CN2053089U

CN2053089U - Multipurpose optometry appliance

Info

Publication number: CN2053089U
Application number: CN 89214518
Authority: CN
Inventors: 张建华
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-08-02
Filing date: 1989-08-02
Publication date: 1990-02-21

Abstract

The utility model relates to an optometry appliance which utilizes a laser speckle technique to measure eyes' light bending situations and eyesight situations. After luminous beams generated by a laser are reflected by a total reflecting mirror, are expended by a beam extending mirror, and then are reflected onto a screen by the reflecting mirror. The screen is driven by a synchro motor to obtain a speckle pattern motion. A patient can observe speckle motion situations by a viewing window. A rotary disk can measure out the eye light bending degrees of the patient, and meanwhile an eyesight situation which is straightened can be observed. The utility model has the advantages of simple structure, convenient operation, low cost, high precision, quickly test, etc.

Description

Multipurpose optometry appliance

This utility model is to utilize laser speckle technique to measure the instrument of bent light situation of eye and vision situation.

The normal method that adopts of optometry now is the platycoria optometry, long patient of the method cycle normal study and work in one or two week.The optician's shop often adopts inserted sheet to come optometry, and this method is relevant with the adjusting power of human eye, and the morning of testing out and afternoon are just different.Now state-of-the-art is rafractive.But this instrument is owing to the cost height, and outside being difficult for popularizing, and the optometry error is big, also needs the inserted sheet check to be suitable for after the optometry again.

The long rad work of " laser demonstration experiment " U.S. T, Song Zhufeng translates, People's Education Publishing House's in June, 1980 front page has been introduced the beam of laser that " checking the method and the operation of eyes with laser speckle " its method is sent by laser instrument for the 128th page, after expanding bundle, shine on the diffusing screen, in diffusing screen space in front, will form speckle field.When eye faces toward the left and right motion of diffusing screen, will see also side-to-side movement of speckle.When the speckle movement direction was opposite with the eye motion direction, eyes were myopia, were hypermetropia when the direction of motion is identical, were when not moving and faced.But, can not judge the size of Qu Guangdu number in addition because eye will motion reality not too be used.

The purpose of this utility model is to design and manufacture a kind of simple in structurely, and optometry is accurately rapid, and can demonstrate numerical value immediately, also can judge and correct the easy to operate of back vision situation, and what be easy to popularize uses eye refractometer more.

This utility model is many to be designed shown in figure one with eye refractometer, the laser beam that sends from laser tube (1) after total reflective mirror (3), (4) reflection, shines on the optical screen (8) after beam expanding lens (2) expands bundle again, optical screen is driven by synchronous motor (7), reaches the purpose that makes the laser speckle motion.Human eye maintains static, and can see speckle movement.

The rotating disk (5) that can change lens strength is installed before watch window, as Fig. 2, rotate this garden dish scalable focal power number, make the observer when seeing that speckle does not move, these eyeglass number of degrees are the person's of being verified focal power number, join mirror by this and get final product.

The garden dish (6) that is printed on standard visual acuity chart also is installed novel many of this use on eye refractometer, as Fig. 3, this figure by gauged distance with to dwindle, can see by optometry vision situation having numerical value to show simultaneously by observing the hole, garden.

Owing to use the optometry of this kind method, by optometry person see be speckle motion whether, therefore, very easily observe.But use this instrument rapid test to go out the Qu Guangdu number of patient's eye, compare with computerized optometry, have precision height, optometry conveniently, and advantages such as this apparatus structure is simple, cheap, easy popularization, and this instrumental function is complete, can use for each hospital, optician's shop, school.

Claims

1, a kind of novel multi-use eye refractometer that utilizes laser speckle technique to measure bent light situation of eye and vision situation is characterized in that having adopted the device of optical screen (8) rotation that is driven by synchronous motor (7), and can see the motion of speckle pattern by watch window.

2, by the eye refractometers of using of claim 1 more, it is characterized in that being equipped with in the watch window two rotation garden dishes (5), the border sheet of different focal powers is housed on the dish of garden, rotate this garden dish and can change the eyeglass focal power, and the number of degrees can directly be shown.

3, according to claim 1,2, it is characterized in that standard visual acuity chart is printed on garden dish (6) and goes up the corresponding numeral that has, can see vision numerical value after the rectification by observation port, its visual acuity chart dwindles by standard is proportional.