Home > Blossary: Vision
Vision , visualizing or seeing is an act of eye and brain together. Human being visualize an object in two processes, Vision & Mental. Vision process is done by eye consisting of three abilities of eye ; Acuity , Accommodation & Adaptation. Acuity is the ability of eye to measure accuracy of vision. Acuity lets eye to see detail regulating or controlling lights. The more the light is the better the acuity or vision is. Accommodation is the outcome of muscular functioning of Lens & Iris together to able eye to focus on an object. While, with the ability of Adaption eye adjust itself to different lighting levels. The eye functions over a wide range of light levels and could cope with differences of brightness. Although very high brightness levels may cause blindness due to glare, there will be loss of detail at low light levels. An adjustment from low to high brightness is completed in seconds, but reverse takes minutes. At very high brightness levels there may be some blindness due to glare, and there may be some loss of details at low levels. Eye tends to adjust to the area of highest brightness within the field of view. When a person first enters in to a dark room his or her vision will be poor because of the CONES can't see, but with the RODS taking over the vision will be clearer. Brain does the mental process of visualisation. Brain is the essential part of vision. We can't see anything without brain. Brain, indeed process the data and information fed by eye to let us see or visualise eventually. The region of brain responsible for sight has the area corresponding to the FOVEA and a much smaller area devoted to the PERIPHERY. The images on the RETINA are inverted and transferred left to right and the correction made by the brain. Now, if the brain is upset in any way it makes incorrect interpretations of the data received. Most of the phenomena modify color takes place in brain not in the eye. The way in which we see a surface is largely depend of the intensity and wavelengths of the light it reflects, although nature of the light source may change the appearance of color. We don't have to look at a light source to idea on a an environment, bright or dim, we could idea on same by the appearance of the objects within the field of view. The brain records a image or scene almost simultaneously with actual sighting, but when two lights are flashed together, the one seen by FOVEA appear to flash ahead of what seen by PERIPHERY. The brain is slower in picking up Blue light since eye finds it difficult to focus [ Accommodation ability of eye . Blue lights used in police cars require a lower flashing rate than other colors to let them see clearly.

Category: Science

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Created by: SharfuddinR

Number of Blossarys: 11

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Baksiden av øyet. Netthinnen er direkte koplet å hjernen av nerver som overføre impulser slik at netthinnen er en lys følsom utvidelse av hjernen. Bakdekselet eller netthinnen består av to typer reseptor fotoceller, STENGER & KONER. På grunn av ulike reseptor ser øyet med lik anlegg under vidt forskjellige lys intensiteter. Ikke ser gjøres også effektivt i lys eller moderat skygge. Menneskelige øye kan visualisere ting rundt normalt under ulike forhold av belysning. Et objekt i et rom opplyst av 100 lamper vil variere i utseende svært lite hvis nitti av lampene slått av. netthinnen justerer underetasjen belysning. Det er ikke noe slikt som under eller over eksponering som i tilfelle av et kamera for det menneskelige øyet. Følsomheten på netthinnen endringene under forskjellige lysforhold og det lett kan variere fra time til time og påvirkes av sykdom, tretthet og andre forhold. Kraftig lyd vil redusere røde følsomheten på øyet og øke sensitiviteten av grønne. Samme kan skje med sterke smaker & farger. Foto reseptor cellene i netthinnen er av to typer;STENGER & KJEGLER.

Domain: Life Sciences; Category: Regulatory

眼睛的背面蓋。視網膜與大腦直接相連的神經傳輸一種視網膜是大腦的光敏感擴張的衝動。封底或視網膜的兩種類型的照片受體的儲存格,杆和錐狀細胞組成。因為不同類型的受體,眼睛看到與廣泛不同光照條件下平等基金。看到太有效率是輕或中度的陰影中完成的。人眼可以想像周圍通常在不同的光照條件下的東西。看到在一個房間裡,由 100 燈照亮的物體會有不同的外觀很少如果九十歲的燈關掉。視網膜調整到較低的照明水準。對人的眼睛沒有這種東西或之下或之上和相機的情況下曝光。根據不同光照條件和它的視網膜變化的敏感性可能很容易會發生變化每小時和會受疾病、 疲勞和其他條件。聲巨響將減少紅眼睛的敏感性,並提高綠色的敏感性。同樣的事情可以發生與強大的口味和顏色。

Domain: Life Sciences; Category: Regulatory

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