well the algae is poison to eye spots
Cuticle is a useful adaptation in plants but not algae because plants need a way to retain water and algae obtains water and other materials directly from the water around them.
Not all echinoderms have eye spots. While many echinoderms, such as starfish and some sea cucumbers, possess simple light-sensitive structures called eye spots, others do not. The presence and complexity of these eye spots can vary widely among different echinoderm species, reflecting their diverse adaptations to marine environments. Overall, eye spots are not a universal feature across all echinoderms.
Yes, some species of sea stars have eye spots at the tips of their arms. These eye spots are simple photoreceptors that can detect changes in light levels and help the sea star navigate its environment.
Photosynthasis
Yes
Yellow spots on the eye are often caused by pingueculas. Pingueculas are noncancerous growths on the cornea and are thought to be caused by UV exposure.
conjunctivitis
Yes, they do
If it is genuine 'black algae' it is very difficult to remove without emptying the pool and gouging the black algae out of the pool surface. Other algae can be removed by shocking the pool, filtering continuously and brushing walls while maintaining a good sanitizer level.
You get more sleep!
The butterfly known for its eye spots on its wings is often referred to as the "owl butterfly," particularly species like the Caligo genus. These eye spots resemble the eyes of larger animals, which can confuse or scare off potential predators. This adaptive mimicry helps enhance their chances of survival in the wild. Other butterfly species, such as the Common Buckeye, also exhibit similar eye spots for predator evasion.
It is laser eye procedure which is useful to correct vision problems.