Eyesight testing device and method

Abstract

The invention provides an eyesight testing device and method and relates to the field of eyesight testing. The eyesight testing device and method has the advantages that the horizontal distance between a testee and a visual chart can be precisely calculated through an ultrasonic emission device, a first ultrasonic receiver, a second ultrasonic receiver and a central processing unit, and the testeecan be reminded to adjust the distance through the voice of a voice module until the distance meets the requirements of testing standards so as to guarantee the accuracy of the testing result; the height difference between a horizontal plane where the testee is located and the horizontal plane where the visual marks on the 1.0 row are located can be precisely calculated through the ultrasonic emission device, the first ultrasonic receiver, the second ultrasonic receiver and the central processing unit, a controller regulates a stepping motor to drive the visual chart to move upwards and downwards to guarantee the horizontal plane where the testee is located and the horizontal plane where the visual marks on the 1.0 row are located are on the same horizontal plane to meet the requirementsof the testing standards so as to guarantee the accuracy of the testing result; the testing result can be transmitted by the central processing unit to the mobile phone of the testee through Bluetooth, saved into a storage and compared with the subsequent testing results of the testee to judge whether the eyesight changes or not.

Description

technical field [0001] The invention relates to the field of vision testing, in particular to a vision testing device and method. Background technique [0002] With the development of science and technology, more and more multimedia devices are widely used by people, such as smart phones, computers, Internet TVs, etc. While these multimedia devices bring convenience and wonderful life to people, due to the increasing use time Long, its damage to people's eyes is getting bigger and bigger. In order to protect eyesight, people generally need to test the visual acuity value through an eye chart, detect changes in vision, and take protective measures in time. Visual acuity is generally divided into two categories: distance vision and near vision. The distance vision mostly adopts the international standard eye chart. This table is composed of 14 rows of "E" letters with different sizes and opening directions. The measurement ranges from 0.1 to 2.0 and is measured by The eye le...

AI Technical Summary

Problems solved by technology

In the actual test process, the testee blocked one eye with an eye-blocking key. When the tested eye could not see the visual mark clearly, the testee would habitually approach the eye chart, and then continue the test. The tester's eyes are less than 5 meters away from the eye chart horizontally, and the eye level is no longer at the same height as the line of sight at 1.0. At this time, the test value is inaccurate

Moreover, various actions of the testee during the test time will cause the above problems.

[0004] Secondly, after accurately testing the visual acuity value, the tester usually informs the testee of the visual acuity value orally, or broadcasts the visual acuity value by machine voice or prints the report, which is not convenient for the testee to memorize the test value, and it is easy to forget or lose the report after a long time. Compare previous measurements after follow-up measurements to determine if visual acuity has changed

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