Night-blindness was attributed to scurvy by Capt. Cook, even though it failed to clear up like other scorbutic symptoms when the patient got fresh lemons. Baraffield noted in 1814 that fresh meat and vegetables,added to the diet, improved night vision, whereas antiscorbutics did not ; yet he too regarded it as a manifestation of scurvy. The full picture of vitamin A deficiency, as it affects th...

The issues of realistically rendering naturally illuminated scenes at night are examined. This requires accurate models for moonlight, night skylight, and starlight. In addition, several issues in tone reproduction are discussed: eliminatiing high frequency information invisible to scotopic (night vision) observers; representing the flare lines around stars; determining the dominant hue for the...

background: this study compared the sleep quality and sleepiness in day workers and shift workers. sleep quality and sleepiness in staff nurses were significantly different than employees . shift work is an important factor influencing the sleep quality and sleepiness of nurses. the aim of the present research was to compare three groups: (1) nurses with shiftwork; (2) nurses without shiftwork ...

In normal subjects the later part of the cone a-wave to a brief flash increases in amplitude after 50-100 ms darkness due to a contribution from secondary hyperpolarising cells. We recorded these responses along with clinical ON and OFF ERGs in patients with inner retinal dysfunction to see if this part of the a-wave is affected. Patients with autoimmune-like retinopathy and CSNB2 had abnormal ...

the purpose of this study was the effect of time of training and first night of sleep on implicit (accuracy) and motor (timing) components of timed motor sequences task (tmst) enhancement. forty-eight right-handed students (19-25 years old), who have had adequate sleep quality, were divided into three equal groups according to purdue hand and fingers' fine motor skills test and simple reac...

Fear of the dark is a common complaint of pre-teenage children. 2 It should not be confused with night terrors or panics, in which a child becomes acutely agitated and terror-struck at night, appearing to be awake while in fact asleep and unable to be woken. 4 In contrast, fear of the dark can be experienced by the conscious child in dimly lit or dark conditions. When such fear is excessive it ...

In tuberous crops, tuber enlargement is one of the most important target traits for yield formation. It has long been known that growth in yams enhanced by short-day (SD) conditions, but mechanism remains unknown. Here, we analyzed photoperiodic regulation water yam (Dioscorea alata L.). The photoperiod experiments seedlings showed initiated under SD conditions (?10 h daylength) within 20 days ...