C_S_D 4430 Lecture Notes - Lecture 30: Sensory Neuron, Optic Disc, Ganglion
Document Summary
The eye is designed to be stimulated by light waves and the wavelengths of those light waves are the most important characteristics. Wavelength is defined as the distance a wave travels in one cycle of vibration. Only light with wavelengths between 400-700 nanometers is visible to the human eye. The wavelengths of reflected light determine the colors we see. Light of a single wavelength appear as one of the colors of the rainbow. Light that contains a mixture of wavelengths is seen as white. The absence of reflected light is seen as black. When light waves strike a surface, they can: Refract (pass through and bend in the process) Cornea: translucent curved surface at front of the eye. Ciliary muscle: muscle action makes lens get fatter (with contraction) or flatter (with relaxation) Allows adjustments of focus to different viewing distances. Fovea: the center of the retina and focal point for clear vision.
