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Definition
| Front of the eye, first point of entry for light. Can contribute to vision by refraction of light. Degree of curvature contributes to vision and can vary over lifetime. |
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Definition
| Controls the amount of light to reach the retina. Opens and closes to let light into the pupil |
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Definition
| Refracts light by being bent or moving to focus on the retina. Thus involved in focusing |
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Term
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Definition
| Receives projected image and translates image to action potential by interaction with photoreceptors (rods and cones) and visual pigments |
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Definition
| 3rd eyelid in frogs and birds that acts as protective layer |
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Definition
| Reflecting structure in nocturnal animals that lets light pass through the eye a second time. (eyeshine in cats) |
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Term
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Definition
Successfully seeing an object at several distances. (Focusing)
In aquatic verts lens is the only source of refraction (because water equals refract. index of cornea)
In Terrestrial verts: cornea is mainly responsible for image formation with supplemental accom. from lens. |
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Term
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Definition
| Cave like region of high cone concentration near optic axis, better able to discern images here |
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Definition
| Seeing something from far away and knowing exactly where it is. Caused by cones and color reception. |
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Term
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Definition
| Picks up a small slice of light spectrum, allows to see colors |
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Term
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Definition
| Associated with noctural, low light, non-color vision. |
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Term
| Tradeoffs between acuity and sensitivity |
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Definition
Acuity: Cones>Rods in retina
High acuity can detect color and define an image. Detect if something is poisonous and see from far away
Pupils are smaller to increase acuity
Lens flattened to enlarge image.
High Sensitivity: Rods>Cones in retina
Nocturnals are highly sensitive and can see in low light. Better for night dwellers to hunt and flee from hunters.
Tend to have bigger pupils
Eye shape is oblong |
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Term
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Definition
| Low light sight. Big eyes with big pupils and many rods. Identifies motion and general location. |
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Term
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Definition
| Oil droplets, various colored oil droplets affect the spectral composition of light reaching the retina |
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Term
| Binocular verses peripheral vision |
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Definition
Do you want to see a wide field of view or be able to determine exact location?
Prey prefers peripheral, predators binocular |
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