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- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/10%3A_Geometrical_Optics/10.20%3A_Vision_-_Anatomy_of_the_EyeThe iris, which is visible as the colored part of the eye, is a circular muscular ring lying between the lens and the aqueous humour that regulates the amount of light entering the eye. However, when ...The iris, which is visible as the colored part of the eye, is a circular muscular ring lying between the lens and the aqueous humour that regulates the amount of light entering the eye. However, when looking at a star in the night sky or other object in dim light, the object can be better viewed by the peripheral vision because it is the rods at the edges of the retina, rather than the cones at the center, that operate better in low light.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/10%3A_Geometrical_Optics/10.21%3A_Vision_-_Transduction_of_LightPrimates have full color vision because of the three- cone (trichromatic) system; color is a result of the ratio of activity of the three types of cones. In vertebrates, the main photopigment, rhodops...Primates have full color vision because of the three- cone (trichromatic) system; color is a result of the ratio of activity of the three types of cones. In vertebrates, the main photopigment, rhodopsin, has two main parts: an opsin, which is a membrane protein (in the form of a cluster of α-helices that span the membrane); and retinal, a molecule that absorbs light.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/10%3A_Geometrical_Optics/10.22%3A_Visual_ProcessingThis crossing of optical pathways produces the distinctive optic chiasma (Greek, for “crossing”) found at the base of the brain and allows us to coordinate information from both eyes. When visual sign...This crossing of optical pathways produces the distinctive optic chiasma (Greek, for “crossing”) found at the base of the brain and allows us to coordinate information from both eyes. When visual signals leave the thalamus, they travel to the primary visual cortex at the rear of the brain. Another important visual route is a pathway from the retina to the superior colliculus in the midbrain, where eye movements are coordinated and integrated with auditory information.
