What Are the Frontal Eye Fields?

English: field of vision. The field of vision refers to the range of space that can be seen by the eye when the head and eyeball are fixed. We call it the static field of vision. What we see when the eye rotates is called the field of vision. To represent. The size and shape of the visual field is related to the distribution of sensory cells on the retina, and the scope of the visual field can be measured with a visual field meter.

"Vision" is also known as "

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Divided into three categories:

Upper-threshold value inspection is a qualitative inspection of the visual field, which is represented by normal, relatively dark spots, or absolute dark spots, respectively. This method is fast but has low reliability and is mainly used for eye disease screening.

Threshold examination is the most accurate quantitative visual field examination. The disadvantage is that each eye is examined for about 15 minutes, and the patient is prone to fatigue.

Fast threshold inspection, such as T () P program, through intelligent trend analysis, reduces the inspection steps, each eye inspection only takes 5min.

automatic

56 ° above, 74 ° below, 65 ° on the nasal side, 91 ° on the temporal side

1. Centripetal visual field reduction is common in retinal pigment degeneration, advanced glaucoma, retrobulbar optic neuritis (peripheral type), and peripheral retinal choroiditis. The narrowing of the visual field, the color field of view is reversed, and the spiral field of view shrinks.

2. Blindness is defined by the gaze point, and half of the defect in the field of vision is called blindness. It is extremely important for the diagnosis of visual pathology.

(1) Ipsilateral hemianopia: It is mostly caused by lesions after cross-ops. Partial, complete, and quadrant ipsilateral hemianopia. Partial ipsilateral hemianopia is the most common, and the defect edge is oblique. Both eyes can be symmetrical or asymmetric. Ipsilateral hemianopia in the upper quadrant is seen in the lesions of the lower lip of the zygomatic lobe or talar lobes; ipsilateral hemianopia in the lower quadrant is caused by fibrous bundles above the optic radiation or upper lip of talar lobes. The ipsilateral hemianopia of the central fixation point is completely bisected, which is called macular schizophrenia, and it is found in the lesions of the posterior visual beam. In the case of blindness, the fixation point is not affected, which is called macular avoidance, and is found in cerebral cortical disorders.

(2) Temporal hemianopia: Caused by cross-optic lesions, ranging in severity from mild visual field defects above the forehead to binocular temporal full eyes.

(3) Fan-shaped visual field defect: The fan-shaped tip is located at the physiological blind spot, which is a central arterial branch embolism or ischemic optic disc disease; The fan-shaped tip is located at the central fixation point as a visual pathology disorder; quadrant blindness: it is anterior lesion of optic radiation. nasal step: early visual field defect in glaucoma.

(4) Dark spots: Central dark spots: located at the central fixation point, common in macular lesions, retrobulbar optic neuritis, toxic, familial optic atrophy. arched dark spots: most of the optic nerve fiber bundle damage, common in glaucoma, myelinated nerve fibers, optic disc congenital defects, optic disc glass sink, and ischemic optic neuropathy; circular dark spots: seen in retinal pigment degeneration, glaucoma. Physiological blind spot enlargement: seen in optic disc edema, optic disc defect, myelinated nerve fibers, and high myopia. ^[1]