医学英语视听说（第二版）卢凤香-unit 11.pptxVIP

医学英语视听说(第二版)Unit Eleven Eye and EarMedical English Communication: Listening and Speaking (2nd edition)1 ContentsPart I Introduction to the Eye and the Ear Part II Diseases Related to the Eye and the Ear Part III Celebrity and DiseasePart IV Medical Terminology Related to the Eye and the Ear 2Part V Further Thinking Part IVideo: Introduction to the Eye and the Ear 3 Part IIntroduction to the Eye and the Ear Video OneHow Your Eyes Make Sense of the World Video TwoHow the Ear Works Video OneVideo Two4 Video OneHow Your Eyes Make Sense of the World 5 Think and Talk The visual system includes the eyes, the connecting pathways through to the visual cortex and other parts of the brain. Light entering the eye is?refracted?as it passes through the?cornea. It then passes through the?pupil?(controlled by the?iris) and is further refracted by the?lens. The cornea and lens act together as a compound lens to project an inverted image onto the retina. The eye ball, or the eye is not shaped like a perfect sphere, rather it is a two-piece unit, composed of an?anterior segment and the posterior segment.?Light energy enters the eye through the cornea, through the pupil and then through the lens. The lens shape is changed for near focus (accommodation) and is controlled by the ciliary muscle.?Reference6 Task One: Blank Fillingperceive pupil iris stretch retina density Watch and Do(7) peripheral (8) refocusing (9) Pixels (10) prompt (11) seamless 7Part I-Video One Task Two: Questions and AnswersOur eyes are constantly refocusing on what we want to see, like a high-resolution spotlight. When stimulated, the rods and cones send signals to the optic nerve and back to the brain.3. The brain fills in those gaps created by the blinks.Watch and Do8Part I-Video One Task Three: Summary We often compare our eyes to cameras, but they actually work quite differently. Our peripheral vision is very low resolution. But we barely notice it because our eyes are con