This is a diagnostic, subjective and non-invasive test, with which to detect possible anomalies in our visual field. The device with which this type of test is performed is called automated visual field.
When we look at an object, we look at it clearly and clearly. We are doing this with a very specific area of our retina called a macula. But in addition to the focused object, we are also able to see the other objects surrounding it, even if it is less clear and less focused. We do this with the rest of the retina. All this amount of space that we are able to perceive with our eyes is what we call the visual field. And the one who's responsible for transmitting all this information to our brain is the optic nerve, which is just next to the hand.
It is a fairly common test and is performed frequently in any ophthalmological examination. It is especially indicated in patients with high intraocular pressure, glaucoma sufferers, or have a family background that suffer or have suffered from this disease, as they are more likely to develop it.
Through fieldwork, what you want to detect is those areas of our visual field that have a defective vision. To this end, the patient is placed in front of a device and made to look at a screen that has a cross in the center. Over the approximately two minutes of the exam, lights of different intensity appear around the cross. Every time you see one of these light points, the patient must press a button. This way we can see areas where the patient has a visual deficit. The result is a color map, like the ones we see below, which shows the areas with the patient's best and worst vision.
Therefore, if we have any problem of glaucoma or high intraocular pressure or simply if we want to keep our visual health in good condition, it is advisable to have ophthalmological examinations that include this type of diagnostic tests at least once a year.
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