BIOL 102 Lecture Notes - Lecture 19: Vitreous Body, Ciliary Muscle, Aqueous Humour
Document Summary
Cornea: transparent, fixed lens (cannot change the focus) Shape of cornea may change through time. Sclerotics: bones in the eye to keep the shape of the eye in the eye (some vertebrates) Iris: pupil (hole in the center can change shape) controls amount of light. Ciliary body: between the cornea and the iris. Vitreous humor: thick, viscous fluid; between retina and iris, helps focus. Protein: crystalline (change through time problems with eyesight) Focus: changes shape (muscles attached make lens thicker or thinner: refract light in different ways: spherical lens in fishes moves back and forth instead of changing shape, ciliary muscle: Accommodation: ability of lens to change shape for focusing. Pigments: chemicals have a color change when they get hit by a wavelength of light. Retinal (made of vitamin a beta keratin - carrots: rhodopsin in rods: specialized for black and white vision (nocturnal animals/deep sea fishes only have this, photopsins in cones: specialized for color vision.
