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Upon looking up Phantom Vision, it is a condition called Charles Bonnet Syndrome (CBS). I found a lot of information on it and none that noted a change in seasons increases or decreases the condition. Also, there is no consistent cure but you can look at the question, Is there a cure for CBS? I did find the Charles Bonnet Syndrome Foundation and it is listed below.
I have also listed 4 other sites/articles with a little info on the condition. It is noted to be in about 25% of the cases of Macular Degeneration. Interesting, and an interesting topic for me to talk about with my patients.
Look through the below listed info. It does not look that there is anything that seems to conclusively help it and as is noted below sometimes it can last a year or sometimes can last the rest of a person's life. It is not due to Alzheimers but to the Macular Degeneration.
Is there a cure for CBS?
Presently, there is no universally effective cure for CBS.
Sometimes, improvement in one's vision can bring an end to CBS.
Sometimes, utilisation of visual aids and optimal lighting can reduce symptoms.
Sometimes, behavioural interventions can be effective.
Sometimes, increased socialisation can be beneficial.
Sometimes, certain psychotropic medications can lead to a cessation of CBS symptoms.
However, none of the above interventions have been found to work in the majority of cases.
From the above website:
Charles Bonnet Syndrome, or Visual Hallucinations
About 20% of individuals with vision loss, from any cause, see life-like images from time to time that they know are not really there. This phenomenon is named Charles Bonnet Syndrome (CBS) after the Swiss naturalist and philosopher who first described it in 1760.
The phantom images of Charles Bonnet Syndrome are common, pleasant, everyday things like flowers or animals or people and the experience is somewhat like looking at a picture or watching a silent movie in color. The images are in full color and they may move but there is no sound, smell, or contact. It's important to know that Charles Bonnet Syndrome is related to vision loss, not to loss of mental capacity.
2)Charles Bonnet Syndrome Sufferers See Visions
From the above article:
Charles Bonnet Syndrome might also linger for only a year and then go away, or it might remain with someone indefinitely, as in the case of Zeidman, who has seen images “constantly” for eight years. “It’s actually quite annoying,” says Zeidman, who tends to see buildings, faces, or “little girls running around.”
From the above article:
Some people whose vision has been very poor (from AMD or from other causes) sometimes have visual hallucinations; they see things (objects or patterns) that are not really there. These phantom visions can last from a few seconds to a minute or so and then disappear. Such hallucinations are fairly common and they are not serious, but they are startling. Even so, people who have them generally don't talk about them freely.
The abstract of the above article:
The Charles Bonnet syndrome is a condition in which individuals experience complex visual hallucinations without demonstrable psychopathology or disturbance of normal consciousness. An analysis of the sixty-four cases described in the literature reveals that the syndrome can occur at any age though it is more common in elderly people. Reduction in vision, due to peripheral eye pathology as well as pathology within the brain, is associated with the syndrome. Individual hallucinatory episodes can last from a few seconds to most of the day. Episodes can occur for periods of time ranging from days to years, with the hallucinations changing both in frequency and in complexity during this time. The hallucinations may be triggered or stopped by a number of factors which may exert their effect through a general arousal mechanism. People, animals, buildings, and scenery are reported most often. These images may appear static, moving in the visual field, or animated. Emotional reaction to the hallucinations may be positive or negative. Several theories have been proposed to account for the hallucinations. This paper highlights the sensory deprivation framework, with particular emphasis on the activity in the visual system after sensory loss that produces patterns of nerve impulses that, in turn, give rise to visual experience.