Section 4.2: Other Eyes in the Animal Kingdom (Wesley, 2001)

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Presentation transcript:

Section 4.2: Other Eyes in the Animal Kingdom (Wesley, 2001)

Do Now Check your homework: Check and Reflect #2 (p. 235) Rods, the sensitive photoreceptor cells of the retina, are sensitive to light, but not colour. They will send messages to the brain in dim light while the cones (which detect color) do not. Therefore, in dim light everything appears in shades of grey.

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Differences Between Human and Animal Eyes Fish eyes have a perfectly round lens that bulges out of the pupil, which allows them to detect danger from all directions.

Differences Between Human and Animal Eyes Birds tend to have sharper vision than humans, for birds have 5 different types of cone receptors instead of 3. Birds can see more colors and shades than humans can, which helps them to spot food while in the air.

Differences Between Human and Animal Eyes Nocturnal animals (e.g., cats) are usually awake at night. Their eyes allow them to collect as much light as possible. To capture more dim light they have:  More rods than cones.  Very large pupils.  A layer called the tapetum lucidum, which reflects the low light to the retina. cats/

Video Animal vision

Differences Between Human and Animal Eyes Octopus is an invertebrate with camera eyes, but the lens does not change shape to focus; the lens is moved toward and away from the retina.

Octopus Eyes

Compound Eyes Insects and crustaceans have compound eyes, which are made up of many individual units called ommatidium. These eyes are great for detecting movement, but not for creating a single coherent image.

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