Vision in fish
Vision is an important sensory system for most species of fish. Fish eyes are similar to the eyes of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Birds and mammals (including humans) normally adjust focus by changing the shape of their lens, but fish normally adjust focus by moving the lens closer to or further from the retina. Fish retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision. Some fish can see ultraviolet and some are sensitive to polarised light.
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Vision in fish
Vision is an important sensory system for most species of fish. Fish eyes are similar to the eyes of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Birds and mammals (including humans) normally adjust focus by changing the shape of their lens, but fish normally adjust focus by moving the lens closer to or further from the retina. Fish retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision. Some fish can see ultraviolet and some are sensitive to polarised light.
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Vision is an important sensory ...... uited to the dark environment.
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الرؤية هي جهاز حسي مهم لمعظم أ ...... ها عيون مناسبة للبيئة المظلمة.
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Deepwater fishes often have la ...... etted against the gloom above.
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Left: The barreleye has barrel-shaped, telescopic eyes which are
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Right: The brownsnout spookfish is the only vertebrate known
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The omega iris allows Loricariids to adjust the amount of light that enters their eye.
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diverticulum main eye
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generally directed upwards, but can also be swivelled forward
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retina reflective crystals lens retina
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to employ a mirror eye :
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Vision is an important sensory ...... sensitive to polarised light.
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الرؤية هي جهاز حسي مهم لمعظم أ ...... ية وبعضها حساس للضوء المستقطب.
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Vision in fish
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الرؤية عند الأسماك
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