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Peripheral vision problems mean that you don't have a normal, wide-angle field of vision, even though your central vision may be fine. Moderate and severe cases of peripheral vision loss create the sensation of seeing through a narrow tube, a condition commonly referred to as "tunnel vision." Symptoms of peripheral vision loss also can include difficulty seeing in dim light and decreased ability to navigate while you are walking.
http://zulurunner.com/revision-reviews/

Sudden vision loss is vision loss that occurs over a period of a few seconds or minutes to a few days. Vision may become blurry or cloudy, completely absent, or affected by flashing lights or specks in the visual field called floaters. Part of the field of vision or the entire field of vision may be affected. It is helpful to cover one eye and then the other to determine whether one eye or both eyes are affected. Sudden vision loss is most often painless but may be associated with eye pain, redness, and headache.

Loss of vision is considered sudden if it develops within a few minutes to a couple of days. It may affect one or both eyes and all or part of a field of vision. Loss of only a small part of the field of vision (for example, as a result of a small retinal detachment) may seem like blurred vision. Other symptoms, for example eye pain, may occur depending on the cause of vision loss.
https://ipsnews.net/business/2020/09/10/revision-review-the-new-vision-s...

Your brain thrives off these growth factors, according to Jandial, because they help to maintain the health of the 90 billion neurons humans have in our skulls, which ultimately improves the electrical communications between them and therefore brain performance.
https://ipsnews.net/business/2020/09/10/promind-complex-review-shocking-...