correcting the measurement result of the second corneal shape.