Non 24 Blindness

Isolation from daily light cycles such as working in an environment completely devoid of natural lighting.

Non 24 blindness.

Most individuals with this disorder are totally blind. The master body clock runs longer than 24 hours a day and is reset every day by environmental light that enters the eyes and strikes photosensitive cells that signal the brain. As a result in the totally blind the internal body clock reverts to a non 24 hour period causing fluctuating periods of good sleep followed by periods of poor sleep and excessive daytime. Difficulty at night and challenges during the day.

Non 24 is a circadian rhythm disorder and occurs because our internal clock is not synched with light and dark cycles of the day and night. Non 24 brings about two significant symptoms. Non 24 is a serious chronic circadian rhythm disorder that s very common in people who are totally blind. Lack of light perception is a key factor in the onset of non 24 which can happen at any age regardless of the cause of blindness.

Where some condition such as blindness or malfunctioning biochemical response to light in the subject prevent normal levels of light activated melatonin. The possible causes of non 24 hour sleep wake disorder are 2 fold. Citation needed and 2 intrinsic. Non 24 is a serious chronic circadian rhythm disorder that s very common in people who are totally blind.

Of the legally blind 130 000 have no light perception i e totally blind and as many as 70 suffer from non 24. Non 24 is common in totally blind people due to the lack of light information received from the eyes which normally regulates the 24 hour day night cycle.