What is binocular vision and what is visual function?

Visual function tests include visual psychophysical chain information examination (such as visual acuity, visual field, color vision elimination, dark adaptation, stereo vision and contrast sensitivity) and visual rolling impulse electrophysiological examination.

Visual function refers to the eye's ability to focus on the source of things, gather friends, and blend images. When these functions are very good, there will be no visual fatigue and no myopia. Clear and long-lasting vision can only be achieved if the visual function is normal.

Qingliang Optometry Center specializes in visual function examination and recovery. Improve vision, prevent and control myopia, **amblyopia.

1. Binocular vision function:

aSimultaneous perception (simultaneous vision) refers to the ability of both eyes to receive images at the same time, and the minimum conditions for binocular vision when both eyes can see an object at the same time.

b Fusion image and fusion range refer to the ability of the large fiber mask to see the same part of the same and some different objects seen by the two eyes as a complete object c Stereoscopic vision is a three-dimensional spatial perception, which is a relatively independent eye vision function on the basis of the above-mentioned secondary visual function, and it is the function of the two eyes that can separate the two images and destroy the same image of Hu Ben.

2. Visual function inspection includes two aspects:

1) Visual psychophysical examination: visual acuity, distance visual acuity and near visual acuity;

visual field, central visual field and peripheral visual field;

Color vision, color blindness and FM-100 color vision test;

dark adaptation test;

Contrast sensitivity check.

2) Visual electrophysiological examination: including electrooculography (EOG), electroretinography (ERG), visual evoked potentials (VEP), multifocal electroretinography and multifocal visual evoked potentials.

Visual function represents the ability of our eyes to work together, it is not as intuitive as if there is a problem with vision, and it usually requires the help of some small tools or examinations to find the problem.

The function of vision is to identify foreign objects, determine the orientation of foreign objects, and establish the orientation of one's own external environment. Binocular vision, which is better than monocular vision, not only has the effect of superposition of both eyes, but also reduces the sensory threshold, expands the field of vision, and eliminates the physiological blind spot of the monocular vision. More importantly, it has three-dimensional stereoscopic vision, which makes the subjective visual space more accurately reflect the external actual space, and makes the hand-eye coordination more accurate.

If there is an abnormality in the binocular vision function, there is a problem with the coordination of the two eyes, which will lead to a high degree of myopia in one eye and a low degree in the other eye. Or if one eye is normal and the other eye is squint, then the two eyes will "fight" when they see things, and there will be dysfunction. Therefore, having normal visual function is an important basis for us to see objects clearly.

Some symptoms occur when we have problems with the visual function of one eye, or when we have problems in both eyes at the same time. For example, when looking at things close to something, there is a sense of ghosting, double vision, blurring, the font is flowing and jumping, and the eyes are stretched and nervous.

To put it simply, the left and right eyes can see things alone.