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Cyanopsia primarily affects the retina, the light-sensitive layer at the back of the eye, and sometimes the optic nerve, which transmits visual signals to the brain. The retina contains specialized cells called photoreceptors, which are responsible for detecting light and color. In cyanopsia, these photoreceptors, particularly the ones ...
[1] [2] [3] Rheum dries and gathers as a crust in the corners of the eyes or the mouth, on the eyelids, or under the nose. [3] It is formed by a combination of mucus (in the case of the eyes, consisting of mucin discharged from the cornea or the conjunctiva), nasal mucus, blood cells, skin cells, or dust. Rheum from the eyes is particularly common.
Xanthopsia is a color vision deficiency in which there is a dominantly yellow bias in vision due to a yellowing of the optical media of the eye. The most common causes are digoxin's inhibitory action on the sodium pump, and the development of cataracts which can cause a yellow filtering effect.
We get into a pattern of waking and sleeping that sees us opening our eyes in the middle of the night. The room is dark, but sure enough, the clock reads the same time as it did the night before ...
The word hypnagogia is sometimes used in a restricted sense to refer to the onset of sleep, and contrasted with hypnopompia, Frederic Myers's term for waking up. [2] However, hypnagogia is also regularly employed in a more general sense that covers both falling asleep and waking up.
Exploding head syndrome (EHS) is an abnormal sensory perception during sleep in which a person experiences auditory hallucinations that are loud and of short duration when falling asleep or waking up. [2] [4] The noise may be frightening, typically occurs only occasionally, and is not a serious health concern. [2]
Try to go to bed and wake up at the same time each day, even on weekends. Try to exercise every day (but not close to bedtime) Get natural sunlight for at least 30 minutes day. Avoid nicotine and ...
According to a study on sleep disturbances in the Journal of Neural Transmission, a hypnic jerk occurs during the non-rapid eye movement sleep cycle and is an "abrupt muscle action flexing movement, generalized or partial and asymmetric, which may cause arousal, with an illusion of falling". [13]