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Did you know how a visual field test reveals the secrets of the eye?
In our daily lives, eyes play a vital role. Not only do they help us see the world around us, they also influence our behavior and decisions without even realizing it. Yet, how much do we know about how our eyes work? Visual field testing, a common examination in ophthalmology and neurology, reveals many important secrets about our vision.
Visual field of view is "the range of space that can be seen at the same time while looking steadily in a certain direction."
Basic concept of field of view
Visual vision can be regarded as a concept that combines structure and perception. In ophthalmology and neurology, visual field is often referred to as the "range of functional capacity", and this range can be measured by various methods, especially through peripheral vision testing (perimetry). Physiologically, the normal human monocular visual field ranges from 60 degrees to 107 degrees, covering a wide range of our visual experience.
How to perform a visual field test
The measurement of visual field mainly uses the peripheral vision test method. This test is particularly important in detecting patients with visual field defects. There are many testing methods, including dynamic and static testing. Dynamic testing displays a light spot on the white interior of a hemisphere, and the light spot slowly moves to the center until the subject can see it. The static test fixes the light spot and flashes it at different intensities to observe the extent to which the subject can perceive the light spot.
Common visual field testing instruments include Humphrey visual field analyzer, Optopol, Octopus, etc.
Causes of visual field loss
Loss of visual field can be caused by a variety of eye diseases or neuropathy. Take glaucoma as an example. This type of disease causes peripheral visual field defects, while macular degeneration affects central visual field. Lesions of nerve pathways can also cause certain types of visual impairment, in which visual field defects vary depending on the location of the injury.
The main categories of visual field defects include retinopathy, optic nerve lesions and visual pathway lesions.
Glaucoma and visual field loss
Glaucoma is a visual field loss disease caused by damage to the retinal nerve fiber layer. Visible visual field changes often occur in early-stage glaucoma patients, with key changes concentrated in the central visual field. When looking for visual field loss in glaucoma, common patterns doctors look for include suppression of the overall visual field, as well as specific blind spots.
Visual field defects caused by macular degeneration
In macular degeneration, the central area of the retina is affected, resulting in the loss of the middle field of vision, which has profound consequences for daily life. The ability to read text and recognize faces is impaired.
The impact of visual pathway lesions
The structure of the visual pathway carries visual information from the retina to the brain, and any damage can lead to different types of visual field defects. For example, when the optic nerve is damaged on one side, it will cause partial or complete loss of the visual field on that side, while bilateral damage may cause bilateral hemianopia.
Methods for detecting visual field defects
There are a variety of methods for detecting visual field defects, including screening for retinopathy, various vision tests, and assessment of local brain function. Doctors will make personalized assessments and recommendations for patients based on different test results.
Performing visual field testing can better understand the patient's visual abilities and limitations, and then formulate corresponding treatment plans.
Clinical significance of visual field testing
Visual field testing not only provides important information for disease diagnosis, but also reflects the patient's quality of life and impact on daily activities. Through regular check-ups, doctors can detect potential vision problems earlier.
With the advancement of science and technology, the accuracy and convenience of visual field testing continue to improve, and it is expected to better help humans reveal the secrets of the eyes in the future. Are you ready to discover the interesting world that opens your eyes?
