BIOL 2410 Lecture Notes - Lecture 12: Amacrine Cell, Retinal Pigment Epithelium, Ganglion Cell
15 Nov 2016
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Accommodation reflex diminishes from age 10 onwards: presbyopia is loss of accommodation, around 40 - you may need reading glasses. Myopia - focal point falls in front of retina: or near sightedness, corrected with a concave lens. Hyperopia - focal point falls behind retina: far-sightedness, corrected with a convex lens. Retina is a sensory organ, develops from neural tissues. 5 types of neurons in layers on top of pigment epithelial layer: the neurons that get the light are the furthest back. Optic disk has no photoreceptors and is called the blind spot. Fovea and macula - most acute vision: where optic nerve leaves. Figure 10. 29: retinal photoreceptors are organized into layers. Neurons where signals and cones are integrated. Rods and cones detect the light - but they are at the back, then go forward again to the bipolar neuron, then the ganglion cell, whose axons make the optic nerve. Amacrine cells - between cones and ods and bipolar cells.
