GENERAL HISTOLOGY

Detailed explanation-1: -So how do they see? While it may not look like starfish have eyes, they do, although they’re not like our eyes. A starfish has eyespots that cannot see much in the way of details but can detect light and dark. These eyespots are at the tip of each of the starfish’s arms.

Detailed explanation-2: -Starfish can use eyes at the tips of their arms to find their way home. Most sea-star species have compound eyes on their arms, but there has been no direct evidence that the eyes enable vision.

Detailed explanation-3: -Most starfish possess a crude eye at the tip of each arm. These compound eyes contain multiple lenses called ommatidia, each creating one pixel of the total image the animal sees. Tropical starfish eyes have been shown to be capable of forming crude images, which allow these animals to stay close to their homes.

Detailed explanation-4: -What can be concluded from the available data is that starfish possess a sense of touch, some are able to sense gravity and many display positive rheotaxis, moving up currents. A number of starfish species use olfaction during foraging and prey localization.

Detailed explanation-5: -Starfish eyes are unique, as they use a combination of microvilli and ciliary type photoreceptors. Most derived deuterostomes use ciliary type photoreceptors only, whereas microvilli photoreceptors are typically associated with arthropod eyes.