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Vision tester

A tester and vision technology, applied in the field of visual tester, can solve problems such as cheating and small workload of medical staff, and achieve the effect of reducing the display accuracy and reducing the volume

Active Publication Date: 2014-06-25
WENZHOU RAYMOND PHOTOELECTRICITY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are still some other defects in these traditional vision testing equipment at present. The disadvantages are: 1. The visual targets and their arrangement in the vision chart are fixed. Note down its arrangement, there is a possibility of cheating; 2. It is necessary for the medical staff to use the indicator stick to point the optotype, and the examinee will feed back the direction of the opening of the optotype to the medical staff, and then the medical staff will compare and judge , and finally get the visual acuity value of the examinee, which brings a lot of workload to the medical staff

Method used

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specific Embodiment 1

[0010] Specific embodiment 1: as figure 1 As shown, the vision tester includes a housing and a data processing device 1 , a display device 2 and an optical system arranged in the housing. The shell is provided with a peep hole 3, and the data processing device 1 can be a microprocessing system or an embedded system composed of a single-chip microcomputer as the core and its memory and other peripheral components. In this specific embodiment, the data processing device 1 selects a single-chip microcomputer and other peripherals. A micro-processing system composed of components, the memory is equipped with an optotype library, and according to needs, one or more of the national standard optotype library, the recruiting optotype library, the children's optotype library and the contrast sensitivity optotype library can be set inside the memory kind. The display device 2 selects an LCD (liquid crystal display) display and is connected to the data output terminal of the data proces...

specific Embodiment 2

[0011] Specific embodiment 2: as figure 2 As shown, in order to increase the function of the vision tester and adapt to different detection items, such as common vision inspection and stereoscopic vision inspection, the vision tester is preferably provided with a lens converter 6, which is provided with multiple different types of The detection lens 5 (such as positive lens, negative lens, red-green filter, cylindrical mirror, etc.), the lens converter 6 includes a multi-mirror mounting bracket 601 and a bracket driving device 602. In this specific embodiment, the multi-mirror lens The mounting bracket 601 is composed of a disk-shaped lens mounting plate, and the lens mounting plate is uniformly provided with a plurality of lens mounting holes along concentric circles, and various lenses are arranged in the lens mounting holes, and the lens mounting plate is aligned with the optical axis. Vertical arrangement, the concentric circles intersect the optical axis, the center of t...

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Abstract

The invention relates to a medical instrument for the ophthalmology department, in particular to a vision tester. The vision tester comprises a data processing device, a display device and an optical system. A sighting mark library is arranged in the data processing device. The display device is connected with the data processing device. The data processing device extracts sighting marks from the sighting mark library and sends the sighting marks onto the display device for displaying. The optical system comprises a detection lens and one or more refraction elements. The refraction elements are arranged in a light path between the detection lens and the display device and used for carrying out multiple reflections on the light path to enable the light path to have multiple sections of turning portions. The optical axis of the detection lens is perpendicular to the display surface of the display device after being reflected by the refraction elements. According to the vision tester, the multiple refraction elements are arranged to carry out multiple reflections on the light path, so the light path is lengthened in a limited space; consequently, the requirement for the display accuracy of a liquid crystal display is reduced, the size of the vision tester is reduced, and the miniaturization of the vision tester becomes possible.

Description

technical field [0001] The invention relates to an ophthalmic medical instrument, in particular to a visual tester. Background technique [0002] Visual function examination is one of the most basic examination items in health examination and clinical ophthalmology. The traditional inspection method is mainly eye chart inspection. [0003] The most traditional and common vision testing equipment are light box vision charts, vision projectors, and comprehensive refractometers. The visual targets of these vision charts are composed of black and white, that is, high-contrast graphics. Research has proved that this special Contrast optotype checks the visual function, and the results can only reflect the visual function of the human eye under specific conditions (looking at high-contrast objects). However, in most cases, the human eye sees things in various contrast environments, so it is necessary to check the visual function of the human eye under various contrast conditions...

Claims

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Application Information

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IPC IPC(8): A61B3/032A61B3/06A61B3/08
Inventor 金霓海金成鹏张力伟
Owner WENZHOU RAYMOND PHOTOELECTRICITY TECH
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