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Method for regulating sighting mark moving speed in dynamic visual acuity testing system

A technology for vision testing and movement speed, which is applied in the fields of eye testing equipment, medical science, diagnosis, etc., and can solve problems such as inconsistency and slow response to visual target movement

Inactive Publication Date: 2016-01-13
PLA NAVY GENERAL HOSIPTAL
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AI Technical Summary

Problems solved by technology

[0003] In the traditional dynamic vision test, the movement speed of the visual target is fixed. Since different tasks require different responses to dynamic targets at different speeds, that is, the subjects’ responses to the visual target movement at different speeds are not consistent. The tester is more sensitive to the movement of the visual target at a certain speed, but reacts slowly to the movement of the visual target at other speeds

Method used

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  • Method for regulating sighting mark moving speed in dynamic visual acuity testing system
  • Method for regulating sighting mark moving speed in dynamic visual acuity testing system

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Embodiment Construction

[0018] Such as figure 2 As shown, the method for adjusting the speed of visual mark movement in this dynamic vision testing system comprises the following steps:

[0019] (1) start;

[0020] (2) Obtain and set the movement speed v of the visual target;

[0021] (3) Obtain the distance d between the subject and the visual target;

[0022] (4) According to the formula (1), the actual moving speed v of the target is obtained 1

[0023] v 1 =v×d / 30(1);

[0024] (5) obtain the single pixel width s of the display screen and the visual mark generation frequency f;

[0025] (6) according to formula (2), obtain the number of pixels u of the adjacent frame visual mark moving on the display screen

[0026] U=v 1 / (s×f)(2);

[0027] (7) END.

[0028] The present invention obtains the actual moving speed v of the visual mark by setting the moving speed v of the visual target and the distance d between the subject and the visual mark 1 , and then obtain the pixel number u of the...

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Abstract

The invention provides a method for regulating the sighting mark moving speed in a dynamic visual acuity testing system. By adopting the method, the sighting mark moving speed can be arbitrarily regulated, and the qualification degree of a driver on a specific task can be truly reflected. The method comprises the following steps: (1) starting; (2) acquiring a sighting mark moving speed v; (3) acquiring the distance d between a tested person and the sighting mark; (4) calculating a sighting mark actual moving speed v1 according to a formula (1); (5) acquiring a single pixel width s and a sighting mark generation frequency f of a display screen; (6) calculating a pixel per inch u of a sighting mark in the adjacent frame moving on the display screen according to a formula (2); and (7) finishing.

Description

technical field [0001] The invention belongs to the technical field of visual acuity detection, and in particular relates to a method for adjusting the movement speed of visual targets in a dynamic visual acuity testing system. Background technique [0002] Dynamic vision refers to the visual resolution of the observer when there is relative motion between the observed object and the observer. The quality of dynamic vision is closely related to the ability to complete tasks in motion. Therefore, dynamic vision detection plays an important role in checking all kinds of drivers and improving the effect of driver training. At the same time, dynamic vision testing is also an important link in the selection of pilots, which plays an important role in improving pilots' flying performance and combat effectiveness. [0003] In the traditional dynamic vision test, the movement speed of the visual target is fixed. Since different tasks require different responses to dynamic targets ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/032
Inventor 李鸣皋徐建中高原韩磊曹利群周必业
Owner PLA NAVY GENERAL HOSIPTAL
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