Accueil > 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.

Catégorie : Science

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Created by: SharfuddinR

Number of Blossarys: 11

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La couverture arrière de le œil. Rétine est directement relié au cerveau par les nerfs qui transmettent les impulsions de telle sorte que la rétine est une légère expansion sensible du cerveau. La façade arrière ou la rétine, composée de deux types de cellules réceptrices de photo, les tiges et les cônes. En raison des différents types de récepteurs, le œil perçoit avec une facilité égale sous différentes intensités lumineuses. Celui qui voit se fait trop efficacement dans l'ombre légère ou modérée. Oeil humain peut visualiser des choses autour normalement sous différentes conditions d'éclairage. L'objet vu dans une pièce éclairée par des 100 lampes différera en apparence très peu si 90 ans des feux éteint. rétine s'ajuste sur le plus faible niveau d'éclairement. Pour l'oeil humain il n'y a aucune telle chose comme sous ou surexposition comme dans le cas d'un appareil photo. La sensibilité des changements rétine sous différentes conditions de lumière et il peut facilement varier d'heure en heure et être touchée par la maladie, de fatigue et d'autres conditions. Son fort diminueront rouge sensibilité de le œil et augmenter la sensibilité du vert. La même chose peut arriver avec des couleurs et des goûts forts.

Domain: Life Sciences; Catégorie: Regulatory

Il coperchio posteriore dell'occhio. Retina è direttamente collegato al cervello di nervi che trasmettono gli impulsi in modo tale che la Retina è una luce sensibile espansione del cervello. La cover posteriore o retina costituito da due tipi di cellule del ricevitore di foto, le canne & coni. A causa di diversi tipi di recettore, l'occhio vede con eguale facilità sotto ampiamente differenti intensità luminose. Il visto è fatto troppo efficiente in ombra leggera o moderata. L'occhio umano può visualizzare cose intorno normalmente in diverse condizioni di illuminazione. Un oggetto visto in una stanza illuminata da 100 lampade differirà in apparenza molto poco se novant'anni delle lampade spente. retina regola il livello di illuminazione più bassa. Per l'occhio umano non non c'è nessuna cosa come sotto o sopra esposizione come nel caso di una macchina fotografica. La sensibilità dei cambiamenti Retina sotto diverse condizioni di luce e si può facilmente variare di ora in ora ed essere colpita dalla malattia, affaticamento e altre condizioni. Suono forte farà diminuire la sensibilità rosso dell'occhio e aumentare la sensibilità del verde. La stessa cosa può accadere con gusti forti & colori. Le cellule del ricevitore di foto della retina sono di due tipi;ASTE & CONI.

Domain: Life Sciences; Catégorie: Regulatory

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