HLTH1030 Lecture 5: HLTH1030-Lecture 5
7 Nov 2018
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Document Summary
70% of all sensory receptors in the body are in the eyes. Half of cerebral cortex involved in processing visual information. Accessory structures protect the eye and aid eye function. Tough connective tissue coat over majority of outside of eye. Supplies nutrients and oxygen mainly to lens and cornea & retina. Contributes to intraocular pressure -> structure of eye. Holds neural layer of retina firmly against pigmented layer. Eye anatomy - vascular pigmented middle layer: choroid. Iris regulates amount of light entering eye by adjusting diameter of pupil. Colored part of eye that lies between cornea and lens, continuous with ciliary body regulates amount of light entering eye by adjusting diameter of pupil. Not in humans but in many vertebrates. Reflects light e. g. increases ability to see in dim light in cats 44% When light shines into the eye of an animal having a tapetum lucidum, the pupil appears to glow. Where light from centre of visual field strikes retina.
