JP2010110388A5

JP2010110388A5 -

Info

Publication number: JP2010110388A5
Application number: JP2008283626A
Authority: JP
Filing date: 2008-11-04
Publication date: 2011-12-22
Anticipated expiration: 2028-11-04

Description

（１）
被検者の眼底に測定指標を投影し、眼底からの反射光束を受光素子で受光して被検者眼の屈折力を得る眼屈折力測定手段と、被検者眼に呈示する視標を遠用距離から近用距離まで可変させる視標呈示光学系とを備え、前記視標呈示光学系により雲霧が掛けられる遠用距離に視標を呈示して遠用屈折力を得る眼屈折力測定装置において、
所定の近用距離に視標が呈示された状態での被検者が視標を判読できるか否かを確認するときに前記眼屈折力測定手段により屈折力測定を実行する近用屈折力測定実行手段と、
被検者眼の遠用屈折力と前記近用距離とに基づいて被検者眼が前記近用距離の視標を見るために必要な屈折力を求め、該求めた屈折力と前記近用屈折力測定実行手段により得られた近用の屈折力とを比較し、被検者眼が加入度を必要とするか否か判断してその結果を報知する判断手段と、を備えることを特徴とする。
（２）
（１）の眼屈折力測定装置において、
近用視力測定モードに移行する信号を入力する測定モード移行信号入力手段と、
近用視力測定モードに移行されたときに、前記視標呈示光学系の視標を前記所定の近用距離に切換える制御手段と、を備える。
（３）
（１）〜（２）のいずれかの眼屈折力測定装置において、
前記視標呈示光学系の光路に配置され、被検者眼の乱視屈折力及び球面屈折力を矯正する矯正光学系を備え、
前記制御手段は、近用視力測定モードに移行されたときに、遠用屈折力に基づいて前記矯正光学系を駆動して乱視屈折力誤差及び球面屈折力誤差を矯正する。
（４）
（１）〜（３）のいずれかの眼屈折力測定装置において、前記近用距離の視標を見るために必要な屈折力と前記近用屈折力測定実行手段により得られた近用の屈折力とに基づいて被検者眼に必要な加入度を演算する加入度演算手段と、近用視力測定時に前記矯正光学系に加入度を付加させる指令信号を入力する加入度付加スイッチと、を備え、
前記制御手段は、前記加入度付加スイッチの信号に基づいて前記矯正光学系の駆動を制御し、前記加入度演算手段により演算された加入度分を付加させる。
（５）
（１）〜（４）のいずれかの眼屈折力測定装置において、前記判断手段は、前記比較結果の度数が眼の調節ラグの所定度数を超えている場合に被検者眼が加入度を必要とすると判断することを特徴とする。

(1)
An eye refractive power measuring means for projecting a measurement index onto the fundus of the subject and receiving a reflected light beam from the fundus with a light receiving element to obtain the refractive power of the subject's eye, and a target to be presented to the subject's eye An eye-refractive-index measuring optical system that varies from a distance to a near-distance, and an eye refractive power measurement that obtains a distance power by presenting the target at a distance that is clouded by the target-presenting optical system. In the device
Near power measurement that performs refractive power measurement by the eye refractive power measuring means when checking whether or not the subject can read the visual target in a state where the visual target is presented at a predetermined near distance. Execution means;
Based on the distance refractive power of the subject's eye and the near distance, the subject's eye calculates the refractive power necessary for viewing the target at the near distance, and the calculated refractive power and the near distance Comparing the refractive power for near-use obtained by the refractive power measurement executing means, and determining whether or not the subject's eye needs addition, and notifying the result is provided. And
(2)
In the eye refractive power measurement device of (1),
A measurement mode transition signal input means for inputting a signal for transition to the near vision measurement mode;
Control means for switching the visual target of the visual target presenting optical system to the predetermined near distance when the mode is shifted to the near vision measurement mode.
(3)
In the eye refractive power measurement device according to any one of (1) to (2) ,
A correction optical system that is disposed in the optical path of the target presentation optical system and corrects astigmatism refractive power and spherical refractive power of the subject's eye;
The control means corrects the astigmatic refractive power error and the spherical refractive power error by driving the correction optical system based on the distance refractive power when shifted to the near vision measurement mode.
(4)
In the eye refractive power measurement device according to any one of (1) to (3), the refractive power necessary for viewing the visual target at the near distance and the near refractive power obtained by the near refractive power measurement execution means. Addition power calculating means for calculating the addition power required for the subject's eye based on the force, and an addition power addition switch for inputting a command signal for adding the power to the correction optical system when measuring near vision. Prepared,
The control means controls the driving of the correction optical system based on the signal of the addition power addition switch, and adds the addition power calculated by the addition power calculation means.
(5)
In the eye refractive power measurement device according to any one of (1) to (4) , the determination means determines the addition power of the subject eye when the frequency of the comparison result exceeds a predetermined frequency of the eye adjustment lag. It is judged that it is necessary.

Claims

An eye refractive power measuring means for projecting a measurement index onto the fundus of the subject and receiving a reflected light beam from the fundus with a light receiving element to obtain the refractive power of the subject's eye, and a target to be presented to the subject's eye An eye-refractive-index measuring optical system that varies from a distance to a near-distance, and an eye refractive power measurement that obtains a distance power by presenting the target at a distance that is clouded by the target-presenting optical system. In the device
Near power measurement that performs refractive power measurement by the eye refractive power measuring means when checking whether or not the subject can read the visual target in a state where the visual target is presented at a predetermined near distance. Execution means;
Based on the distance refractive power of the subject's eye and the near distance, the subject's eye calculates the refractive power necessary for viewing the target at the near distance, and the calculated refractive power and the near distance Comparing the refractive power for near-use obtained by the refractive power measurement executing means, and determining whether or not the subject's eye needs addition, and notifying the result is provided. An eye refractive power measuring device.

In the eye refractive power measuring device according to claim 1,
A measurement mode transition signal input means for inputting a signal for transition to the near vision measurement mode;
An eye refractive power measurement apparatus comprising: control means for switching a visual target of the visual target presenting optical system to the predetermined near-distance when shifted to a near visual acuity measurement mode.

In the eye refractive power measuring device according to any one of claims 1 and 2 ,
A correction optical system that is disposed in the optical path of the target presentation optical system and corrects astigmatism refractive power and spherical refractive power of the subject's eye;
The control means corrects the astigmatic refractive power error and the spherical refractive power error by driving the correction optical system based on the distance refractive power when shifted to the near vision measurement mode. Refractometer.

4. The eye refractive power measurement apparatus according to claim 1 , wherein the refractive power necessary for viewing the visual target at the near distance and the near refractive power obtained by the near refractive power measurement execution unit are as follows. An addition power calculating means for calculating the addition power required for the eye of the subject based on the above, and an addition power switch for inputting a command signal for adding the power to the correction optical system when measuring near vision,
The control means controls the driving of the correction optical system based on the signal of the addition power addition switch, and adds the addition power calculated by the addition power calculation means. .

The eye refractive power measurement apparatus according to any one of claims 1 to 4 , wherein the determination means requires that the eye of the subject needs addition when the frequency of the comparison result exceeds a predetermined frequency of the eye adjustment lag. An eye refractive power measuring device, characterized in that it is determined.