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An eyespot, often called a stigma (derived from Greek for spot), is a heavily-pigmented organelle located near the cell membrane that seems to function in light reception in â¦ certain single-celled organisms.
Prism eyeglasses have particular lenses used to treat an eye disorder. Just as the convex lenses are used to correct hyperopia or cylindrical lenses to correct astigmatism, so the prism lenses are used to correct an eye condition called phoria. Annoying symptoms that may need prism glasses.