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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The back cover of the eye. Retina is directly connected to the brain by nerves which transmit impulses in such a way that the Retina is a light sensitive expansion of brain. The back cover or retina consisting of two types of photo receptor cells, the RODS & CONES. Because of the different types of receptor, the eye sees with equal facility under widely different light intensities. The seeing is too efficiently done in light or moderate shadow. Human eye can visualise things around normally under different conditions of illumination. An object seen in a room illuminated by 100 lamps will differ in appearance very little if ninety of the lamps switched off. retina adjusts to the lower lighting level. To the human eye there is no such thing as under or over exposure as in case of a camera. The sensitivity of the Retina changes under different light conditions and it may easily vary from hour to hour and be affected by disease, fatigue and other conditions. Loud sound will decrease Red sensitivity of the eye and increase sensitivity of the Green. The same thing can happen with strong tastes & colors. The photo receptor cells of retina are of two types ;RODS & CONES.

Domain: Life Sciences; Category: Regulatory

Silma tagakaas. Võrkkest on otse ühendatud aju närvid, mis edastavad impulsse nii, et võrkkesta on valguse tundlik laienemise aju. Tagakaas või võrkkest koosneb kaht liiki foto retseptori rakke, VARDAD & KÄBID. Eri tüüpi retseptoreid, sest silm näeb võrdset abi, mida laialdaselt erineva valguse intensiivsuse alusel. Kerge või mõõduka varju liiga tõhusalt teha ei näe. Inimese silm saab visualiseerida asju ümber tavaliselt valgustuse erinevates tingimustes. Objekti 100 lampide poolt valgustatud ruumis näha erinevad välimuselt väga vähe kui üheksakümmend lambid välja lülitatud. võrkkesta kohaneb valgustus madalam. Inimsilm on sellist asja nagu alla või üle nagu kaamera puhul. Võrkkesta muutuste alusel erinevates valgustingimustes tundlikkuse võib kergesti varieeruda tund tund ja mõjutada haiguse, väsimuse ja muud tingimused. Valju heli väheneb silma punane tundlikkus ja suurendada tundlikkust roheline. Sama asi võib juhtuda tugevate maitsete & värvid. Foto retseptori rakke Võrkkest on kahte liiki;VARDAD & KÄBID.

Domain: Life Sciences; Category: Regulatory

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